ACE&EASTMAN He 800B Service Manual User

2016-10-16

User Manual: ACE&EASTMAN He-800B Service Manual

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HE-800B

SERVICE MANUAL

Please read this manual before making any adjustments.

ELECTRONIC DIRECT DRIVE LOCKSTITCH BUTTON HOLER

This service manual is intended for HE-800B; be sure to read the HE-800B instruction manual before this manual.
Carefully read the “SAFETY INSTRUCTIONS” below and the whole of this manual to understand this product before you
start maintenance.
As a result of research and improvements regarding this product, some details of this manual may not be the same as those
for the product you purchased.
If you have any questions regarding this product, please contact a Brother dealer.

HE-800B

SAFETY INSTRUCTIONS
[1] Safety indications and their meanings

This service manual and the indications and symbols that are used on the machine itself are provided in order to ensure
safe operation of this machine and to prevent accidents and injury to yourself or other people.
The meanings of these indications and symbols are given below.

Indications

DANGER

The instructions which follow this term indicate situations where failure to follow the
instructions will result in death or serious injury.

WARNING

The instructions which follow this term indicate situations where failure to follow the
instructions could result in death or serious injury.

CAUTION

The instructions which follow this term indicate situations where failure to follow the
instructions may result in minor or moderate injury.

Symbols

･･････

This symbol (
) indicates something that you should be careful of. The picture inside the triangle
indicates the nature of the caution that must be taken.
(For example, the symbol at left means “beware of injury”.)

･･････

This symbol (

･･････

This symbol ( ) indicates something that you must do. The picture inside the circle indicates the
nature of the thing that must be done.
(For example, the symbol at left means “you must make the ground connection”.)

) indicates something that you must not do.

HE-800B

[2] Notes on safety

DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the control box cover. Touching areas where high voltages are present will result in serious injury
from electric shocks.

WARNING
Do not allow any liquids to get onto this sewing machine, otherwise fire, electric shocks or operating problems may
occur.
If any liquid gets inside the sewing machine (machine head or control box), immediately turn off the power and
disconnect the power plug from the electrical outlet, and then contact the place of purchase or a qualified
technician.

CAUTION
Environmental requirements
Use the sewing machine in an area which is free from
sources of strong electrical noise such as electrical
line noise or static electric noise.
Sources of strong electrical noise may cause
problems with correct operation.
Any fluctuations in the power supply voltage should
be within ±10% of the rated voltage for the machine.
Voltage fluctuations which are greater than this may
cause problems with correct operation.
The power supply capacity should be greater than the
requirements for the sewing machine’s power
consumption.
Insufficient power supply capacity may cause
problems with correct operation.

The ambient temperature should be within the range
of 5°C to 35°C during use.
Temperatures which are lower or higher than this
may cause problems with correct operation.
The relative humidity should be within the range of
45% to 85% during use, and no dew formation should
occur in any devices.
Excessively dry or humid environments and dew
formation may cause problems with correct operation.
In the event of an electrical storm, turn off the power
and disconnect the power cord from the wall outlet.
Lightning may cause problems with correct operation.

Installation
Machine installation should only be carried out by a
qualified technician.
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
The sewing machine weighs approximately 56 kg.
The installation should be carried out by two or more
people.
Do not connect the power cord until installation is
complete, otherwise the machine may operate if the
treadle is depressed by mistake, which could result in
injury.
Use both hands to hold the machine head when tilting
it back or returning it to its original position. If only
one hand is used, the weight of the machine head
may cause your hand to slip, and your hand may get
caught.
Be sure to connect the ground. If the ground
connection is not secure, you run a high risk of
receiving a serious electric shock, and problems with
correct operation may also occur.

HE-800B

All cords should be secured at least 25 mm away
from any moving parts. Furthermore, do not
excessively bend the cords or secure them too firmly
with staples, otherwise there is the danger that fire or
electric shocks could occur.
Install the safety covers to the machine head and
motor.
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they
do not get into your eyes or onto your skin, otherwise
inflammation can result.
Furthermore, do not drink the oil or eat the grease
under any circumstances, as they can cause vomiting
and diarrhea.
Keep the oil out of the reach of children.

CAUTION
Sewing
This sewing machine should only be used by
operators who have received the necessary training
in safe use beforehand.

If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.

The sewing machine should not be used for any
applications other than sewing.

Attach all safety devices before using the sewing
machine. If the machine is used without these
devices attached, injury may result.

Be sure to wear protective goggles when using the
machine.
If goggles are not worn, there is the danger that if a
needle breaks, parts of the broken needle may enter
your eyes and injury may result.
Turn off the power switch at the following times,
otherwise the machine may operate if the treadle is
depressed by mistake, which could result in injury.
• When replacing the needle and bobbin
• When not using the machine and when leaving the
machine unattended

Do not touch any of the moving parts or press any
objects against the machine while sewing, as this
may result in personal injury or damage to the
machine.
If an error occurs in machine operation, or if abnormal
noises or smells are noticed, immediately turn off the
power switch. Then contact your nearest Brother
dealer or a qualified technician.
If the machine develops a problem, contact your
nearest Brother dealer or a qualified technician.

Use threading mode or turn off the power first in order
to carry out threading.

Cleaning
Turn off the power switch before carrying out
cleaning, otherwise the machine may operate if the
treadle is depressed by mistake, which could result in
injury.

Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they
do not get into your eyes or onto your skin, otherwise
inflammation can result.
Furthermore, do not drink the oil or eat the grease
under any circumstances, as they can cause vomiting
and diarrhea.
Keep the oil out of the reach of children.

Maintenance and inspection
Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
otherwise the machine may operate if the treadle is
depressed by mistake, which could result in injury.
• When carrying out inspection, adjustment and
maintenance
• When replacing consumable parts such as the
rotary hook
Turn off the power switch before inserting or
removing the plug, otherwise damage to the control
box could result.
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to observe
all safety precautions.

HE-800B

Use both hands to hold the machine head when tilting
it back or returning it to its original position. If only
one hand is used, the weight of the machine head
may cause your hand to slip, and your hand may get
caught.
When replacing parts and installing optional
accessories, be sure to use only genuine Brother
parts.
Brother will not be held responsible for any accidents
or problems resulting from the use of non-genuine
parts.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly before
using the machine.
To prevent accidents and problems, do not modify
the machine yourself.
Brother will not be held responsible for any accidents
or problems resulting from modifications made to the
machine.

iii

[3] Warning labels
The following warning labels appear on the sewing machine.
Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or
are difficult to read, please contact your nearest Brother dealer.

*Safety devices
(A) Eye guard
(B) Finger guard
(C) Thread take-up cover
(D) Motor cover
(E) Slide cover

Be careful to avoid injury from the moving thread
take-up.

Be careful not to get your hands caught when returning
the machine head to its original position after it has
been tilted.

Be careful to avoid injury from the moving cutter.

Be sure to connect the ground. If the ground connection
is not secure, you run a high risk of receiving a serious
electric shock, and problems with correct operation may
also occur.

HE-800B

4730M

Oil tank
(accessory)

4731M

4732M

HE-800B

CONTENTS
1. SPECIFICATIONS ................................. 1

6. ASSEMBLY .......................................... 49

1-1. Specifications .......................................................... 1
1-2. Standard sewing pattern list .................................... 2

6-1. Lower shaft and idle pulley mechanisms ............. 50
6-2. Lower thread trimmer mechanism ....................... 52
6-3. Feed mechanism ................................................. 54
6-4. Threading mechanism ......................................... 57
6-5. Presser lifter mechanism ..................................... 59
6-6. Needle zigzag mechanism................................... 62
6-7. Cutter mechanism ............................................... 64
6-8. Upper shaft and tension pulley mechanisms ....... 67
6-9. Lubrication mechanism ........................................ 69
6-10. Needle bar and thread take-up mechanisms ..... 75
6-11. Presser bar mechanism .................................... 77
6-12. Upper thread trimmer mechanism ..................... 79
6-13. Thread breakage detector mechanism .............. 80
6-14. Rotary hook mechanism.................................... 81
6-15. Covers ............................................................... 82

2. NOTES ON HANDLING ......................... 3
3. FUNCTION SETTINGS .......................... 4
3-1. List of special functions when power is turned

on ........................................................................... 4

3-2. List of advanced functions ..................................... 6
3-3. Setting memory switches (Advanced) .................... 7
3-4. List of memory switches......................................... 8
3-5. Pedal operation mode setting method ................. 14
3-6. Checking the error history .................................... 16
3-7. Input checking method ......................................... 17
3-8. Output checking method ...................................... 20
3-9. Confirming software version................................. 22
3-10. Protection settings ............................................. 23

7. ADJUSTMENT ...................................... 83

4. USING SD CARDS .............................. 26

7-1. Notes on making adjustments ............................. 83
7-2. Adjusting the home position................................. 84

4-1. Notes on handling SD cards

(commercially available) ...................................... 26

7-2-1. Switching to home position adjustment
mode............................................................. 84

4-2. Structure of an SD card folder.............................. 26
4-3. Preparation for reading and writing data .............. 27
4-4. Reading program data (parameters) .................... 28
4-5. Writing program data (parameters) to an SD

7-2-2. Needle zigzag (X) motor home position ........ 85
7-2-3. Feed (Y) motor home position....................... 86
7-2-4. Work clamp (P) motor home position ............ 87

memory card ........................................................ 29

7-3. Adjusting the needle bar height ........................... 88
7-4. Adjusting the needle and hook timing .................. 89

4-6. Reading memory switch data ............................... 30
4-7. Writing memory switch data to the SD card ......... 31
4-8. Reading sewing machine data ............................. 32
4-9. Writing sewing machine data to an SD card ........ 33
4-10. Writing error log data to an SD card .................. 34
4-11. Updating the control program version ................ 35

7-4-1. Adjusting the clearance between needle
and hook tip .................................................. 91

7-5. Adjusting the inner rotary hook and rotary hook

holder overlap...................................................... 91

7-6. Adjusting the work clamp pressure ...................... 91
7-7. Adjusting the work clamp lift amount ................... 92
7-8. Adjusting the work clamp lateral position ............. 93
7-9. Adjusting the cutter home position sensor

5. MECHANICAL DESCRIPTIONS ......... 36
5-1. Needle bar and thread take-up mechanisms ....... 36
5-2. Upper shaft, lower shaft and rotary hook

position ................................................................ 93

mechanisms......................................................... 37

7-10. Adjusting the cutter installation position............. 94

5-3. Needle zigzag mechanism ................................... 38
5-4. Presser foot lifter mechanism............................... 39
5-5. Feed mechanism ................................................. 40
5-6. Cutter mechanism ................................................ 40
5-7. Thread breakage detection mechanism ............... 41
5-8. Tension release mechanism ................................ 42
5-9. Upper thread trimmer mechanism........................ 43

7-10-1. When using the special needle plate
(needle plate -RB) ..................................... 95

7-11. Adjusting the cutter installation height ............... 95
7-12. Adjusting the upper thread trimming.................. 96
7-12-1. Adjusting the longitudinal feed arm
assembly position ....................................... 97
7-12-2. Adjusting the trimmer driving arm
assembly position ....................................... 97

5-9-1. Upper thread scissors Gradually opens ...... 45
5-9-2. Upper thread scissors Open ....................... 46

7-12-3. Adjusting the lateral position of the upper
thread scissors at the sewing start .............. 98

5-10. Lower thread trimmer mechanism ...................... 47

7-12-4. Adjusting the longitudinal position of the
upper thread scissors.................................. 98

5-10-1. Lower thread clamp open at the sewing start
Open ················································ 48
HE-800B

7-12-5. Adjusting the cutting depth of the upper
thread scissors ............................................ 99

11-6. Uneven seams (4)……Uneven sewing pitch at

7-12-6. Adjusting the installation height of the
upper thread scissors ................................ 100

11-7. Uneven seams (5)……Poor rounding of seam 153
11-8. Uneven seams (6)……Around rear tack or

the sewing start ............................................... 153

front tack.......................................................... 153

7-12-7. Adjusting the upper thread scissors
gradual opening timing .............................. 101

11-9. Uneven seams (7)……Loose thread end at

end backtack ................................................... 153

7-12-8. Adjusting the upper thread scissors
opening timing ........................................... 102

11-10. Uneven seams (8)……Thread sticking out at

end backtack................................................. 154

7-12-9. Adjusting the overlapping amount of the
upper thread scissors and the work clamp 103

11-11. Uneven seams (9)……Sticking in needle

7-13. Adjusting the lower thread trimming................. 104

plate .............................................................. 154

11-12. Uneven seams (10)……All stitches............... 155
11-13. Upper thread run out ..................................... 156
11-14. Unraveling of thread trimmed by upper

7-13-1. Adjusting the lower thread trimmer fixed
knife engagement amount ......................... 104
7-13-2. Adjusting the lower thread retaining
amount ...................................................... 104

thread trimmer assembly .............................. 158

7-13-3. Adjusting the lower thread clamp opening
timing ........................................................ 105

11-15. Upper thread miss-trimming .......................... 159
11-16. Needle strikes upper thread trimmer ............. 160
11-17. Needle breakage ........................................... 161
11-18. Imperfect cutter function (imperfect material

7-13-4. Adjusting the lower thread clamp opening
amount ...................................................... 106

7-14. Adjusting the bobbin presser ........................... 106
7-15. Adjusting the thread breakage detector ........... 107
7-16. Adjusting the thread tension at the tack

cutting) .......................................................... 162

11-19. Cutter does not return ................................... 162
11-20. Cutter and upper thread trimmer touch ......... 163
11-21. Seam is cut ................................................... 163
11-22. Upper thread miss-winding............................ 164
11-23. Work clamp is not raised (1)……Error does

tension control ................................................. 108

7-17. Adjusting the thread tension at the zigzag

tension control ................................................. 108

7-18. Adjusting the upper thread feeding amount ..... 109
7-19. Adjusting the rotary hook lubrication ................ 109
7-20. Adjusting the upper shaft motor reference

not occur. ...................................................... 164

11-24. Work clamp is not raised (2)……Error occurs.

...................................................................... 165

position ............................................................ 110

11-25. Lower thread is not trimmed (pulls when

7-21. Standard settings for treadle depression

material is removed) ..................................... 166

stroke ............................................................... 111

11-26. Feed mechanism does not move and error

occurs. .......................................................... 166

8. INSTALLING THE 3-PEDAL FOOT
SWITCH (OPTION) ............................. 112

11-27. Needle does not zigzag or noise occurs

when needle zigzags .................................... 167

9. ELECTRIC MECHANISM ................... 113

11-28. Sewing machine stops during sewing ........... 167
11-29. Upper shaft does not rotate as far as the

9-1. Precautions at the time of adjustment ................ 113
9-2. Components inside and outside the control box

needle up stop position ................................. 167

and in the operation panel ................................. 114

11-30. Operation panel display freezes and

9-3. Fuse explanation................................................ 115
9-4. Connectors......................................................... 116

operation is not possible ............................... 167

9-4-1. Connector positions..................................... 116
9-4-2. Contact failure ............................................. 118

9-5. Troubleshooting ................................................. 123
9-5-1. Troubleshooting flowchart ........................... 123
9-5-2. Problem solution and measures .................. 127

10. TABLE OF ERROR CODES ............. 142
11. TROUBLESHOOTING ...................... 148
11-1. Upper thread breakage .................................... 148
11-2. Skipped stitches............................................... 149
11-3. Uneven seams (1)……At the sewing start ....... 151
11-4. Uneven seams (2)……Lower thread is lifted
up at the sewing start....................................... 152

11-5. Uneven seams (3)……Seam lifts up at the

sewing start...................................................... 152
HE-800B

1. SPECIFICATIONS

1. SPECIFICATIONS
1-1. Specifications

4734M

Main use

Buttonhole size
A

Buttonholes for clothing such as dress shirts,
blouses, work clothes and women's clothes

2193Q

2
C

Buttonholes for knitted garments such as
knitted underwear, sweaters, cardigans and
jerseys

A: Max.6 mm
B: Max. zigzag stitch length 36 mm
C: Length of the hole 4 – 32 mm
D: Max. buttonhole length 40 mm

Max. sewing speed
Zigzag mechanism

4,000 sti/min
Pulse motor driven mechanism

Feed mechanism

Pulse motor driven mechanism

Work clamp lifter mechanism

Pulse motor driven mechanism

Height of work clamp

13 mm max. (adjustable)

Cutter drive method

Double position solenoid

Lower thread holding device

Standard equipment

Bobbin presser

Standard equipment

Standard sewing pattern

Memory pattern

Max. number of stitch
Needle
Data recording media
Power supply

999 stitches / program

(Overall cycle program stitch no. 3,000 stitches)

-2

-3

Schmetz 134 Nm90
Schmetz 134 Nm75
SD memory card (No guarantees of operation can be given for any media.)
Single-phase 100V / 220V, 3-phase 220V / 380V / 400V
(For single-phase 100 V and three-phase 380 V/400 V, the trans box is required.)

HE-800B

1. SPECIFICATIONS

1-2. Standard sewing pattern list
Rectangle

Radial

Round

Straight bar tack

Rear tack

Front tack

Radial-rectangle

Round-rectangle

Eyelet-rectangle

Rectangle-radial

Round-radial

Eyelet-radial

Rectangle-round

Radial-round

Eyelet-round

Rectangle-taper tack

Radial-taper tack

Round-taper tack

Eyelet-taper tack

Rectangle-tack

Radial-tack

Round-tack

Eyelet-tack

HE-800B

2. NOTES ON HANDLING

2. NOTES ON HANDLING
About the machine set-up location
・ Do not set up this sewing machine near other equipment
such as televisions, radios or cordless telephones,
otherwise such equipment may be affected by electronic
interference from the sewing machine.
・ The sewing machine should be plugged directly into an AC wall
outlet. Operation problems may result if extension cords are
used.

2516B

Carrying the machine
・ The machine should be carried by the arm by two people as
shown in the illustration.

0597B

Tilting back the machine head
1. Pack away any tools which are near the table.
2. Secure the foot (A) so that the table will not move, and then pull
the arm with both hands to tilt back the machine head.
* While supporting the arm with both hands, gently lower it.

0598D

Returning the machine head to the upright position
1. Pack away any tools which are near the table.
2. While supporting the arm with both hands, gently return the
machine head to its original position.

0599D

HE-800B

3. FUNCTION SETTINGS

3. FUNCTION SETTINGS
3-1. List of special functions when power is turned on
This list shows the key operations for using special functions.
2593B

0600D

Data initialization function

Output check function

0601D

Refer to the CD Instruction Manual.
Memory switch setting mode (Advanced)

0604D

Refer to “3-8. Output checking method”.
Software version display function

0602D

0605D

Refer to “3-3. Setting memory switches (Advanced)”.

Refer to “3-9. Confirming software version”.

Input check function

0603D

Refer to “3-7. Input checking method”.
HE-800B

Error log display function

0606D

Refer to “3-6. Checking the error history”.

3. FUNCTION SETTINGS

Home position adjusting mode

Protect setting mode

0610D

0607D

Refer to “7-2. Adjusting the home position”.
Treadle position adjustment mode

Version update

0608D

0611D

Refer to “7-22. Standard settings for treadle
depression stroke”.

Refer to “4-11. Updating the control program version”.

Upper shaft motor standard position
adjustment mode

0609D

Refer to “7-20. Adjusting the upper shaft motor
reference position”.

Refer to “3-10. Protection settings”.

HE-800B

3. FUNCTION SETTINGS

3-2. List of advanced functions
This list shows the key operations for using advanced functions.

0612D

Lower thread counter setting mode

0613D

Refer to the CD Instruction Manual.

HE-800B

Production counter setting mode

0614D

Refer to the CD Instruction Manual.

3. FUNCTION SETTINGS

3-3. Setting memory switches (Advanced)
The settings for the memory switches are valid for all programs.
Refer to “3-4. List of memory switch” for details on memory switch Nos. and settings.

While pressing the TEST and MEMSW keys, turn on the power switch.

(1) Memory switch number
(2) Setting for selected number
(3) Setting range

0615D

5
6

Select the memory switch (1) that you would like to change the setting for.

4787M

4924M

Change the setting value (3).

4925M

4792M

• When the setting value is changed, (3) will start flashing.
• If you would like to return the setting to the default value,
press the RESET key.
4925M

Apply the changed setting.

4794M

The setting for the memory switch will be stored and (3) will
stop flashing and illuminate steadily.

To change the settings for other memory switch Nos., repeat the operations in steps 2 to 4 above.
4917M

Press the TEST key to exit memory switch mode.
Flashing

4857M

4923M

Normal sewing machine operation will then be possible.

HE-800B

3. FUNCTION SETTINGS

3-4. List of memory switches
NOTE:
In standard memory switch setting mode (refer to the CD instruction manual), the bottom two digits only display memory
switch Nos. 00 to 49.
To make the bottom two digits display memory switch Nos. 50 to 99, switch the sewing machine to Administrator memory
switch setting mode. (Refer to the previous page.)
Work clamp setting (001 to 099)
No.
001
002

Setting items
Work clamp height when treadle is depressed.

Default value

1 to 13

1 to 2

0.1 to 8.0

1.0

1,3

ON/OFF

OFF

1 to 8

Settings can be made in units of 1 mm.
Work clamp height when treadle is at neutral position.
Settings can be made in units of 1 mm.
Work clamp operation when treadle is depressed to the 1st step.

003

Setting range

* When using a triple pedal (optional part), this number will not be
displayed.
1: Work clamp does not drop to intermediate position.
2: Work clamp drops to intermediate position.
Work clamp height (mm) when dropped to intermediate position.

004

* Displayed when No. 003 above is set to “2”.
Settings can be made in units of 0.1 mm.

050
*1

Sewing machine starting procedure (pedal type).
1: Treadle.
3: Triple pedal.
Pausing enabled during automatic sewing when treadle is depressed backward.

052

* When using a triple pedal (optional part), this number will not be
displayed.
OFF: Pausing is not allowed.
ON: Pausing is allowed.
Work clamp operation when using a triple pedal.
* When using a treadle, this number will not be displayed. (Refer to P. 15.)
* Neutral indicates that the work clamp is at the neutral position.

053

1: Remains lowered even when the work clamp switch is released, intermediate
lowering disabled, and starting prohibited when at neutral.
2: Remains lowered even when the work clamp switch is released, intermediate
lowering enabled, and starting prohibited when at neutral.
3: Remains lowered even when the work clamp switch is released, intermediate
lowering disabled, and starting allowed when at neutral.
4: Remains lowered even when the work clamp switch is released, intermediate
lowering enabled, and starting allowed when at neutral.
5: Returns to neutral when the work clamp switch is released, intermediate
lowering disabled, and starting prohibited when at neutral.
6: Returns to neutral when the work clamp switch is released, intermediate
lowering enabled, and starting prohibited when at neutral.
7: Returns to neutral when the work clamp switch is released, intermediate
lowering disabled, and starting allowed when at neutral.
8: Returns to neutral when the work clamp switch is released, intermediate
lowering enabled, and starting allowed when at neutral.

*1 This is not initialized during initialization mode. Also not overwritten from SD card.

HE-800B

3. FUNCTION SETTINGS

No.

Setting items
Work clamp operation after automatic sewing is finished.

055

-4 to 4

-: Dropping speed becomes slower.
+: Dropping speed becomes faster.
Thread trimming speed.

062

ON/OFF

-: Lifting speed becomes slower.
+: Lifting speed becomes faster.
Work clamp lowering speed.

061

Default value

OFF: Work clamp remains lowered after automatic sewing is finished.
To raise the work clamp, carry out the following operations.
(A) For treadle: Depress the treadle backward.
(B) For triple pedal: Press the work clamp lifter switch.
ON: Work clamp remains raised after automatic sewing is finished.
Work clamp lifting speed.

060

Setting range

-: Thread trimming speed becomes slower.
+: Thread trimming speed becomes faster.

Sewing machine motor settings (100 to 199)
No.

Setting items
Automatic needle lifter operation ON/OFF.

150

Setting can be carried out in units of 1°.
-: Stopping position becomes earlier.
+: Stopping position becomes later.

Default value

ON/OFF

-7 to 7

OFF: If the pulley is at the needle up stop position during needle bar and work
clamp home position detection, a needle up error will be generated.
ON: If the pulley is not at the needle up stop position during needle bar and
work clamp home position detection, it will move automatically to the
needle up stop position, and then home position detection will be carried
out.
Needle up stop position correction.

151

Setting range

HE-800B

3. FUNCTION SETTINGS
Feed mechanism (200 to 299)
No.

Setting items

Setting range

Automatic upper shaft deceleration to emphasize feeding.
250

Default value

ON/OFF

OFF

-20 to 20

1 to 2

OFF: Normal.
ON: The proportional feed time for each stitch is reduced from normal in
order to prevent needle deflection with heavy materials.
* This may limit the upper shaft speed.
Feed timing correction.

251

Setting can be carried out in units of 1°.
-: Feed timing is advanced in relation to the upper shaft phase.
+: Feed timing is retarded in relation to the upper shaft phase.

252
*1

Home position detection method after power is turned on.
1: Home position detection is carried out by pedal operation.
2: Home position detection is carried out by pressing the RESET key.

*1 This is not initialized during initialization mode. Also not overwritten from SD card.

Operation panel settings (300 to 399)
No.

Setting items

Setting range

Parameter number assignment for FUNC key.

300

301

Default value

OFF, 1 to 60 OFF

Functions can be assigned to the FUNC key to make it operate as a seventh
shortcut key.
OFF: No assignment.
(The help screen is displayed while the FUNC key is pressed.)
1 to 60: When the FUNC key is pressed, the parameter setting screen for the
number which has been set is displayed.
Display screen contrast.
You can change the degree of contrast.
The higher the number, the stronger the contrast.

1 to 15

Counter display during automatic sewing mode.

1 to 2

ON/OFF

OFF

The contents appearing at (1) in the display during automatic sewing mode
can be set to either the lower thread counter display or the production counter
display.
302

1: Lower thread counter
2: Production counter

4926M

Production counter operation by cycle sewing units during cycle sewing.
350

OFF: Counts in units of individual programs (1 hole).
ON: Counts in units of individual cycle programs.

HE-800B

3. FUNCTION SETTINGS
User program settings (400 to 499)
No.

Setting items
Maximum sewing speed.

450

Setting range

Default value

1000 to 4000 4000

Setting can be carried out in units of 100 (sti/min).
* When setting the sewing speed, the speed will be limited by this value.
Maximum number of cycle programs.

451

0 to 9

This lets you set the number of cycle programs that can be used.
* If you do not want cycle programs to be displayed, set to “0”.

Device settings (500 to 599)
No.
550

Setting items
Cutter power.

ON/OFF

OFF

ON/OFF

1 to 10

2 to 7

* Displayed when No. 554 above is set to “ON”.
Upper thread breakage detection starts after the set number of stitches has
been sewn.
Number of stitches for upper thread breakage judgment.

556

ON/OFF

OFF: Thread breakage detector is not used.
ON: Thread breakage detector is used.
Number of stitches before upper thread breakage is detected.

555

OFF: Upper thread is not tightened.
ON: Upper thread is tightened.
Using the thread breakage detector.

554

1 to 6

OFF: Error checking is not carried out (emergency measures when there is a
sensor problem).
ON: Error checking enabled.
Upper thread tightening when sewing underlays.

552

Default value

The larger the value, the stronger the cutting force.
Cutter home position error checking.

551

Setting range

* Displayed when No. 554 above is set to “ON”.
An upper thread breakage error occurs when the upper thread breakage
signal is continuously ON for the set number of stitches.

HE-800B

3. FUNCTION SETTINGS
Error processing settings (600 to 699)
No.

Setting items

Setting range

Time from error occurring to buzzer stopping.
650

651

652

Default value

OFF, 2 to 30 OFF

OFF: Buzzer does not stop.
2 to 30: Buzzer stops after the specified time (set in units of 2 seconds).
Needle zigzag and feed motor energization status when a non-resettable error ON/OFF
occurs.

OFF

OFF: Needle zigzag and feed motor energization is turned off.
ON: Needle zigzag and feed motor energization remains on.
Needle zigzag motor status when a pause or thread breakage occurs during ON/OFF
automatic sewing.

OFF: Needle zigzag motor energization is turned off.
ON: Needle zigzag motor energization remains on.

Maintenance settings (700 to 799)
No.

700

Setting items
Y cutting position (feed direction) correction.
The cutter position for the sewing pattern can be
corrected in the Y (feed) direction.
Settings can be made in units of 0.025 mm.
When + is selected, the cutting position moves
further to the back.

Setting range

Default value

-0.800 to
0.800

ON/OFF

OFF

0 to 2500

1000

Sewing machine ID code (for specifying SD card folder)

0 to 99

Thread winding speed limit.

ON/OFF

Back

Forward
1445Q

Continuous sewing permission (for administrator).

750

OFF: Disabled (Continuous sewing forbidden).
ON: Sewing operation is repeated while the treadle is being depressed to
2nd step.
NOTE:
This setting is test operation mode for use by an administrator.
It is dangerous to set it to ON while sewing, so be sure to set it back to
OFF after use.
Continuous sewing interval (for administrator).

751

* Displayed when No. 750 above is set to “ON”.
Setting can be carried out in units of 100 ms.

752

OFF: Upper limit is not limited to 2000 sti/min.
* Thread winding is carried out at the speed specified at the operation panel.
755

ON: Upper limit is limited to 2000 sti/min.
* If the speed specified at the operation panel exceeds 2000 sti/min, thread
winding will be limited to 2000 sti/min.

HE-800B

3. FUNCTION SETTINGS
Specification and destination settings (800 to 899)
No.

Setting items

Setting range

Machine head specifications
850
*1

851
*1

Sewing area
1: 4.0 x 15.0mm
2: 4.0 x 20.0mm
3: 4.0 x 32.0mm
4: 5.4 x 20.0mm
5: 5.4 x 32.0mm
6: 5.4 x 40.0mm
7: 6.0 x 20.0mm
8: 6.0 x 32.0mm
9: 6.0 x 40.0mm

1 to 9

4,6

-2 specifications:
6
-3 specifications:
4
*2

0 to 2

China: 2
Europe: 0
Other: 0
*3

4: 4mm(5.4mm)
6: 6mm(7.3mm)
Language

853
*1

-2 specifications:
2
-3 specifications:
3
*2

Work clamp size
5.4 x 19.0mm
5.4 x 24.5mm
5.4 x 36.0mm
6.8 x 24.5mm
6.8 x 36.0mm
6.8 x 47.0mm
7.3 x 24.5mm
7.3 x 36.0mm
7.3 x 47.0mm

Max. needle zigzag feed width(Needle plate size) *4
852
*1

2,3

2: -2 specifications (for cotton and silk)
3: -3 specifications (for knitted materials)
Sewing area(Work clamp size) *4

Default value

0: English
1: Japanese
2: Chinese

*1 This is not initialized during initialization mode. Also not overwritten from SD card.
*2 The initial value is determined by the machine head specifications at the time of shipment from the factory.
*3 The initial value is determined by the shipping destination at the time of shipment from the factory.
*4 The actual sewing area is determined by the work clamp dimensions and the needle plate dimensions.
Needle plate size

Work clamp size
(Width x Length)

5.4mm

7.3mm

5.4 x 19.0mm

4.0 x 15.0mm

5.4 x 24.5mm

4.0 x 20.0mm

5.4 x 36.0mm

4.0 x 32.0mm

6.8 x 24.5mm

4.0 x 20.0mm

5.4 x 20.0mm

6.8 x 36.0mm

4.0 x 32.0mm

5.4 x 32.0mm

6.8 x 47.0mm

4.0 x 40.0mm

5.4 x 40.0mm

7.3 x 24.5mm

4.0 x 20.0mm

6.0 x 20.0mm

7.3 x 36.0mm

4.0 x 32.0mm

6.0 x 32.0mm

7.3 x 47.0mm

4.0 x 40.0mm

6.0 x 40.0mm

HE-800B

3. FUNCTION SETTINGS

3-5. Pedal operation mode setting method
When using the treadle
The following table describes the operation of the work clamp during sewing standby mode when using the treadle.
Depressed
Neutral
1st step
2nd step

1. Set memory switch No. 050 to “1”.
2. Use memory switch No. 003 to select the desired operation mode from the following.
Treadle
Depressed
Neutral

Neutral

1st step

Setting
value
No.003

2nd step
0796D

Depressed
backward

Release
Depress
backward

Depres

Neutral

1st step

Work clamp
raised

Work clamp
neutral
position

Work clamp
maximum
drop

Work clamp
raised

Work clamp
neutral
position

Work clamp
intermediate
drop

Insertion and removal of the
material

Normal position

2nd step

Depressed
further

Releas

Buttonhole positioning

Sewing
machine
start
Work clamp
maximum drop
+ sewing
machine start

Sewing

After sewing

Raised

Neutral

Intermediate drop

HE-800B

Maximum drop

3. FUNCTION SETTINGS

When using a triple pedal (option)
The following table describes the operation of the work clamp during sewing standby mode when using a triple pedal.

Work clamp lifter switch
Work clamp switch
Start switch

0770D

1. Set memory switch No. 050 to “3”.
2. Use memory switch No. 053 to select the desired operation mode from the following.
Setting
value
No. 053

Work clamp
lifter switch

Work clamp
lifts

Release →
← Depress

All switches OFF

Depress →
← Release

Work clamp switch

Start switch

Work clamp
neutral position

Work clamp
maximum drop

Work clamp neutral
position

Work clamp
neutral position

Work clamp
intermediate drop

Work clamp neutral
position

Work clamp
neutral position

Work clamp
maximum drop

Work clamp neutral
position

Work clamp
neutral position

Work clamp
intermediate drop

Work clamp neutral
position

Work clamp maximum
drop
＋
Sewing
machine starts

Work clamp
neutral position

Work clamp
maximum drop

Sewing
machine starts

Work clamp
intermediate drop

Work clamp maximum
drop
＋
Sewing
machine starts

Work clamp
maximum drop

(Work clamp
maximum drop)
＋
Sewing
machine starts

Work clamp
intermediate drop

Work clamp maximum
drop
＋
Sewing
machine starts

Work clamp
neutral position

Sewing
machine starts
Work clamp maximum
drop
＋
Sewing
machine starts
(Work clamp
maximum drop)
＋
Sewing
machine starts

* The start switch is enabled at statuses indicated by

HE-800B

3. FUNCTION SETTINGS

3-6. Checking the error history
The past error history can be checked by the following procedure.

0618D

key (1), turn on the power switch.
1. While pressing the
Error history numbers, error codes and production counter values (lower 6 digits) will be displayed on the screen.
NOTE:
E025, E035, E045, E065, E705 and error codes which can be reset do not remain in the error history, and so they will
not be displayed.
or
key (2) to switch the error history sequentially.
2. Press the
Up to 96 histories (01 to 96) are stored in order starting from the newest. No. 01 represents the newest error.
(If there are no error codes, “E---” will be displayed.)
While the FUNC key (3) is being pressed, the error codes will be removed from the display and the production counter
when the error occurred will be displayed as 10 digits.
3. Press the TEST key (4) to return to the normal display. The sewing machine will switch to home position detection
standby.

HE-800B

3. FUNCTION SETTINGS

3-7. Input checking method
This is used at the following times.
・ When you would like to check for problems with the operation panel.
・ When you would like to check for broken cords.
・ When you would like to adjust a sensor position.
This lets you check if the CPU is reading signals from the keys and the sensors correctly.

0799D

1. While pressing the
key (1), turn on the power switch.
Item numbers, item names and input statuses will be displayed on the screen.
key (1) or the
key (2) to select the desired item number.
2. Press the
3. Refer to the input check list to check the key and sensor responses.
4. When returning to normal operation, turn power off and then on again.

HE-800B

3. FUNCTION SETTINGS

Item No.
1

Input status
***

ON/OFF

***

ON/OFF

Check item and checking method
Shows the input voltage.
X (needle zigzag) axis motor home position sensor position.
Move the needle bar manually.
Turns ON when moved to the left.
X (needle zigzag) axis motor encoder counter value.
Move the needle bar manually.
Goes down when moved to the left.
* When the power is turned on, the position will be “0”.
Y (feed) axis motor home position sensor position.
Move the feed arm (1) manually.

Turns on when moved to the inside.
Y (feed) axis motor encoder counter value.
Move the feed arm (1) manually.

0771D

***
0771D

Goes down when moved to the inside.
* When the power is turned on, the position will be “0”.
Work clamp motor home position sensor position.
Move the trimmer driving arm (1) manually.

ON/OFF

1770B

Turns on when moved in the direction of the arrow.
Work clamp motor encoder counter value.
Move the trimmer driving arm (1) manually.

***

1770B

0 to 255

Goes down when moved in the direction of the arrow.
* When the power is turned on, the position will be “0”.
Treadle analog value.
Depress the treadle.
When depressed forward, the value increases.
* Should normally display somewhere around 109 when at the neutral position.

HE-800B

3. FUNCTION SETTINGS

ON/OFF

0 to 359

21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
42
43
44
45
46
47
48
49
50

ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF

Work clamp lifter switch.
Turns on when the work clamp lifter switch of the triple pedal (option) is pressed.
Work clamp switch.
Turns on when the work clamp switch of the triple pedal (option) is pressed.
Start switch.
Turns on when the start switch of the triple pedal (option) is pressed.
STOP switch connection signal.
Turns off when the STOP switch is not connected.
STOP switch.
Turns on when the STOP switch is pressed.
Safety switch.
Turns off when the machine head is tilted back.
Cutter home position sensor.
Turns off when the cutter is pushed down by hand.
Upper thread breakage detection signal.
Turns off when the upper thread breakage detection guide is moved to the right.
Needle up signal.
Turn the pulley by hand.
* ON in the needle up region, OFF in any other region.
Upper shaft 360 degree rotation signal.
Turn the pulley by hand.
* Increases when turned forward (counterclockwise
rotation).

0783D

key.
key.
ENTER key.
Shortcut 1 key.
Shortcut 2 key.
Shortcut 3 key.
Shortcut 4 key.
Shortcut 5 key.
Shortcut 6 key.
AUTO key.
TEST key.
PROGRAM key.
MEMSW key.
R/W key.
RESET key.
THREAD key.
CUTTER ON key.
WIND key.
COPY key.
FUNC key.
Option input 2.
Option input 3.
Option input 4.
Option input 5.
Option input 6.
Option input 7.
Option input 8.
Option input 9.
Option input 10.

HE-800B

3. FUNCTION SETTINGS

3-8. Output checking method
This is used at the following times.
・ When you would like to check for problems with the operation panel.
・ When you would like to check for a problem with the drive mechanism.
・ When you would like to check for broken cords.
You can check whether the signals being output by the CPU are driving the mechanisms correctly.
NOTE:
Carry out this procedure after checking that the input check is normal. If there are problems with the input signals, it may not
be possible to carry out an output check.

0800D

key (1), turn on the power switch.
1. While pressing the
2. Depress the treadle to the 2nd step. (Start switch for a triple pedal)
The needle bar and the work clamp will move to the home position. Item numbers and item names will be displayed on the
screen.
key (2) or the
key (1) to select the desired item number.
3. Press the
or
key (3).
4. The operations for item codes 51 to 53 can be checked by pressing the
* The operation for that check item will be carried out while the key is being pressed.
5. For item numbers 54 and after, depress the treadle to the 2nd step. (Start switch for a triple pedal)
* The operation for the item being checked will be carried out while the treadle is being depressed.
6. When returning to normal operation, turn power off and then on again.

HE-800B

3. FUNCTION SETTINGS

Item No.
51
52

54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78

Operation
When the
and
keys are pressed, the needle bar will move in units of 1 mm.
: Needle bar moves to the right (+).
: Needle bar moves to the left (-).
When the
and
keys are pressed, the work clamp will move in units of 0.1 mm.
: Work clamp moves to the front (+).
: Work clamp moves to the back (-).
When the
and
keys are pressed, the work clamp will move in units of 0.12 mm.
: Work clamp moves up (+).
: Work clamp moves down (-).
At this time, upper thread trimming and lower thread trimming are carried out in conjunction with the
operation of the work clamp.
The buzzer will sound for 0.7 second, and then the sewing machine will start (at the longest for 1 minute).
Immediately after the motor stops, the upper shaft angle (normally around 55) will be displayed.
and
keys to change the speed (between 1000 sti/min
While the motor is stopped, you can press the
and 4000 sti/min).
The buzzer will sound for 0.7 second, then the work clamp will move 15 mm back and forth, and then the
cutter will operate.
The tension release solenoid will turn on.
The panel indicators will illuminate in order.
CAUTION → AUTO → TEST → . . . . → COPY
The buzzer will sound.
Option output 1 will turn on.
Option output 2 will turn on.
Option output 3 will turn on.
Option output 4 will turn on.
Option output 5 will turn on.
Option output 6 will turn on.
Option output 7 will turn on.
Option output 8 will turn on.
Option output 9 will turn on.
Option output 10 will turn on.
Option output 11 will turn on.
Option output 12 will turn on.
Option output 13 will turn on.
Option output 14 will turn on.
Option output 15 will turn on.
Option output 16 will turn on.
Option output 17 will turn on.
Option output 18 will turn on.
Option output 19 will turn on.
Option output 20 will turn on.

HE-800B

3. FUNCTION SETTINGS

3-9. Confirming software version

0621D

1. If you turn on the power while pressing the
key (1), the software version will be displayed in the menu display (2).
2. The PROGRAM No. display (4) will change as follows each time the
or
key (3) is pressed.

0622D

USR
IPL

MN
MT
PL
MN
MT
PL

Main control program
Motor control program
Panel control program
Main IPL
Motor IPL
Panel IPL

3. Press the TEST key (5) to return to the normal display. The sewing machine will switch to home position detection
standby.

HE-800B

3. FUNCTION SETTINGS

3-10. Protection settings
There are two ways which can be used to switch to protect setting mode: Method A (which does not require an SD card) and
Method B (which requires an SD card).
If you want to set up the sewing machine so that these modes cannot be distinguished, it is recommended that you set the
method to Method B.
* If using an SD card, read the section titled “4-1. Notes on handling SD cards (commercially available)”.

Method A
1. While pressing the RESET key (1) and the TEST key (2) and the ENTER key (3), turn on the power switch.
* The previous protection level (OFF, 1 to 5) will appear in the menu display (4).
* The protection level is set to OFF at the time of shipment from the factory.

0801D

* If a beeping sound is heard and “Wrong Starting” is displayed, it means that the method has been set to “Method B”.
In this case, start by means of method B. (Refer to the next page.)
2. Press the

key (5) to select the protection level.

Protection level
OFF
1 to 4
5

Details
Nothing is disallowed.
Certain operations are disallowed depending on the protection level.
* Protected items have been preset for each level. Refer to “Table of protection
levels and corresponding protected items” on page 25.
You can set the protection level for each of the 11 items individually.
* Set to ON (disallowed) or OFF (allowed) for each item.
* All items are set to OFF at the time of shipment from the factory.

3. Press the ENTER key (3) to store the protection level.
* If setting to a protection level other than level 5, proceed to step 4. If setting to level 5, proceed to step 5.
4. Press the TEST key (2).
* The display will return to the normal display and the sewing machine will change to home position standby.
5. Item numbers and setting values (ON/OFF) will be displayed on the screen.

0802D

6.
7.
8.
9.

Press the
or
key (6) to select the item number (1 to 11). (Refer to page 25.)
Press the
or
key (5) to change the setting (ON/OFF).
Press the ENTER key (3) to store the setting (ON/OFF).
Repeat steps 6 to 8 above for each item, and then press the TEST key (2).
* The protect setting mode will be exited and the sewing machine will change to home position standby.
* To return to the protection level setting status (step 2 above), press the FUNC key (7).

HE-800B

3. FUNCTION SETTINGS

Method B
Have an SD card ready.
* The SD card is only used at the step of selecting protect setting mode, so any type of SD card can be used as long as it
can be accessed. In addition, if making the setting two or more times, a different SD card from the one used before can be
used.
1. Insert the SD card, and then while pressing the RESET key (1) and the TEST key (2) and the ENTER key (3), turn on the
power switch.
* The previous starting method (“A, B” or “B”) will appear in the menu display.
* The method is set to “A,B” at the time of shipment from the factory.

0803D

2. Press the

key (4) to select the next starting method.

Starting method
A,B
B

Details
Protect setting mode can be started using either Method A or Method B.
Protect setting mode can only be started using Method B.

3. Press the ENTER key (3) to store the starting method.
4. For the method of operation from this point onward, refer to steps 2 to 9 in “Method A” (previous page).

HE-800B

3. FUNCTION SETTINGS
Table of protection levels and corresponding protected items
× : Operation disallowed

Setting items

Level

OFF

5
1

Data initialization

Standard memory switch settings

Administrator memory switch settings

Changing the program number

Changing the sewing speed
(Parameters relating to sewing speed)

Program editing

Program copy mode

Cutter operation

×
×
×
×

Production counter editing

Lower thread counter editing

Resewing after sewing is interrupted

Home position adjustment

Upper shaft motor reference position
adjustment

Treadle position adjustment

×
×

HE-800B

4. USING SD CARDS

4. USING SD CARDS
4-1. Notes on handling SD cards (commercially available)
•
•
•
•
•
•
•
•
•
•

Use an SD card or a multimedia card with a capacity of 2GB or less.
Do not disassemble or alter SD cards.
Do not bend, drop, scratch or place heavy objects on top of the SD cards.
Do not allow the SD cards to become wet, such as with water, oil, solvents, drinks or any other liquids.
Do not use or store the SD cards in a locations exposed to strong static electricity or electrical interference.
Do not use or store the SD cards in a locations exposed to vibrations or impacts, direct sunlight, extreme dust (or lint), high
temperatures, high humidity, severe temperature fluctuations, or strong magnetic forces (such as from speakers).
Do not subject the SD cards to vibration or shocks or remove them from the sewing machine while data reading or writing
is in progress.
Data on the SD cards may be lost or damaged due to some malfunction or accident. We recommend backing up important
data.
The SD cards that you purchased is already formatted. We recommend that the SD cards not be reformatted.
The recommended SD cards are those sold by SanDisk and Panasonic. Cards from other manufacturers may use different
formatting methods and may not work correctly as a result.

For additional information, refer to the instruction manual included with the SD cards that you have purchased.
* This product is compatible with SD cards that have been formatted using the FAT16/32 method. Cards that have
been formatted using other formatting methods cannot be used.
* All other company and product names mentioned in this instruction manual are trademarks or registered trademarks
of their respective companies. However, the explanations for markings such as TM are not clearly described within
the text.

4-2. Structure of an SD card folder
Data type
Control program

Program data
(parameters)

Folder name
\BROTHER\ISM\ISMSYS\
\BROTHER\ISM\ISMDH**\
* ‘**’ represents the value for memory switch No.
752. If program data from other sewing
machines in the same SD memory card,
change the name of the folder.

File name
ISM09MN.BVP (Main control program)
ISM09MT.BVP (Motor control program)
ISM09PL.BVP (Panel control program)
ISMUPG.SEW

memory switch
data

Same as above

ISMMSW.SEW

cycle program
data

Same as above

ISMCYC.SEW

Error log data

\BROTHER\ISM\ISMLDT\

Stores the files which relate to error logs.

HE-800B

4. USING SD CARDS

4-3. Preparation for reading and writing data
1

Insert the SD card into the SD slot.
NOTE:
• Make sure the SD card is facing the correct way.
• The cover should be closed at all times except when
the SD card is inserted and removed, otherwise dust
may cause trouble

0626D

2
3

Turn on the power switch.
The mode will switch to data read/write mode.

Press the R/W key.

0628D

• The R/W indicator will illuminate and the mode will
switch to data read/write mode.
• The initial status is parameter reading. (Refer to
“Read/write menu list” below.)

0804D

Select the read/write menu.

Press the

key.

0630D

Menu
Details
R1
Program data (parameters) is read from the SD card.
W2
Program data (parameters) is written to the SD card.
R3
Memory switch data is read from the SD card.
W4
Memory switch data is written to the SD card.
All sewing machine data (program data, memory switch data and cycle program data) is read from the
R5
SD card.
All sewing machine data (program data, memory switch data and cycle program data) is written to the SD
W6
card.
W7
Error log data is written to the SD card.

HE-800B

4. USING SD CARDS

4-4. Reading program data (parameters)
1

Select the [R1] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0804D

Press the ENTER key.

2414B

• The buzzer will sound and the program data
(parameters) will be read from the SD card and
copied into the sewing machine’s memory.
• The R/W indicator will flash and “OPERATING” will
be displayed.
• If no program data exists on the SD card, an error
buzzer will sound.

0805D

When the display returns to the status in step 1, reading of
the program data is complete.
or
• If you would like to read more data, press the
key to select the read/write menu, and then read
the data.

0804D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-5. Writing program data (parameters) to an SD memory card
1

Select the [W2] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0806D

Press the ENTER key.

2414B

• The buzzer will sound and the program data
(parameters) will be copied to the SD card.
• The R/W indicator will flash and “OPERATING” will
be displayed.

0805D

When the display returns to the status in step 1, writing of
the program data is complete.
or
• If you would like to read more data, press the
key to select the read/write menu, and then read
the data.
0806D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-6. Reading memory switch data
1

Select the [R3] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0807D

Press the ENTER key.

2414B

• The buzzer will sound and the memory switch data
will be read from the SD card into the sewing
machine’s internal memory.
• The R/W indicator will flash and “OPERATING” will
be displayed.
• If no memory switch data exists on the SD card, an
error buzzer will sound.

0805D

When the display returns to the status in step 1, reading of
the memory switch data is complete.
• If you would like to read more data, press the
or
key to select the read/write menu, and then read
the data.

0807D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-7. Writing memory switch data to the SD card
1

Select the [W4] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0808D

Press the ENTER key.

2414B

• The buzzer will sound and the memory switch data
will be copied to the SD card.
• The R/W indicator will flash and “OPERATING” will
be displayed.

0805D

When the display returns to the status in step 1, writing of
the memory switch data is complete.
or
• If you would like to read more data, press the
key to select the read/write menu, and then read
the data.
0808D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-8. Reading sewing machine data
1

Select the [R5] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0809D

Press the ENTER key.

2414B

• The buzzer will sound, and the program data, cycle
program data and memory switch data will be read
from the SD card into the sewing machine’s internal
memory.
• The R/W indicator will flash and “OPERATING” will
be displayed.
• If no program data or cycle program data or memory
switch data exists on the SD card, an error buzzer
will sound.

0805D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-9. Writing sewing machine data to an SD card
1

Select the [W6] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0810D

Press the ENTER key.

2414B

• The buzzer will sound, and the program data, cycle
program data and memory switch data will be copied
to the SD card.
• The R/W indicator will flash and “OPERATING” will
be displayed.

0805D

When the display returns to the status in step 1, writing of
the sewing machine data is complete.
or
• If you would like to read more data, press the
key to select the read/write menu, and then read
the data.
0810D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-10. Writing error log data to an SD card
1

Select the [W7] data read/write mode.
Refer to “4-3. Preparation for reading and writing data”.

0811D

Press the ENTER key.

2414B

• The buzzer will sound and the error log data will be
copied to the SD card.
• The R/W indicator will flash and “OPERATING” will
be displayed.

0805D

When the display returns to the status in step 1, writing of
the error log data is complete.
or
• If you would like to read more data, press the
key to select the read/write menu, and then read
the data.
0811D

Exit data read/write mode.

Press any one of the following four keys to exit data
read/write mode.

0662D

HE-800B

4. USING SD CARDS

4-11. Updating the control program version
1
2
3

Place the control program that you would like to update into the folder of the SD memory card as specified in “4-2.
Structure of an SD card folder”.
With the power turned off, insert the SD card into the SD slot.
Refer to step 1 of “4-3. Preparation for reading and writing data”.
While holding down the RESET, TEST and
keys, turn
on the power switch.

0650D

0637D

Keep pressing the key until a beep is heard.

0638D

Press the
updated.
Main
Motor
Panel

key to select the program to be
Types

[1.Mn]
[2.Mt]
[3.PL]

Version No.

[*.*.**]
[*.**]
[*.**]

• The initial status is for the main program to be
selected.
• If there is no program to be updated which is stored
on the SD card, “----” will appear in the menu display.

0639D

Press the ENTER key.

2414B

0640D

Turn off the power switch.

HE-800B

• The buzzer will sound and updating of the program
version will start.
• While version updating is in progress, the progress
status will be displayed.
• When “Updated” is displayed on the screen, version
updating is complete.

5. MECHANICAL DESCRIPTIONS

5. MECHANICAL DESCRIPTIONS
The mechanisms operate in the order of the numbers given in the illustrations.
* and [number] indicates the flow of each operations given.
* (number) indicates part names only. (They do not represent the flow of operations.)

5-1. Needle bar and thread take-up mechanisms
Rotation direction

0641D

1.
2.
3.
4.

Motor
Upper shaft
Needle bar crank
Needle bar crank

5.
6.
7.
8.

Thread take-up crank
Slide block
Needle bar clamp
Needle bar

<5> Thread take-up assembly

HE-800B

5. MECHANICAL DESCRIPTIONS

5-2. Upper shaft, lower shaft and rotary hook mechanisms
Rotation direction

1.
2.
3.
4.
5.
6.
7.
8.

0642D

Motor
Upper shaft
Joint assy
Timing belt
Timing pulley
Lower shaft
Rotary hook joint
Rotary hook

HE-800B

5. MECHANICAL DESCRIPTIONS

5-3. Needle zigzag mechanism

0643D

1.
2.
3.
4.
5.
6.

Pulse motor
Zigzag connecting rod
Zigzag lever
Zigzag lever F assembly
Needle bar bracket slide block
Needle bar bracket

HE-800B

5. MECHANICAL DESCRIPTIONS

5-4. Presser foot lifter mechanism

0644D

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Pulse motor
Driving gear
Presser driving arm
Presser foot lifter connecting rod
Knee lifter lever
Upper thread trimmer driving link
Knee lifter lever
Presser bar guide bracket assembly
Presser bar
Presser roller bracket
Feed arm support
Work clamp

HE-800B

5. MECHANICAL DESCRIPTIONS

5-5. Feed mechanism
1.
2.
3.
4.

Pulse motor
Pulley A
Timing belt
Feed arm support base

5. Feed arm
6. Work clamp

<5> Length feed plate

0645D

5-6. Cutter mechanism
1.
2.
3.
4.
5.
6.
7.

Cutter solenoid
Cutter link bracket
Slide block
Cutter driving arm
Cutter driving link
Driving shaft holder assembly
Cutter driving shaft

0646D

HE-800B

5. MECHANICAL DESCRIPTIONS

5-7. Thread breakage detection mechanism

0647D

1.
2.
3.
4.

Thread guide
Thread breakage perceiving shaft
Cutter bar fixed plate assembly
Sensor

HE-800B

5. MECHANICAL DESCRIPTIONS

5-8. Tension release mechanism
[Zigzag tension control]
1.
2.
3.
4.
5.

Tension release solenoid assembly
Tension release solenoid link
Tension release link
Tension release pin
Tension disc pressers

0648D

[Tack tension control]
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Pulse motor
Driving gear
Presser driving arm
Presser foot lifter connecting rod
Knee lifter lever
Upper thread trimmer driving link
Tension release driving lever
Tension release shaft
Tension release cam
Tension release pin
Tension disc pressers

0649D

HE-800B

5. MECHANICAL DESCRIPTIONS

5-9. Upper thread trimmer mechanism
Upper thread trimmer mechanism operating sequence
Sewing starts
(machine starts)

The upper thread scissors
retract and
the presser foot lifts

The presser foot drops.

Presser
foot
drops

Presser
foot
lifts

Upper thread scissors movement
After 1.5-2.5 mm of feed, the
upper thread scissors
gradually start to open.

Sewing ends.

The upper thread scissors
move forward.
Upper thread trimming

After approximately 4.6mm of
feed, the upper thread
scissors are fully open.

The upper thread is clamped
and cut.

1739B

HE-800B

5. MECHANICAL DESCRIPTIONS

0652D

1.
2.
3.
4.
5.

Pulse motor
Driving gear
Presser driving arm
Presser foot lifter connecting rod
Knee lifter lever

6. Upper thread trimmer driving link
7. Trimmer driving lever
8. Longitudinal feed arm

<7> Driving lever
<8> Trimmer driving arm

9. Upper thread trimmer lever
10. Setting plate
11. Upper thread trimmer assembly

HE-800B

5. MECHANICAL DESCRIPTIONS

5-9-1. Upper thread scissors

Gradually opens

0653D

0654D

1. Opening cam
2. Scissors M

HE-800B

5. MECHANICAL DESCRIPTIONS

5-9-2. Upper thread scissors

Open

0656D

0657D

0658D

1. Cam
2. Back plate
3. Stop plate

4. Back stopper
5. Upper thread trimmer lever
6. Upper thread trimmer assembly

HE-800B

(1) Feed arm
(2) Extension spring

5. MECHANICAL DESCRIPTIONS

5-10. Lower thread trimmer mechanism
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Pulse motor
Driving gear
Presser driving arm
Presser foot lifter connecting rod
Lower thread trimmer cam lever
Lower thread trimmer cam
Lower thread trimmer cam connecting rod
Lower thread trimmer cam connecting rod
Lower thread trimmer link
Lower thread trimmer connecting rod
Knife driving lever

12.
13.
14.
15.
16.
17.

Collar
<12> Fixed knife set
Lever
Lower thread retainer
Lower thread clamp plate
Lower thread presser
Fixed knife set

Lower thread retainer, Lower thread trimmer
0659D

HE-800B

5. MECHANICAL DESCRIPTIONS

5-10-1. Lower thread clamp open at the sewing start Open

0661D

1.
2.
3.
4.
5.

Feed guide shaft B
Roller
Opening plat
Collar
Lower thread clamp plate

(1) Spring
(2) Lower thread presser

HE-800B

6. ASSEMBLY

6. ASSEMBLY
CAUTION
Disassembly should only be carried out by a qualified
technician.
Turn off the power switch before disassembly,
otherwise the machine may operate if the foot switch
is depressed by mistake, which may result in injury.
Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they
do not get into your eyes or onto your skin, otherwise
inflammation can result.
Furthermore, do not drink the oil or eat the grease
under any circumstances, as they can cause
vomiting and diarrhea.
Keep the oil out of the reach of children.

HE-800B

When replacing parts and installing optional
accessories, be sure to use only genuine Brother
parts.
Brother will not be held responsible for any accidents
or problems resulting from the use of non-genuine
parts.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
To prevent accidents and problems, do not modify
the machine yourself.
Brother will not be held responsible for any accidents
or problems resulting from modifications made to
the machine.

6. ASSEMBLY

Assemble each part in order of the numbers.

6-1. Lower shaft and idle pulley mechanisms
*

Refer to the detailed descriptions on the next page for details on A to G in the illustration.

Gently push while
installing.

C
D
Insert as far as the
bottom of the hole.

G
Install so that
there is no play.

Set so that the worn
surface is facing toward
the bush.

F
0663D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Wick
Collar
Wick
Felt
Rotary hook shaft bush
Rotary hook felt support
Screws [2 pcs]
Timing belt
Retaining ring
Ball bearing [2 pcs]
Retaining ring

12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

Idle pulley
Collar
Shaft
Set screws [2 pcs]
Bush assy M
Timing pulley
Lower shaft
Set screw collar
Wick
Spring
Rotary hook felt

23.
24.
25.
26.
27.
28.
29.
a.
b.
c.

Set screws [2 pcs]
Set screws [2 pcs]
Cover
Screws [2 pcs]
Rubber presser
Spring
Screw
Rubber plugs [4 pcs]
Oil feeding pipe [4 pcs]
Bearing

Push in the felt (4) so that the
wick (3) is touching the lower
shaft (18).
0664D

0660D

0666D

0665D

Check that the spring (20) is not compressed when the wick
(21) is pulled in the direction of the arrow. Push the end of the
felt (22) into the hole in the bush (5) and stop it from turning.
0669D

As a guide for the lubrication amount, the
optimum position can be obtained if the
screw (29) is tightened as much as possible
and then loosened about two turns. Refer to
“7-19. Adjusting the rotary hook lubrication”
to check and adjust the lubrication amount.

0667D
0668D

HE-800B

6. ASSEMBLY

6-2. Lower thread trimmer mechanism
*
*

Refer to the detailed descriptions on the next page for details on A to C in the illustration.
Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by

Tighten so that (11) moves
smoothly with no play.

Tighten
so
that (4) moves
smoothly with
no play.
0857D

HE-800B

6. ASSEMBLY

1. Lower thread trimming cam
connecting rod
2. Driving lever roller
3. Shoulder screw
4. Lower thread trimmer cam
5. Lever shaft
6. Set screw
7. Roller shaft
8. Nut
9. Roller
10. Retaining ring
11. Lower thread trimmer cam
lever
12. Cam shaft, ;L-TR
13. Washer
14. Retaining ring
15. Set screw
16. Cover
17. Lower thread trimmer link
18. Shoulder screw
19. Shoulder screw
20. Screw
21. Opening plate, B
22. Screw
23. Shoulder screw
24. Roller
25. Roller shaft

26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.

Opening plate, A
Shoulder screw
Spring
Screw
Lever assembly
Collar
Lower thread retainer
Screws [2 pcs]
Screw
Knife driving lever
Collar
Plain washer D
Plain washer U
Shoulder screw
Lower thread clamp plate
assembly
Washer
Plain washer
Shoulder screw, SM3.18
Lower thread presser
Shoulder screw
Screw
Lower fixed knife assy
Movable knife assy
Washer
Plain washer

Press down

Forward

Back

51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
a.
b.
c.
d.
e.

Bind
Bind
Needle plate
Flat screws [2 pcs]
Base plate
Screws [4 pcs]
Spring hook U
Bobbin presser bracket
Screw
Nut
Bobbin presser
Screw
Auxiliary plate
Opening plate
Shoulder screw
Shoulder screw
Shoulder screw
Shoulder screw
Spring [2 pcs]
Lower thread trimmer link assy
A
Lower thread connecting rod A
Screws [2 pcs]
Needle plate cover
Base plate

Approx.12.5 mm

Needle hole

Needle

0670D

Move the base plate (55) so that the needle is exactly in
the middle of the needle hole in the needle plate (53) in
the forward and back directions, and then tighten the four
screws (56).

Bobbin case

0672D

Turn on the power, and after the sewing machine returns
to the home position, turn the screw (59) and the nut (60)
to adjust so that the clearance between the bobbin presser
(61) and the edge of the bed is approximately 12.5 mm.

Install so that the end of the bobbin presser (61) is at the
center of the bobbin case.

0671D

HE-800B

6. ASSEMBLY

6-3. Feed mechanism
*

Refer to the detailed descriptions on the next page for details on A to C in the illustration.

Tighten the two bolts
(38) so that the feed
arm (48) moves
smoothly.

Tighten the four screws (37)
so that the window in the
length feed plate (33) is in the
center of the needle plate
when the feed arm (48)
is moved forward and back.

Be careful to install
so that the motor
harness opening is
facing the correct
way. Refer to C
Tighten so that (6) moves
back and forth smoothly.

C
B

0708D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Linear bushing [2 pcs]
Ball bearing stoppers [2 pcs]
Screws [2 pcs]
Linear bushing
Retaining rings [2 pcs]
Feed arm support base
Feed guide shaft A
Socket bolts [2 pcs]
(Temporarily tighten)
Feed guide shaft B
Set screw
Socket bolts [2 pcs] (Fully
tighten)
Ball bearing [2 pcs]
Timing belt
Pulley
Support shaft
Set screws [2 pcs]
Belt holder
Bolt [2 pcs]
Pulley
Set screws [2 pcs]

21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Feed motor
Motor mounting bracket
Socket bolts [4 pcs]
Plain washers [3 pcs]
Screws [3 pcs]
Socket bolt
Nut
Feed sensor
Screw
Feed sensor support plate
Washers [2 pcs]
Screws [2 pcs]
Length feed plate
Spring washers [2 pcs]
Socket bolts [2 pcs]
(Temporarily tighten)
Feed presser plate [2 pcs]
Screws [4 pcs]
Socket bolts [2 pcs] (Fully
tighten)
Feed cover
Plain washer

41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.

Socket bolt
Cam
Washers [2 pcs]
Socket bolts [2 pcs]
Support plate
Washers [2 pcs]
Socket bolts [2 pcs]
Feed arm
Feed arm support shaft
Set screw
Spring
Work clamp assembly
Shoulder screw
Feed arm support

a.
b.
c.
d.
e.

Work clamp support M
Work clamp 25RS
Spring plate [2 pcs]
Screws [2 pcs]
Finger guard M

0673D

Align reference line A on feed guide shaft B with the edge of the
feed arm support base, and then tighten the set screw (10).

HE-800B

0772D

Assemble as shown in the illustration.

6. ASSEMBLY

Measurement position
(Middle of belt)

0675D

Repeat steps1 to 3 to adjust the belt tension until it is within the ranges given below.
・ When using a new belt: 40 - 45 N
・ When reusing an old belt: 30 - 45 N
1)
2)
3)
4)
5)

Loosen the three screws (23) so that the feed pulse motor (19) moves easily.
Use the adjustment screw (24) to adjust the belt tension.
Tighten the three screws (23).
Check that the timing belt (13) moves smoothly.
Loosely tighten the nut (25).
*
*

Be sure to use a belt tension gauge to measure the belt tension, and measure at the position shown in the
illustration.
The belt tension gauge should be set to measure a unit weight of 0.25 gf/cm, a belt width of 10 mm and a span
length of 169 mm.

[Reference]
If no belt tension gauge is available, use a push pull gauge to apply 98N of force to the notch in the motor mounting bracket
(20) while tightening the three screws (23).

HE-800B

6. ASSEMBLY

6-4. Threading mechanism
*
*
*

Before carrying out the assembly in “6-4. Threading mechanism””, carry out the assembly in steps 1 to 13 in “6-9.
Lubrication mechanism”.
Refer to the detailed descriptions on the next page for details on A to C in the illustration.
Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by
.

Insert from the face
plate side.

0709D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.

Tension release solenoid
Solenoid holder
Screws [3 pcs]
Tension
release
rubber
assembly
Tension release solenoid link
Plate
Plunger pin
Spring
Plain washer
Socket bolt
Tension release link
Shoulder screw
Screws [2 pcs] (Temporarily
tighten)
Shoulder screw
Tension release pin
Tension stud L
Tension disc [2 pcs]
Tension disc pressers
Tension spring
Washer on tension spring
Tension nut
Thread take-up spring
Tension stud bracket
Set screw

25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.

O Ring
Set screw, socket
Screws [2 pcs] (Fully tighten)
Thread guide, L ;arm
Thread guide cover
Screw
Adjusting lever
Lever link
Tension take-up lever
Shoulder screws [2 pcs]
Lever
Washer
Screw
Washer
Shoulder screw
Plain washer
Screw
Sub tension stud
Tension disc [2 pcs]
Tension disc pressers
Tension nut collar
Tension spring
Washer
Knob nut stopper

49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.

Tension nut
Tension release pin
Tension stud
Tension disc [2 pcs]
Tension disc pressers
Tension disc pressers
Tension spring
Tension nut collar
Guide block
Tension nut
Tension release lever bracket
Spring
Tension release lever
Shoulder screw
Arm thread guide
Screw
Arm thread guide
Screw
Thread retainer
Screws [2 pcs]
Threading bar, U
Nut

a. Threading plate

Tighten the socket bolt (10) so that the distance A
between the end of the solenoid 1 and the plate
(6) is 13.7 mm.

0676D

Needle
bar
Needle
bar
thread
guide

0.5 mm
or more

0678D

0.5 to 1.0 mm

0677D

Tighten the two screws (27) so that the tension disc
opening amount is 0.5 to 1.0 mm when the tension
release link (11) is moved in the direction of B.

(After installing the needle bar thread guide by referring to
"6-10. Needle bar and thread take-up mechanisms"), tighten
the screw (30) to adjust the gap between the needle bar
thread guide and arm thread guide L (28) to 0.5 mm or more
when the needle bar is at its highest point at the maximum
right zigzag position (3 mm).

HE-800B

6. ASSEMBLY

6-5. Presser lifter mechanism
*
*

Refer to the detailed descriptions on the next page for details on A to D in the illustration.
Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by

C
Tighten the four socket
bolts (57) so that the
presser driving arm
(52) moves up and
down easily and so
that there is very little
play in the gear.

C
D

B
A
Insert into the countersunk
hole in the arm.

Insert the pin
into the groove
in the cam
(20), and then
insert it into the
arm.

0710D

HE-800B

6. ASSEMBLY

1. Presser foot lifter connecting
rod
2. Roller
3. Shoulder screw
4. Spring washer
5. Nut
6. Knee lifter lever
7. Spacer
8. Washer
9. Bolt
10. Upper thread trimmer driving
link
11. Knee lifter lever
12. Shoulder screw
13. Shoulder screw
14. Trimmer driving lever [2 pcs]
15. O rings [2 pcs]
16. T-release driving lever assy
17. Upper thread trimmer driving
link
18. O Ring
19. Tension release shaft
20. Tension release cam
21. Retaining ring

22. Set screw
23. Set screw (Temporarily
tighten)
24. Lifter shaft
25. Plain washer
26. Retaining ring
27. Set screw
28. Bearing
29. Shoulder screw
30. Driving lever roller
31. Shoulder screw
32. Lifter shaft A
33. Set screw
34. Spacer
35. Washer
36. Bolt
37. Zigzag pulse motor
38. Motor lever
39. Set screws [2 pcs]
40. Presser lifter pulse motor
41. Gear
42. Set screws [2 pcs]

43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.

Motor bracket
Socket bolts [4 pcs]
Socket bolts [4 pcs]
Linear bush [2 pcs]
Bearing holder
Socket bolt
Guide shaft [2 pcs]
Guide bracket
Set screws [4 pcs]
Presser driving arm
Socket bolts [4 pcs]
(Temporarily tighten)
Driving arm presser
Washer
Set screw
Socket bolts [4 pcs] (Fully
tighten)
Positioning pin [2 pcs]
Motor bracket assembly
Screws [4 pcs]
Screw

0679D

While pushing the tension release shaft (19) in the direction of the arrow A, and also pushing the tension release driving
lever (16) in the direction of the arrow B, tighten the set screw (22) on the screw flat of the tension release shaft (19).

HE-800B

6. ASSEMBLY

Zigzag motor

Screw stop side

Presser lifter motor
Index mark

Screw stop side

0680D

Direction of the harness
Zigzag motor

Presser lifter motor

Index marks aligned
0681D

HE-800B

0691D

6. ASSEMBLY

6-6. Needle zigzag mechanism
*

Refer to the detailed descriptions on the next page for details on A in the illustration.

Tighten so that there
is no play in the
thrust direction.

Knot
0711D

1.
2.
3.
4.
5.
6.

Bush, z-lever
Zigzag connecting rod shaft
Zigzag lever
Zigzag connecting rod
Set screw
Wick

7.
8.
9.
10.
11.
12.

Oil tube
Felt
Fastening bands [2 pcs]
Zigzag lever shaft
Thrust collar
Zigzag lever

HE-800B

13.
14.
15.
16.
17.

Socket bolt
Wick
Motor lever shaft
Washer
Set screw

6. ASSEMBLY

1) Install the needle to the needle bar, and
secure it in position so that the tip of the
needle is aligned with the center of the
cutter groove in the needle plate.
2) Tighten the socket bolt (13) at the position
where the index hole in the motor lever and
the reference line on the motor bracket are
aligned.
* At this time, tighten so that there is no
play in the thrust direction.
Align the center of
the cutter groove
and the tip of the
needle.

0683D

Motor bracket
Motor lever

Align the reference
line on the motor
bracket and the
index
hole
in
the motor lever.

0684D

HE-800B

6. ASSEMBLY

6-7. Cutter mechanism
*
*

Refer to the detailed descriptions on the next page for details on A to E in the illustration.
Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by

Check that the plunger of the cutter
solenoid (18) moves easily along the full
length of its stroke.

E
D
Check that the plunger of the
cutter solenoid (18) moves easily
along the full length of its stroke.

Tighten so that the cutter
solenoid shaft is aligned
with the edge.

Tighten
so
that
there
is
no play in
the thrust
direction.
Tighten so that it moves
smoothly up and down
with no play.

0712D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Cutter driving arm shaft
Set screw collar
Cutter driving arm assembly
Set screws [2 pcs]
Set screw
Cutter bar guide [2 pcs]
Screws [4 pcs] (Temporarily
tighten)
Cutter driving link
Needle bar guide slide block
Cutter driving shaft holder
Set screw
Screws [4 pcs] (Fully tighten)
Stopper cushion
Nut
Solenoid stopper
Spring washer
Nut
Cutter solenoid
Cutter solenoid bracket
Bolts [3 pcs]

21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Slide block
Washer
Retaining ring
Cutter link bracket
Bolt (Temporarily tighten)
Screws [4 pcs] (Temporarily
tighten)
Bolt (Fully tighten)
Screws [4 pcs] (Fully tighten)
Cutter driving shaft
Felt
Cutter driving shaft holder
Oil rejector
Set screws [2 pcs]
(Temporarily tighten)
Adjusting screw assembly
Nut
Cutter holder DM
Screws [2 pcs]
Cutter holder M
Bolts [2 pcs]
Cutter holder

41.
42.
43.
44.
45.
46.
47.
48.

Bolt
Cutter
Screw
Spring
Cutter sensor
Screw
Cutter sensor setting plate
Screw

a.
b.
c.
d.
e.
f.
g.
h.
i.
j.

Pin, dowel
Pin
Set screw
Cutter driving arm
Cutter driving link shaft
Cutter driving shaft holder
Adjusting screw
Cushion spring
Cushion support
Shoulder screw

Oil tube
Tube support U
Oil tube

Insert

0685D

0686D

Insert the oil tube and the cord of the cutter solenoid (19) in
between tube support U and the arm.

Tighten the two set screws (33) so that the distance A
between the processed surface of the arm and the end of
the cutter driving shaft (29) is 24.5 mm when the cutter
solenoid (18) is at the stroke end (when the solenoid
stopper (15) is touching the stopper cushion (13)).
* Lift up the cutter driving shaft by hand at this time and
check that it moves by its own weight. If it does
not move, loosen the socket bolt (27) and the screw (28)
and readjust the cutter driving shaft so that it moves
easily.
0689D

HE-800B

6. ASSEMBLY

0688D

HE-800B

0690D

6. ASSEMBLY

6-8. Upper shaft and tension pulley mechanisms
*

Refer to the detailed descriptions on the next page for details on A to B in the illustration.

Tighten (15) so that
there is no play in
the thrust direction.

Align the screw at
the front in the
turning
direction
with the screw stop
on (3), and then
tighten the screw.

Touch against the
edge of (10) and then
tighten.

Set so that the harnesses are
pointing directly downward.

0713D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Bush F
Cap
Upper shaft
Bearing bush assy
Bobbin winder pulley
Flange
Timing pulley U
Washers [3 pcs]
Socket bolts [3 pcs]
Joint
Thread take-up crank

12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

Screw
Set screw
Timing belt
Set screws [2 pcs]
Set screws [2 pcs]
Motor
Screws [3 pcs]
Set screws [2 pcs]
Set screws [2 pcs]
Pulley
Screws [3 pcs]

23.
24.
25.
26.
27.
28.
29.
30.
31.
32.

Retaining ring
Bearing
Retaining ring
Tension pulley
Collar
Socket bolt
Tension pulley plate
Nut
Plain washers [2 pcs]
Socket bolts [2 pcs]

Align the reference line on the upper shaft (3) and the edge of
the joint (10), and then tighten the set screw (16) which is at
the front in the turning direction so that it is aligned with the
screw stop on the upper shaft (3).

Aligned with reference
line

0692D

After installing the needle bar as described in “6-10. Needle
bar and thread take-up mechanisms”, install these parts so
that the mating mark on the pulley is on the left when viewed
from the rear of the sewing machine when the upper shaft (3)
is at the needle up stop position.
Align the phases of the upper shaft and lower shaft so that
the mating mark A on the lower shaft timing pulley is pointing
straight down when the upper shaft pulley is as described
above, and then adjust the belt tension.

Upper shaft pulley
mating mark

0693D

1) Push the tension pulley plate (29) in the direction of the arrow

to adjust the belt tension to the value range given below.
・ When using a new belt: 75 - 85 N
・ When reusing an old belt: 65 - 75 N
* Re-check at this time to make sure that the upper shaft and
lower shaft are not out of phase.
* Be sure to use a belt tension gauge to measure the belt
tension, and measure at position a shown in the illustration.
* The belt tension gauge should be set to measure a unit
weight of 0.25 gf/cm, a belt width of 15 mm and a span
length of 228 mm.
[Reference] If no belt tension gauge is available, use a push pull
gauge to apply 98 N of force to the tension pulley plate
(29) to push it in the direction of the arrow, and then
0694D
tighten the two socket bolts (32).

HE-800B

6. ASSEMBLY

6-9. Lubrication mechanism
*
*

Refer to the detailed descriptions on the next page for details on A to H in the illustration.
Carry out the steps from (1) through to (13) in “6-4. Threading mechanism”.

F
G

E
C
D

H
0714D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.

Oil tube assembly
Felt holder
Screw
Oil tube
Cord holder #5
Plain washer
Screw
Tube support, R
Screw
Oil tube
Tube support M
Screw
Fastening bands 1.9×80
Felt
Wick 4×50
Wick 3×150
Felt
Wick 3×160
Felt
Wick 4×50×330
Tube support U
Screw
Oil tube

24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.

Oil tube
Tube support
Screw
Felt
Felt support
Screw
Collar
Wick 2×140
Oil terminal
Packing
Oil cap
Oil pipe B
Tube support
Screw
Wick base support
Screws [2 pcs]
Wick 3×290
Wick
Oil tube
Oil tube
Felt base A
Screw
Fastening bands 1.9×80
0695D

47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.

Screws [2 pcs]
Felt
Cap
Screw
Plunger [2 pcs]
Compression spring [2 pcs]
Screws [2 pcs]
Oil tube
Oil tube
Tube support
Screw
Tube support D
Screw
Cord holder #10
Plain washer
Screw
Pump filter
Spring [2 pcs]
Screws [2 pcs]
Oil filter mounting plate assy
Screws [3 pcs]

0696D

Thread
take-up
cover

Thread take-up cover

1） Insert the oil tube assembly (1) into the arm, and
then insert it into the hole in the thread take-up
cover.
2） Install the felt holder (2) with the screw (3), and then
secure the oil tube assembly (1).

1） Install the oil tube (4) that is connected between the oil
terminal and the oil outlet with the cord holder (5),
screw (7) and washer (6).
2） Clamp the oil tube assembly (1) under the cord holder
(5).

HE-800B

6. ASSEMBLY

0697D

Arm hole

0698D

Wick should not
protrude
from here

Upper
shaft

1） Install the tube support (8) with the screw
(9), and then secure the oil assembly (1)
and the oil tube (4) that is connected
between the oil terminal and the oil outlet
so that they do not touch the pulse motor
(for presser lifter).
2） Install the oil tube (10) that is connected to
the oil terminal and the plunger pump with
the tube support M (11) and the screw
(12), pass it through the arm hole, and
then secure it to the arm with the fastening
band (13).
* At this time, bind the oil tube carefully so
as not to break it.

Bush F
Push so they touch
the upper shaft

1） Insert the felt (14) into the bush F.
2） Insert the wicks (15) and (16) into the bush F, and insert the felt
(17) to stop them from coming out.
* At this time, push in firmly so that the felt (14) and the wick (15)
are touching the upper shaft. If they are not pushed in firmly
enough, seizure of the upper shaft may occur.
3） Insert the wick (18) into the bush F, and insert the felt (19) to stop
them from coming out.

0699D

1） Pass the wick (20) through the tube support U (21) and push it firmly into the zigzag lever shaft lubrication hole.
2） Install the tube support U (21) with the screw (22).
3） Pass the oil tube (23) around the outside of the tube support U (21) as shown in the illustration.

HE-800B

0700D

6. ASSEMBLY

0701D

Motor bracket

Cutter solenoid

Cutter solenoid
Felt

Solenoid
stopper

Felt

Zigzag
connecting
rod
Zigzag connecting rod

0702D

1） Pass the oil tube (24) through the tube support U (21) and the tube support (25), and then secure the tube support (25)
with the screw (26).
2） Install the felt support (28) to the motor bracket with the screw (29) at the position where the felt (27) and the felt of the
zigzag connecting rod are gently touching.
3） Pass the oil tube (24) around the outside of the tube support U (21) as shown in the illustration so that it does not touch
the solenoid stopper, and then pass it in between the cutter solenoid and the arm.

HE-800B

6. ASSEMBLY

0703D

0705D

Push into the groove

0706D

0704D

1） Pass the wick (31) through the collar (30), and then insert it into the oil terminal (32). Push the wick (31) firmly enough
into the groove as shown in the illustration.
2） Insert the packing (33) into the oil terminal (32), and then install the oil cap (34).
3） Pass the wick (31) through the oil pipe B (35), and then install it to the oil terminal (32).
4） Push the oil tube (10) that is connected between the oil terminal and the plunger pump into the oil terminal (32).
5） Push the oil tube (4) that is connected between the oil terminal and the oil outlet into the oil terminal (32).
6） Install the tube support (36) to the wick base support (38) with the screw (37).
7） Attach the oil tube (4) to the tube support (36), and then install the oil terminal (32) to the wick base support (38) with the
two screws (39).
8） Pass the wick (40) of the needle bar bracket, the two wicks of the bush F, and the wick 41 coming from the thread
take-up support shaft through the oil tubes (42) and (43), and then install the wick base A (44) to the wick base support
(38) with the screw (45).
9） Install the oil tube (24) for lubricating the bush M and the zigzag lever shaft and the oil tube (23) for lubricating the
zigzag mechanism to the wick base support (38) with the fastening band (46).
10） Install the wick base support (38) with the two screws (47).
11） Insert the felt (48), and then install the cap (49) with the screw (50).

HE-800B

6. ASSEMBLY

Bush M

0774D

Lower shaft

Bush M

0668D 0773D

1） Check that the notches A of the plungers (51) and the lower shaft are aligned, and then insert the two plungers (51)
and the compression springs (52) into the bush M and secure them with the two screws (53).
2） Insert the oil tube (1) into the lubricating hole to the right of the bush M.
3） Insert the oil tube (54) that is connected between the plunger and the filter into the lubricating hole to the left of the
bush M.
4） Insert the oil tube (55) into the lubricating hole to the right of the bush M.
5） Pass the outlet of the oil tube (55) through the tube support (56), and then install the tube support (56) to the bed with
the screw (57).
6） Insert the oil tube (10) that is connected between the oil terminal and the plunger pump through the lubricating hole to
the left of the bush M.
7） Pass the oil tube (4) that is connected between the oil terminal and the oil outlet through the tube support D (58), and
then install the tube support D (58) to the bed with the screw (59).
8） Secure the four tubes that are coming out from the bush M to the bed in two places as shown in the illustration with the
cord holders (60), screws (62) and plain washers (61).
9） Install the pump filter (63) to the oil filter bracket (66) with the two springs (64) and the two screws (65).
10） Insert the oil tube (54) that is connected between the plunger and the filter through the oil filter bracket (66).
11） Install the oil filter bracket (66) to the bed with the three screws (67).

HE-800B

6. ASSEMBLY

6-10. Needle bar and thread take-up mechanisms
*

Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by

Insert the needle bar (9) into the
arm, and then install the needle
bar bracket while clamping the
slide blocks (12) and (16).

Tighten so that the
needle bar moves
smoothly.

Tighten so that
there is no play
in the needle
bar
bracket
assy.
When the needle bar (9) is at
its maximum zigzag position,
tighten the set screws (22) and
(24) against the needle bar
bracket assembly (17), and
then loosen them again by
about 1/4 of a turn each. Then
tighten the nuts (23) and (25).

Tighten so that the
thread take-up moves
smoothly with no
play.

1.0 to 2.0 mm
0.5 to 1.5 mm

Tighten so
that there is
no play in
the needle
bar bracket
assy.

When the needle
bar
(9)
is
at
its maximum zigzag
position, tighten the
set screws (22) and
(24) against the
needle bar bracket
assembly (17), and
then loosen them
again by about 1/4
of a turn each. Then
tighten the nuts (23)
and (25).

Screw stop side

0715D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

Crank rod guide
Socket bolts [2 pcs]
Screw
Needle bar guide slide block
Needle bar connecting rod
assembly
Washer
Set screws [2 pcs]
Set screw
Needle bar
Needle bar bracket
Felt
Needle bar clamp assembly
Needle bar guide
Set screws [2 pcs]
Screw

16. Slide block
17. Needle bar bracket
18. Needle bar bracket support
shaft
19. Needle bar bracket guide
20. Set screw
21. Set screw
22. Set screw
23. Nut
24. Set screw
25. Nut
26. Stopper
27. Screws [2 pcs]
28. Needle bar thread guide
29. Needle
30. Set screw

HE-800B

a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.

Needle bar crank
Wick
Needle bar connecting rod
Wick
Needle bearing
Screw (Left-hand thread)
Needle bearing
Thread take-up lever
Thread take-up support
Support shaft
Felt
Wick
Slide block

6. ASSEMBLY

6-11. Presser bar mechanism
*
*

Tighten so that the
presser bar moves
smoothly.

0716D

HE-800B

6. ASSEMBLY

1.
2.
3.
4.
5.
6.
7.
8.
9.

Presser bar lifter link
Shoulder screw
Presser bar guide bracket
Roller
Plain washer
Retaining ring
Roller shaft
Presser roller bracket
Set screw

10. Needle bar guide
11. Screws [2 pcs] (Temporarily
tighten)
12. Presser bar
13. Presser bar guide bracket
14. Oil rejector
15. Set screw (Temporarily
tighten)
16. Screws [2 pcs] (Fully tighten)
17. Presser roller bracket
18. Screw

19.
20.
21.
22.
23.
24.
25.
26.
27.

Knee lifter lever
Shoulder screw
Set screw
Washer
Compression spring
Spring guide
Presser adjusting screw
Presser adjusting nut
Rubber caps [2 pcs]

Install with (14) at the

Presser arm
Work clamp
Gauge (10mm)
0718D

Work clamp

0717D

1） Place a 10 mm gauge underneath the work clamp.
2） Turn on the power, move the feed mechanism to the home position,
and then check that memory switch No. 002 (Work clamp height
when treadle is at neutral) is 10 mm. (If it is not set to 10 mm, set it to
10 mm.)
3） While pushing the presser bar (12) down from above, tighten the set
screw (21) so that the roller (4) is not at an angle to the V-shaped
groove in the presser arm .
4） Remove the gauge and turn off the power.

HE-800B

Insert the spring guide (24), compression
spring (23) and plain washer (22), and
with the presser adjusting screw (25) at a
height of 30 mm, tighten the presser
adjusting nut (26).

6. ASSEMBLY

6-12. Upper thread trimmer mechanism
Apply the grease specified by Brother (Power Knock WB2 from JX Nippon Oil & Energy) in the places indicated by

Align edges

Attach the
larger hook
of the spring
to the pin on
the arm.

Attach the larger
hook of the
spring to the pin
on the arm.

Tighten so that the
upper thread trimmer
fulcrum shaft (1) turns
smoothly.

0719D

HE-800B

6. ASSEMBLY

1. Upper thread trimmer fulcrum
shaft
2. Set screw collar
3. Set screw [2 pcs]
4. Rubber cap
5. Adjusting plate
6. Upper thread trimmer lever
7. Washers [2 pcs]
8. Bolts [2 pcs]
9. Stop plate
10. Back plate
11. Collar [2 pcs]
12. Screws [2 pcs]
13. Spring
14. Support shaft
15. Plain washer
16. Nut
17. Setting plate
18. Plain washers [2 pcs]
19. Screws [2 pcs] (Temporarily
tighten)
20. Longitudinal feed arm pin

21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Set screw
Longitudinal feed arm roller
Retaining rings [2 pcs]
Driving arm roller
Roller shoulder screw
Spring washer
Nut
Support plate
Plain washer
Bolt (Temporarily tighten)
Back stopper
Plain washer
Bolt (Temporarily tighten)
Roller
Upper thread trimmer lever
assembly
Washer
Screws [2 pcs]
Longitudinal feed arm assembly
Bolt (Temporarily tighten)
Trimmer driving arm

41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.

Bolt (Temporarily tighten)
Extension spring
Extension spring
Stopper
Scissors M
Scissors U
Shoulder screw, SM3.18
Thread trimmer assy D
Plain washer
Spring washer
Screw (Temporarily tighten)
Opening cam
Washer plain
Spring washers [2 pcs]
Set screws [2 pcs]
Nuts [2 pcs]
Cam setting plate
Feed arm support
Screws [2 pcs] (Temporarily
tighten)

6-13. Thread breakage detector mechanism

1. Thread breakage perceiving
shaft
2. Thread guide
3. Plain washer
4. Plain washer
5. Screw
6. Cutter bar fixed plate
7. Balancer
8. Screw

9. Set screw (Temporarily tighten)
10. Lever stopper [2 pcs]
11. Screws [2 pcs] (Temporarily
tighten)
12. Sensor
13. Screw
14. Thread breakage sensor plate
15. Screws [2 pcs] (Fully tighten)
0721D

HE-800B

6. ASSEMBLY

6-14. Rotary hook mechanism

4279Q

0723D

Screw stop side
Tighten the set screw (4) so that the oil inlets
A in the rotary hook (3) and the rotary hook
joint assembly (1) are aligned.

1. Rotary hook joint assembly
2. Set screw [2 pcs] (Provisionally
tighten)

0722 D

3. Rotary hook
4. Set screw [2 pcs] (Provisionally
tighten)
Adjust the needle clearance and
timing. (Refer to “7-4. Adjusting the
needle and rotary hook timing”.)

HE-800B

5. Rotary hook holder
6. Screws [2 pcs]

6. ASSEMBLY

6-15. Covers

0725D

1.
2.
3.
4.
5.
6.

Cover
Screws [3 pcs]
Main plate
Screws [4 pcs]
Eye guard assembly
Washer

7.
8.
9.
10.
11.
12.

Screw
Rear cover
Screws [6 pcs]
Top cover
Screws [6 pcs]
Slide cover

HE-800B

13.
14.
15.
16.
17.
18.

Motor cover
Washer
Wave washer
Shoulder screw
Knob screw
Screws [4 pcs]

7. ADJUSTMENT

7. ADJUSTMENT
CAUTION
Maintenance
and
inspection
of
the
sewing machine should only be carried out by a
qualified technician.
Ask your Brother dealer or a qualified
electrician to carry out any maintenance and
inspection of the electrical system.
Turn off the power switch and disconnect the
power cord from the wall outlet at the following
times, otherwise the machine may operate if
the treadle is depressed by mistake, which
could result in injury.
• When carrying out inspection, adjustment
and maintenance
• When replacing consumable parts such as
the rotary hook

If the power switch needs to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
Use only the proper replacement parts as
specified by Brother.
If any safety devices have been removed, be
absolutely sure to re-install them to their
original positions and check that they operate
correctly before using the machine.
Any problems in machine operation which
result from unauthorized modifications to
the machine will not be covered by the
warranty.

7-1. Notes on making adjustments
[When turning on the power to make adjustments]
Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp
before carrying out adjustments.
“Threading” will appear in the parameter display LED and the sewing machine will not operate even if the treadle is depressed.
* Some items are adjusted without the THREAD key being pressed. Carry out the adjustment by following the explanations
given.
[When turning off the power to make adjustments]
Do not force any of the parts to move, as doing so may result in damage to the parts.
• Be sure to turn the machine pulley to raise the needle bar to its highest position before making adjustments.
If this is not done, the pulley position (the direction of rotation of the rotary hook) may cause the lower thread
trimmer mechanism to touch the rotary hook when the lower thread trimmer mechanism operates.
• When turning the machine pulley, do it at a position where the thread trimmer mechanism will not operate (the position where
the presser foot lifter pulse motor is at the home position).
If the machine pulley is turned at a position where the thread trimmer mechanism operates, the needle may touch the lower
thread trimmer mechanism (lower thread retainer and lower thread trimmer knife).
If the machine pulley is turned at a position where the thread trimmer mechanism operates, the rotary hook and the lower
thread trimmer mechanism may touch.
• When moving the feed mechanism, do it at a position where the thread trimmer mechanism will not operate (the position
where the presser foot lifter pulse motor is at the home position).
If this is not done, the lower thread retainer and the feed guide shaft may alternately push against the lower thread clamp
and the opening plate, and damage may result.
• When pushing the knife down by hand, be careful not to let it touch the upper thread scissors.
• Do not move the feed mechanism while the stop plate of the upper thread trimmer lever is pulled forward and the upper
thread scissors are open (the upper thread trimmer lever is pushed to the left).
Always return the stop plate to its original position before moving the feed mechanism or returning it to the home position.

HE-800B

7. ADJUSTMENT

7-2. Adjusting the home position
7-2-1. Switching to home position adjustment mode
While
1

pressing the
the power switch.

and

keys simultaneously, turn on

0727D

0812D

• The home position detection screen for switching to
adjustment mode will be displayed.
Depress the treadle to the 2nd step (for a triple pedal,
depress the start switch).

2nd step

• Home position detection will be carried out, and then the
sewing machine will switch to needle zigzag motor
home position adjustment mode.

4441Q

• When the sewing machine has switched to home
position adjustment mode, the TEST indicator will flash.
Flashing
0813D

Select the home position menu.

Press the

key.

0630D

HE-800B

7. ADJUSTMENT

7-2-2. Needle zigzag (X) motor home position
1
2

Select the “X” home position adjustment mode.
1. Move the feed arm forward by hand so that the cutter (1)
is not touching the scissors (2), and then move the
scissors (2) to the left.

0814D

2. Place some paper under the work clamp, and then push
the cutter (1) down by hand.
3. Turn the pulley by hand until the tip of the needle (3) drops
to the paper.
4. Press the
and
keys to change the offset
(-1.500 mm to 1.500 mm) so that the needle drop position
is aligned with the mark made by the cutter.
• The X motor will operate in accordance with the offset
value.
• The offset value will flash in the display.

0730D

0732D

* If you press the RESET key for 2 seconds or more at
this time, the offset value will be reset to 0.00 mm and X
home position detection will be carried out.

Aligned

2634B

0731D

Press the ENTER key to store the offset value.
At this time, X home position detection will be carried out and
the offset value will illuminate steadily in the display.

0747D
0815D

4
5

Repeat steps 2 and 3 to set the home position to the correct position.
End adjustment mode.
Once home position adjustment operation is finished, press
the TEST key.
• Normal sewing machine operation will then be possible.
Flashing → Illuminates

To carry out home position adjustment for another motor
or
key.
Press the

0630D
0816D

HE-800B

7. ADJUSTMENT

7-2-3. Feed (Y) motor home position
1
2

Select the “Y” home position adjustment mode.

0817D

Press the
and
keys to change the offset value
(-1.500 mm to 1.500 mm) so that the distance A between the
center of the needle hole in the needle plate and the inside
front edge of the work clamp is 1.8 mm.
• The Y motor will operate in accordance with the offset
value.
• The offset value will flash in the display.

0732D

* If you press the RESET key for 2 seconds or more at
this time, the offset value will be reset to 0.000 mm and
Y home position detection will be carried out.

0724D

2634B

Press the ENTER key to store the offset value.
At this time, Y home position detection will be carried out and
the offset value will illuminate steadily in the display.

0747D
0818D

4
5

To carry out home position adjustment for another motor
Press the
or
key.

0630D
0816D

HE-800B

7. ADJUSTMENT

7-2-4. Work clamp (P) motor home position
1
2

Select the “P” home position adjustment mode.

0819D

1. Keep pressing the
key briefly until the panel value
stops changing.
(The upper thread trimmer driving link (1) will
stop moving.)
2. Measure the distance A in the illustration.
3. Press the
key to adjust the offset value (-6.82 mm to
1.86 mm) so that the dimension shown in the
illustration moves to the position where it is equal to
distance A + 0.5 mm.
• The P motor will operate in accordance with the offset
value.
• The offset value will flash in the display.

0732D

* If you press the RESET key for 2 seconds or more at
this time, the offset value will be reset to 0.00 mm and P
home position detection will be carried out.

0737D

2634B

Press the ENTER key to store the offset value.
At this time, P home position detection will be carried out and
the offset value will illuminate steadily in the display.

0747D
0820D

4
5

To carry out home position adjustment for another motor
or
key.
Press the

0630D
0816D

HE-800B

7. ADJUSTMENT

7-3. Adjusting the needle bar height
1.
2.
3.
4.

Press the THREAD key to switch to threading mode.
Press the
key.
Set the needle bar (1) to its lowest position.
Remove the rubber cap (2) from the face plate, and then
loosen the set screw (3) of the needle bar clamp.
5. Insert the “1” part of the gauge (4) between the needle
plate (5) and the lower edge of the needle bar (1), and
touch the needle bar against the gauge.
*

4878M

Different gauges (optional part) are used for each of
the two specifications -2 and -3, so make sure that the
gauge being used matches the specifications and
application for the sewing machine being adjusted.

6. Tighten the set screw (3).
7. Install the rubber cap (2).
8. Check that the cutter flank of the needle bar (1) is at a
right angle to the cutter.
9. Press the THREAD key.
Note:
If the installation positions are not correct, the needle
bar (1) and the cutter may touch when the needle
zigzags, which may result in noise or cause the needle
to break.

Cutter

4290Q

HE-800B

7. ADJUSTMENT

7-4. Adjusting the needle and hook timing
4879M

1.
2.
3.
4.

Press the THREAD key to switch to threading mode.
key.
Press the
Gently tilt back the machine head.
Loosen the knob screw (1), and then fully open the
slide cover (2).

5. Loosen the two screws (4) of the rotary hook joint (3).
6. Turn the pulley (5) in the regular direction of rotation
(A: toward the front) so that the needle bar (6) just
begins to rise from its lowest position.

4880M

7. Insert the “2” part of the gauge (7) between the needle
plate (8) and the lower edge of the needle bar (6), and
then align the rotary hook tip (9) with the center of the
needle when the needle bar (6) contacts the gauge
(7).
* Different gauges (optional part) are used for each of
the two specifications -2 and -3, so make sure that the
gauge being used matches the specifications and
application for the sewing machine being adjusted.
8. Tighten the two set screws (4) of the rotary hook joint
(3).
9. Close the slide cover (2), and then tighten the screw
(1) to secure it.
4881M

CAUTION
Close the slide cover (2) and secure it. The
inner pulley (5) rotates during sewing, so do
not touch it, otherwise injury may occur.

Mark

10. Gently return the machine head to its original position.
11. Press the THREAD key.

4882M

4883M

HE-800B

7. ADJUSTMENT

Needle plate thickness

Application

Gauge
S13595-001 Gauge 815-2

Clothing
(-2)
Knitted
wear

4294Q

S13596-001 Gauge 815-3

Knitted
wear
(-3)

4292Q

4295Q

S13597-001 Gauge 805-2

Thin knitted
wear

4293Q

4296Q

HE-800B

7. ADJUSTMENT

7-4-1. Adjusting the clearance between needle and hook tip
0.01 – 0.08 mm

2839Q

4884M

1.
2.
3.
4.

Press the THREAD key to switch to threading mode.
key.
Press the
Gently tilt back the machine head.
Loosen the screws (3) and move the rotary hook (4) forward or back until there is a clearance of 0.01 – 0.08 mm between the
needle (1) and the hook tip (2).
5. Gently return the machine head to its original position.
6. Press the THREAD key.

7-5. Adjusting the inner rotary hook and rotary hook holder overlap
1. Gently tilt back the machine head.
2. Loosen the two screws (3) to adjust so that the tip of
the rotary hook holder (1) does not protrude past the
edge A of the inner rotary hook (2).
3. Gently return the machine head to its original position.

3977Q

7-6. Adjusting the work clamp pressure
The standard distance A is 30 mm (approximately 30 N).
Loosen the nut (1) and turn the adjusting screw (2) to
adjust the work clamp pressure.

3978Q

HE-800B

7. ADJUSTMENT

7-7. Adjusting the work clamp lift amount

4297Q

4298Q

1. Turn on the power and set the sewing machine to the home position.
2. Check that memory switch No. 002 (Work clamp height when treadle is at neutral) is 10 mm. (If it is not set to 10 mm, set it
to 10 mm.)
3. Place a 10 mm gauge under the work clamp (1) and then loosen the set screw (2) to make the adjustment.
* Adjust the lift amount (including the play in the work clamp (1) and the pin (3) to 10 mm. If it is set to more than 10 mm, the
work clamp will start lifting before lower thread trimming is complete, which may result in thread trimming errors.
Furthermore, it may also cause the presser foot lifter pulse motor to go out of step.

HE-800B

7. ADJUSTMENT

7-8. Adjusting the work clamp lateral position

4299Q

4300Q

1. Loosen the set screw (1), and then move the feed arm (2) and the roller (3) to adjust so that the knife groove comes to the
center of the work clamp window.
2. Operate the treadle and check that the work clamp moves up and down smoothly.
* After adjusting, check the upper thread trimmer mechanism and adjust if necessary.

7-9. Adjusting the cutter home position sensor position
Loosen the screw (3), and then adjust the cutter sensor
setting plate (4) so that there is a clearance of 4.5 ±
0.5 mm between the side of the cutter sensor (1) and the
edge of the solenoid stopper (2).

4301Q

HE-800B

7. ADJUSTMENT

7-10. Adjusting the cutter installation position

Push

Fig. A

Pulled forward

Fig. B

0740D

4303Q

Adjust so that the upper thread scissors (2) and the cutter (1) do not touch when the cutter (1) is pushed down by hand.
If the upper thread scissors (2) extends below the cutter (1), pull the stop plate (3) forward and move the upper thread scissors
(2) to the left. (Fig. A → Fig. B)
4304Q

Touching

Cutter groove

4305Q

4306Q

1. Loosen the screw (5), and adjust the cutter Y direction using cutter holder DL (6) so that the clearance between the needle
bar (4) and the cutter (1) is 0.3 mm.
Note: ・When replacing the cutter, be careful not to allow the cutter to touch the needle bar because of any play in the
cutter installation position.
・Check that the needle bar (4) does not touch the cutter when it moves sideways.
2. Loosen the two bolts (7) and adjust the cutter X direction using cutter holder M (8) so that the cutter (1) goes into the center
of the cutter groove.
3. Loosen the bolt (9) and move the cutter holder (10) to adjust the direction of rotation.
4. Check that the edge of the cutter holder (10) is touching the stepped section of the cutter driving shaft (11), and then tighten
the bolt (9).
5. After adjusting, push the upper thread scissors (2) back to its original position (Fig. A).

HE-800B

7. ADJUSTMENT

7-10-1. When using the special needle plate (needle plate -RB)

4307Q

4308Q

The special needle plate is used to prevent the cutter from getting stuck in the material and not returning.
1. The special needle plate has a narrow cutter groove of 0.3 - 0.4 mm, so use the accessory positioning plate (1) to adjust the
cutter installation position.
Note: If this adjustment is not made, the cutter may touch the needle plate, and damage to the cutter may result.
2. Install the cutter holder (2) to minimize any play in the cutter during cutting.

7-11. Adjusting the cutter installation height

Lowest position
Lowest position

Top of needle plate

4309Q

1.5 - 2.0 mm

0687D

Adjust so that the upper thread scissors and the cutter do not touch when the cutter is pushed down by hand. (Fig. A → Fig. B
in “7-10. Adjusting the cutter installation position”)
Install the cutter with the screw (1) so that the tip A of the cutter blade is aligned with the top of the needle plate when the cutter
is pressed down by hand to its lowest position.
If using the flat cutter (2), install with the screw (1) so that there is a clearance of 1.5 - 2.0 mm between the cutter and the top of
the needle plate.
* After adjusting, push the upper thread scissors back to its original position (Fig. A in “7-10. Adjusting the cutter installation
position”).
Note: ・When the cutter is driven by the solenoid, the movement will be approximately 2 mm greater than that shown in
the illustration.
・If the cutter does not cut properly, the cutter may get stuck in the material and not return. If this happens, replace or
sharpen the cutter.

HE-800B

7. ADJUSTMENT

When the longitudinal feed
position has been changed

When the opening timing of the upper thread
scissors has been changed

When the gradual opening timing of the upper
thread scissors has been changed

When the installation height of the upper
thread scissors has been changed

When the cutting depth of the upper thread
scissors has been changed

When the longitudinal position of the upper
thread scissors has been changed

When the lateral position of the upper
thread scissors has been changed

When the trimmer driving arm position
has been changed

arm

When the home position position has
been changed

Upper thread trimming adjustment procedure

When adjusting for the first time

7-12. Adjusting the upper thread trimming

7-2-4. Work clamp (P) motor home position

0741D

7-12-1. Adjusting the longitudinal feed arm
assembly position

1772B

7-12-2. Adjusting the trimmer driving arm
assembly position

1773B

7-12-3. Adjusting the lateral position of the upper thread
scissors at the sewing start

4314Q

7-12-4. Adjusting the longitudinal position of the upper
thread scissors

4315Q

7-12-5. Adjusting the cutting depth of the upper thread
scissors

0798D

7-12-6. Adjusting the installation height of the upper thread
scissors

4317Q

7-12-7. Adjusting the upper thread scissors gradual
opening timing

1775B

7-12-8. Adjusting the upper thread scissors opening timing

4319Q

HE-800B

7. ADJUSTMENT
[CAUTION]
Before adjusting the upper thread trimming, check the home position of the work clamp (P) motor. (Refer to “7-2-4. Work
clamp (P) motor home position”.)

7-12-1. Adjusting the longitudinal feed arm assembly position
1. Turn on the power and set the sewing machine to the
home position. Then press the THREAD key to lower
the work clamp.
2. Check that the slot at the bottom of the upper thread
trimmer lever set (1) is aligned with the edge of the
washer (2).
3. If they are not aligned, loosen the bolt (3) and move
the longitudinal feed arm assembly (4) back and forth
to adjust.

Aligned

4320Q

7-12-2. Adjusting the trimmer driving arm assembly position

1776B

1777B

1. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
2. Check that the overlap between the stopper (2) fixed to the trimmer driving arm assembly (1) with the bolt and the stop plate
(4) of the upper thread trimmer lever set (3) is 1 mm.
3. If adjustment is necessary, loosen the bolt (5) and move the trimmer driving arm assembly (1) back and forward to adjust.

HE-800B

7. ADJUSTMENT

7-12-3. Adjusting the lateral position of the upper thread scissors at the sewing start

Approx. 1 mm

4323Q

1778B

1. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
2. Loosen the bolt (2), and then move the stopper (3) in and out to adjust so that the edge of the upper thread scissors
assembly (1) protrudes by approximately 1 mm from the center of the cutter.
Note: If the amount of protrusion of the upper thread scissors assembly is too great, the scissors may touch the needle
when they open.
3. After adjusting, carry out “7-12-8. Adjusting the upper thread scissors opening timing”.

7-12-4. Adjusting the longitudinal position of the upper thread scissors
1779B

Aligned

4326Q

1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm (1)
forward until the upper thread scissors assembly (2) is at the position shown in the illustration.
2. Loosen the two screws (3), and then move the upper thread scissors assembly (2) back and forward to adjust so that the
front ridge line of upper thread scissors U (4) is aligned with the edge of the needle hole.
Note: If this adjustment is not carried out, it may result in thread trimming errors or needle breakages.

HE-800B

7. ADJUSTMENT

7-12-5. Adjusting the cutting depth of the upper thread scissors
1779B

1780B

0 - 0.5 mm
0720D

1781B

1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm (1)
forward until the driving arm roller (3) is at its highest position on the cam A of the upper thread trimmer lever (2). (Upper
thread trimming position)
key while operating
* Using the output check code function can help with making this adjustment. If you press the panel
at check code No. 53, the presser lifter pulse motor will operate one step at a time. Refer to “3-8. Output
checking method”.
2. Loosen the bolt (9), and then adjust the driving arm roller (3) so that the clearance between the stopper (7) of the upper
thread scissors assembly (6) and the opening cam bracket (8) is 0 - 0.3 mm.
Note: If the stopper (7) is adjusted so that it presses too firmly, it may cause the presser foot lifter pulse motor to go out of
step.

HE-800B

7. ADJUSTMENT

7-12-6. Adjusting the installation height of the upper thread scissors
1779B

1782B

4332Q

4333Q

1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm (1)
forward until the driving arm roller (3) is at its highest position on the cam A of the upper thread trimmer lever (2).
2. Loosen the screw (4), and then move the upper thread scissors (5) up or down to adjust the clearance between the upper
thread scissors (5) and the work clamp (6) to approximately 1 mm.
Note:
The work clamp (6) will tilt when sewing joints, so adjust so that the upper thread scissors (5) do not touch it. If the upper
thread scissors touch the work clamp, a work clamp lifter pulse motor error may occur.
* If the tilting of the work clamp (6) causes skipped stitches to occur when sewing material joints, use the accessory
auxiliary sheet (7) as shown in the illustration.

HE-800B

100

7. ADJUSTMENT

7-12-7. Adjusting the upper thread scissors gradual opening timing
4104M

4105M

Start touching at 1.5 - 2.5 mm

Approx. 0.5 mm

4106M

1. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
2. Loosen the two bolts (3), and then adjust so that the distance b between ridge line B on the opening cam (1) and the upper
thread scissors (2) is 0.5 mm, and so that ridge line B on the opening cam is parallel to the feed direction.
3. Loosen the two screws (4), and then adjust so that the distance c between the rising section C of the upper thread scissors
(2) and the tip of the opening cam (1) is approximately 0.5 mm when the upper thread scissors (2) are closed.
* If you would like the scissors to start opening earlier, make the distance smaller. However, if you make the distance
smaller, check that the rising section C of the upper thread scissors (2) does not touch the opening cam (1) and prevent
the upper thread scissors (2) from opening when the work clamp is lowered.
4. Apply grease to the inclined face D of the opening cam (1).
5. Check that the upper thread scissors (2) gradually start opening after the material has been fed by 1.5 - 2.5 mm.

101

HE-800B

7. ADJUSTMENT

7-12-8. Adjusting the upper thread scissors opening timing
1786B

Approx. 2 mm

1787B

Feed arm

Approx.
1.0 - 1.5 mm

Approx. 1.0 - 1.5 mm

Approx. 2 mm

Approx. 1.0 - 1.5 mm

1788B

1. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
2. Loosen the two bolts (3), and then adjust the support plate (4) so that the back plate (1) and the cam (2) overlap by
approximately 1.0 - 1.5 mm.
Note: If the amount of overlap is too small, the upper thread scissors will not open properly and the upper thread scissors
and the cutter may touch each other.
3. Loosen the two bolts (5), and then adjust the clearance between the bend in the back plate (1) and the cam (2) to
approximately 2 mm.
* If you would like the scissors to start opening earlier, make this clearance smaller.
4. Check the operation in test feed mode.
* Refer to the operating procedure given in “5-9. Upper thread trimmer mechanism”.

HE-800B

102

7. ADJUSTMENT

7-12-9. Adjusting the overlapping amount of the upper thread scissors and the work clamp
Roller position
at step 4

Roller position
at step 2

0751D

1. Turn on the power, move the feed mechanism to the home position, and then press the THREAD key to lower the work
clamp and move the roller of the trimmer driving arm to the home position.
2. With the power turned off, move the feed arm forward by hand until the upper thread scissors begin to open, and then return
the feed arm to its position before it was moved.
3. Loosen the two screws (3) and move the adjusting plate (4) to set the distance A in the illustration so that the overlapping
amount B between the tip of the scissors D assembly (1) and the work clamp (2) is 1.0 mm to 1.5 mm. Then tighten the two
screws (3).
4. Next, with the power turned off, mote the trimmer driving arm forward by hand as far as it will go.
5. Once again loosen the two screws (3) and move the adjusting plate (4) to set the distance C in the illustration so that the
overlapping amount B between the tip of the scissors D assembly (1) and the work clamp (2) is 1.0 mm to 1.5 mm. Then
tighten the two screws (3).
* Make sure that the position (distance A) which was set in steps 1 and 2 does not change at this time.
6. Turn on the power, depress the treadle to move the feed mechanism to the home position, and then switch to test mode and
check that the scissors D assembly (1) is always overlapping the work clamp (2).

103

HE-800B

7. ADJUSTMENT

7-13. Adjusting the lower thread trimming
7-13-1. Adjusting the lower thread trimmer fixed knife engagement amount
Lower thread trimming complete

4342Q

Approx.
1 mm

4343Q

1. With the power turned off, move the lower thread trimmer cam lever (1) in the direction of the arrow so that the knife driving
lever (2) is in the position shown in the illustration.
2. Check that the cam A of the movable knife (3) is sitting securely on top of the cam B of the base plate (4).
3. Loosen the two screws (5), and then adjust so that the fixed knife (6) and the movable knife (3) are engaged by
approximately 1 mm.
* If the engagement amount is too small, the lower thread may not be fully cut, and the material may get caught when it is
removed after sewing.

7-13-2. Adjusting the lower thread retaining amount

Smaller
1 – 2 mm

Larger

4344Q

4345Q

1. Turn on the power and set the sewing machine to the home position.
2. Loosen the two screws (1), and then adjust the lower thread retainer (2) to a distance of 1 - 2 mm as shown in the
illustration.
* If the lower thread retaining amount has been reduced, check that the roller B of the lower thread clamp plate (3) is sitting
securely on top of the lower thread retainer cam A.
* If the lower thread is pulling up at the first stitch at the sewing start, check if the lower thread is not being pulled out of the
lower thread clamp plate (3), and that it is not too loose when it is coming out from the bobbin case.
If the lower thread retaining amount is too small
The lower thread will pull out of the lower thread clamp plate at the first stitch at the sewing start, which can cause problems
such as lower thread cast-off, lower thread loops or poor lower thread winding.
If the lower thread retaining amount is too great
This can cause problems such as poor sealing at the sewing start, or wound lower thread sticking out of the rear tack.

HE-800B

104

7. ADJUSTMENT

7-13-3. Adjusting the lower thread clamp opening timing
0752D

Approx.
6 – 7 mm

Sewing start

Lower thread winds around seam

Lower thread releases from
lower thread clamp

4347Q

1. Loosen the set screw (2) of the feed arm support (1), and then align reference line A of feed guide shaft B (3) with the edge
of the feed arm support (1).
2. When the feed mechanism moves by 6 - 7 mm, the opening plate (4) moves and the lower thread clamp (5) opens.
3. To change the opening timing, loosen the set screw (2) and move the feed guide shaft B (3) to the left or right to adjust.
* The end of the thread which is being held by the lower thread clamp (5) is wound around inside the seam. If the opening
timing is too early, it can cause problems such as poor winding or pulling-up of the lower thread. If the opening timing is
too late, it can cause problems such as stretching, uneven seams or bird’s nests at the sewing start, depending on the
type of material.

4348Q

4349Q

Note: After moving the lower thread trimmer cam lever (6) back in the direction of the arrow, move the feed mechanism.
If the feed mechanism is moved when the lower thread trimming has been carried out, the mechanisms will press
against each other, which may result in damage to the lower thread clamp (5) and the opening plate (4).

105

HE-800B

7. ADJUSTMENT

7-13-4. Adjusting the lower thread clamp opening amount
Loosen the two screws (6), and then adjust so that the
distance between the lower thread clamp (4) and the
lower thread presser (5) is approximately 5 mm when the
feed guide shaft (1) is projecting out at the front and is
firmly touching the roller (3) of opening plate (2).

Approx.
5 mm

4350Q

7-14. Adjusting the bobbin presser
4351Q

3989Q

4352Q

1. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
2. Loosen the set screw (1), and then adjust so that the bobbin presser (2) goes into the hole in the bobbin case (3).
3. Check that the work clamp is at the home position, and then loosen the nut (4) and turn the screw (5) to adjust the clearance
A between the bobbin presser (2) and the edge of the bed to approximately 12.5 mm.
4. Turn off the power, move the lower thread trimmer cam lever (6) by hand in the direction of the arrow to check that the
bobbin presser (2) presses the bobbin firmly before the lower thread retainer (7) starts to hold the lower thread.
Note: If this timing is reversed, it will cause problems such as an excess trailing length of upper thread.

HE-800B

106

7. ADJUSTMENT

7-15. Adjusting the thread breakage detector

Touching

Section B

Section A

4353Q

4354Q

1. Tighten the lever stopper (1) inside the slotted hole.
2. Loosen the screw (4), and then adjust so that the distance A at the thread guide (3) is 2 mm when the thread breakage
detector lever (2) contacts the lever stopper (1).
3. Loosen the screw (6) of the lever stopper (5), and then adjust so that the distance B at the thread guide (3) is 1 mm when
the thread breakage detection lever (2) contacts the stopper (5).

0.1 - 0.5 mm

Section C

4355Q

0743D

4. Loosen the screw (7), and then adjust so that the distance C at the balancer (8) is 4 mm.
5. Turn on the power and set the sewing machine to the home position. Then press the THREAD key to lower the work clamp.
6. Loosen the two screws (10), and then adjust so that the thread breakage detector sensor (9) turns on (LED illuminates)
when the distance between the thread breakage detection lever (2) and the lever stopper (1) is 1 mm.
7. When the thread guide (3) is moved to position B and then released, check that it moves smoothly back to position A.
8. If the thread guide (3) does not move smoothly, check that the clearance between the thread breakage detection lever (2)
and the arm is 0.1 - 0.5 mm.

107

HE-800B

7. ADJUSTMENT

7-16. Adjusting the thread tension at the tack tension control
1. Turn on the power and set the sewing machine to the
home position. Then press the THREAD key to lower
the work clamp.
2. Loosen the set screw (1), and then adjust the
clearances between the tension release cam (2) and
the tension release pin (3) as shown in the illustration.
3. Press the THREAD key and check that the tension disc
opening amount is 0.5 - 1.0 mm when the work clamp
is raised.
4. Press the THREAD key once more and check that the
tension discs are fully closed when the work clamp is
lowered.

0.3 - 0.5 mm

0.1 - 0.3 mm

0.5 - 1.0 mm

0744D

7-17. Adjusting the thread tension at the zigzag tension control
Position the tension release solenoid as described in "6-4.
Tension release mechanism (1)" before carrying out this
adjustment.
1. Turn on the power and set the sewing machine to the
home position. Then press the THREAD key to lower
the work clamp.
2. Loosen the set screw (1), and then move the tension
stud bracket assembly (2) in and out to adjust so that
the tension disc opening amount is 0.5 - 1.0 mm.
3. Check that the tension discs are fully closed when the
power is turned off.

0.5 - 1.0 mm

0745D

HE-800B

108

7. ADJUSTMENT

7-18. Adjusting the upper thread feeding amount

Decrease

Increase

0753D

1792B

1. Loosen the screw (1), and then turn the tension take-up lever (2) to adjust the upper thread feeding amount.
2. Move the trimmer driving arm (3) by hand and check that upper thread feeding is completed before the upper thread is cut.
Note: If the above adjustment is not made, it may result in the upper thread pulling out or in upper thread clamping errors.

7-19. Adjusting the rotary hook lubrication
4365Q

4364Q

To oil tank

Less

Less
4366Q

1. Remove the rubber cap (1).
2. Turn the adjusting screw (2) to adjust the lubrication amount.
* Adjust so that approximately 10 drops of oil are released when the sewing machine is run at a speed of 4,000 rpm for
three cycles to sew about 114 stitches. Use Kraft paper (3) or similar to catch the oil drops. As a guide, the optimum
position can be obtained if the adjusting screw (2) is tightened as much as possible and then loosened about two turns.
* Furthermore fine adjustments can then be made using the rotary hook joint screw (4).
* If the lubrication amount has been reduced, run the machine for 200 - 300 sewing cycles and then check it again.
Note: If lubrication stops, it will cause problems such as rotary hook seizure and thread breakages.

109

HE-800B

7. ADJUSTMENT

7-20. Adjusting the upper shaft motor reference position
1
2

Turn off the power and then remove the needle.
While pressing the
power switch.

and

key simultaneously, turn on the

Flashing
0763D

0821D

• The TEST indicator will flash and the upper shaft rotation
standby screen will be displayed.
Turn the pulley one full turn in the direction of the arrow.
• “PRESS ENTER AT STANDARD POINT” will be
displayed.

* If nothing is displayed, turn the pulley by hand until the
display appears.
0822D

Turn the pulley in the direction of the arrow to move the
needle bar until the distance A from the top of the needle
plate to the bottom edge of the needle bar is as given below.
-2 specifications: 43.2 mm
-3 specifications: 42.4 mm
A

0754D

End adjustment mode.

To confirm the reference position, press the ENTER key.
• “SUCCESSFUL COMPLETION” will be displayed for
1.5 seconds, and then the display will return to the
normal display and the sewing machine will change to
home position standby.
To exit without confirming the reference position, press the
TEST key.
• The display will return to the normal display and the
sewing machine will change to home position standby.

0823D

HE-800B

110

7. ADJUSTMENT

7-21. Standard settings for treadle depression stroke
The following procedure sets the operating positions for the treadle depression strokes to the standard values.

Enter the signal settings.

While pressing the

and

keys, turn on the power switch.

0739D

0824D

Store the maximum forward depression amount.

With the treadle depressed all the way forward, wait until the
voltage display value stabilizes and then press the ENTER
key.

0825D

Store the neutral position.

With your foot released from the treadle, wait until the voltage
display value stabilizes and then press the ENTER key.

0826D

Store the maximum backward depression amount.

With the treadle depressed all the way backward, wait until
the voltage display value stabilizes and then press the
ENTER key.

0827D

End the settings.

“SUCCESSFUL COMPLETION” will be displayed on the
screen.
NOTE:
If the operation of the treadle is incorrect, a buzzer will
sound.
Repeat the operation from step 2.
0828D

111

Turn off the power switch.

HE-800B

8. INSTALLING THE 3-PEDAL FOOT SWITCH (OPTION)

8. INSTALLING THE 3-PEDAL FOOT SWITCH (OPTION)
The foot switch conversion harness (SB1565001) that is sold separately is required.

DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before
opening the face plate of the control box. Touching areas where high voltages are present will result in serious injury
from electric shocks.
Be sure to connect the ground.
If the ground connection is not secure, you run a high risk of serious injury from electric shocks, and problems with
correct operation will also occur.

No.
1
2
3
4
5
6
7
8
9
10

3-pedal foot switch
10P connector
Start
0V
0V
Clamp
Option
0V

0764D

1. Insert the foot switch conversion harness (1) into connector on the main PCB.
2. Connect the connector (2) for the 3-pedal foot switch to the foot switch conversion harness (1).
3. Temporarily remove the screw (4) from the ground terminal of the control box, and then connect the two ground wires (3) in
the 3-pedal foot switch harness to the ground terminal and retighten the screw to the ground terminal.
4. Close the cord presser plate (5) in the direction of the arrow, and secure it by tightening the two screws (6).
NOTE:
・ Make sure that the ground connections are secure in order to ensure safety.
・ Close the cord presser plate (5) securely so that no foreign objects, insects or small animals can get inside the control
box.

HE-800B

112

9. ELECTRIC MECHANISM

9. ELECTRIC MECHANISM
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the face plate of the control box. Touching areas where high voltages are present will result in
serious injury from electric shocks.

9-1. Precautions at the time of adjustment
Pay attention to the following when opening the control box for maintenance.

Electric shock
Some large capacitors may have a high voltage remaining in them for up to 5 minutes after the power is turned off. To prevent
electric shock, wait at least 5 minutes after the power is turned off before doing the following:
• Opening and closing the control box
• Replacing fuses
• Separating and joining connectors
• Measuring resistance
• Doing anything with a possibility of touching something inside the control box
Some adjustments require measuring the voltage while the power is turned on with the control box kept open.
In such a case, be careful not to touch any place other than that for the measurement. In addition, always keep in mind that a
high voltage remains for about 5 minutes after power is turned off.
Injury
When separating or rejoining connectors, and measuring something, be careful not to cut your fingers on metal parts such as
heat sinks and covers.

113

HE-800B

9. ELECTRIC MECHANISM

9-2. Components inside and outside the control box and in the operation panel
Main PCB
Secured to the rear. This PCB drives the pulse motor and solenoids.
Motor PCB
Secured to the side. This PCB drives the main shaft motor. There are two fuses on this PCB.
Power PCB
Secured to the base. This PCB generates the voltages which are required for control operations.
Cutter PCB
Secured to the side. This PCB drives the solenoid.
Conversion transformer box (100V, 110V, 380V, 400V AC specifications only)
Steps-down the power supply voltage and generates the voltages that are required for the control box.
NF box (For Europe)
Eliminates electrical noise that is transmitted along the power supply line.
Panel PCB
Secured inside the operation panel. This PCB controls indications of the machine status and the input operation.

Control box

Operation panel
Motor PCB

Main PCB
Panel PCB

Cutter PCB

Transformer box

Power PCB
NF box

HE-800B

0765D

114

9. ELECTRIC MECHANISM

9-3. Fuse explanation
When replacing a fuse, be sure to use the specified ones listed below.
If a component on a PCB is damaged, the fuses may blow again soon even after they have been replaced.
No.
F1
F2

Part name
G Fuse 10A-250V
(glass tube fuse, 10A-250V)

Part code

When a fuse has blown

J04417-001

The power indicator is not illuminated, and
nothing operates.

Motor PCB

2930B

115

HE-800B

9. ELECTRIC MECHANISM

9-4. Connectors
Most of the machine trouble is due to connector problems including improper connection or sufficient contact. Therefore, be
sure to check if each connector is correctly inserted and that there is no contact failure between pins and wires before starting
troubleshooting procedures.

9-4-1. Connector positions
Main PCB

0830D

Motor PCB

(Refer to the diagram in “9-3. Fuse explanation”.)

HE-800B

116

9. ELECTRIC MECHANISM

Power PCB

0831D

Cutter PCB

0768D

LCD panel PCB

0769D

117

HE-800B

9. ELECTRIC MECHANISM

9-4-2. Contact failure
The connectors functions are divided into five categories. Some connectors may belong to more than one group. Be sure to
investigate another category if a problem is not found in one category.

Zigzag mechanism
Problem

Connector No. and position

• The needle bar does not move sideways during home position
detection immediately after the power is turned on.
• [E200] is displayed.

0832D

• The needle bar moves sideways but does not detect the home
position correctly.
• Problem with zigzag operation.
• [E200] or [E201] is displayed.

0833D

Feed mechanism
Connector No. and position

Problem
• The feed motor does not operate for home position detection
immediately after the power is turned on.
• Error E210 is displayed.

0834D

• The feed mechanism moves back and forth but does not detect
the home position correctly.
• Problem with feed plate operation.
• [E210] or [E211] is displayed.

0835D

HE-800B

118

9. ELECTRIC MECHANISM

Work clamp mechanism
Problem

Connector No. and position

• Work clamp does not move during home position detection
immediately after the power is turned on.
• [E300] is displayed.

0836D

• The work clamp moves up and down but does not detect the
home position correctly.
• Problem with work clamp operation.
• [E300] or [E301] is displayed.

0837D

Tension release mechanism
Problem

Connector No. and position

• Tension release does not operate (no error displayed).

0838D

Cutter mechanism
Problem

Connector No. and position

• Error E650 is displayed when the power is turned on.

0839D

• Cutter does not operate.
• [E651] is displayed.

0840D

119

HE-800B

9. ELECTRIC MECHANISM

Sewing operation
Problem

Connector No. and position

• The power indicator is not illuminated, and nothing operates.
• Machine operation is unstable.
• [E130] or [E131] is displayed.

0841D

• The main shaft motor does not operate correctly.
• Error E130 is displayed.

0842D

HE-800B

120

9. ELECTRIC MECHANISM

Others
Problem

Connector No. and position

• Panel indication is strange.
• The power indicator is not illuminated.
• Any operation panel key does not have any effect.

2944B

• The sewing machine does not operate when the foot switch is
depressed. (No error display.)

2945B

• After the power is turned on, [E015] or [E016] is displayed.

0843D

• Error E055 is displayed after the power is turned on.

0844D

• Error E452 is displayed after the power is turned on.

0845D

(Continued on next page.)

121

HE-800B

9. ELECTRIC MECHANISM

Others
Problem

Connector No. and position

• The WELCOME display does not disappear and the sewing
machine does not start.

2948B

• Only the power indicator illuminates.
• Nothing appears on the operation panel display.

2949B

• The sewing machine does not operate when the foot switch is
depressed.
• Error E130 is displayed.

0848D

• Error E131 is displayed.

0849D

HE-800B

122

9. ELECTRIC MECHANISM

9-5. Troubleshooting
9-5-1. Troubleshooting flowchart
Symbols and their meanings
Switch operation

Set-up operation
condition

Yes-or-no
decision-making process

The
procedure
to
follow continues on the
next page

The error status number
in the first column of the
table of “9-5-2. Problem
solution and measures”

Turning-off
of
power switch

the

2707B

0850D

123

HE-800B

9. ELECTRIC MECHANISM

0851D

HE-800B

124

9. ELECTRIC MECHANISM

0852D

125

HE-800B

9. ELECTRIC MECHANISM

0853D

HE-800B

126

9. ELECTRIC MECHANISM

9-5-2. Problem solution and measures

1. Pay attention to the following when opening the control box for maintenance.
Electrical shock
Some large capacitors may have a high voltage remaining in them for up to 5 minutes after the power is turned off.
To prevent electrical shock, wait at least 5 minutes after the power is turned off before doing the following:
• Opening and closing the control box
• Replacing fuses
• Separating and joining connectors
• Measuring resistance
• Doing anything with a possibility of touching something inside the control box
Some adjustments require measuring the voltage while the power is turned on with the control box kept open.
In such a case, be careful not to touch any place other than that for the measurement. In addition, always keep in
mind that a high voltage remains for about 5 minutes after power is turned off.
Injury
When separating or rejoining connectors, and measuring something, be careful not to cut your fingers on metal parts such
as heat sinks and covers.
2. When replacing a fuse, be sure to use a new one of the same quality and capacity as the old one.

Before adjustment
1. While the power is turned off, check each connector is securely plugged in by referring to “9-4. Connectors”.
2. Find the error status number in the troubleshooting flowchart.
3. From the applicable part of the flowchart, take the reference number to find the correspondingly numbered details of the
problem in the following table.

127

HE-800B

9. ELECTRIC MECHANISM

Error status

#1 The power indicator does not light when the power is turned on.

Probable causes
1. (Check the LEDs)

Check/ repair/ adjust
Turn on the power switch and check that the
various LEDs illuminate in the following order.
a. LD2 (red) on motor PCB does not illuminate.
→#1－2、#1－3、#1－4
b. LD2 (red) on power PCB does not illuminate.
→#1－5、#1－6、#1－7、#1－8
c. LD3 (green) on motor PCB does not
illuminate.
→#1－9
d. Power indicator on panel does not illuminate.
→#1－10

2. Malfunction of power cord

Turn off the power switch, disconnect the power
supply connector which links the power cord for
the power switch and the motor PCB, turn on the
power switch, and then measure the AC voltage
between terminals 1 and 3 of the cord-side
connector.

Parts to be replaced

OK if the voltage is the same as mains voltage.
In addition, check that the power supply voltage at
the wall outlet is within the range of the
specification voltage +/- 10%.
2712B

After inspecting, turn off the power switch and
connect the power supply connector.

3. Blown fuse

Turn off the power switch, wait 5 minutes or more,
and then remove fuses F1 and F2 on the motor
PCB and check their continuity.
OK if continuity

GFUSE10A-250V
(10A-250V)

4. Malfunction of motor PCB 1

Turn off the power switch, disconnect P2 (DCIN)
from the power PCB, and then turn on the power
switch and check LD2 (red) on the motor PCB.
OK if illuminated.

Motor PCB assembly 800B

After checking, turn off the power switch, wait for
five minutes or more, and then insert P2 into the
power PCB.
Turn the power switch back on, and then with P2
inserted into the power PCB, check the voltage
between terminals 1 and 3 of P2.
OK if 240 to 380 V DC.
5. Malfunction of power PCB

Turn off the power switch, disconnect connector
P1 (POWER2) from the main PCB and
connectors P4 (POWER3) and P6 (POWER2)
from the motor PCB, and then turn on the power
switch and check LD2 (red) on the power PCB.
OK if illuminated.

Power PCB assembly

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P4 and P6 into the motor PCB.
(Continued on next page.)

HE-800B

128

9. ELECTRIC MECHANISM

Error status

#1 The power indicator does not light when the power is turned on.

Probable causes
6. Malfunction of main PCB

Check/ repair/ adjust
Turn off the power switch, disconnect connector
P4 (POWER3) and P6 (POWER2) from the motor
PCB, and then turn on the power switch and
check LD2 (red) on the power PCB.
OK if illuminated.
(LD1 (red) on power PCB does not illuminate)

Parts to be replaced
Main PCB assembly 800B

After checking, turn off the power switch, wait for
one minute or more, and then insert P4 and P6
into the motor PCB.
7. Malfunction of main PCB 2

Turn off the power switch, disconnect connector
P1 (POWER2) from the main PCB and
connectors P1 (MT-ENC), P2 (MAIN) and P3
(PANEL) from the motor PCB, and then turn on
the power switch and check LD2 (red) on the
power PCB.
OK if illuminated.

Main PCB assembly 800B

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P1, P2 and P3 into the motor PCB.
8. Malfunction of panel PCB

Turn off the power switch, disconnect connector
P1 (POWER2) from the main PCB and
connectors P1 (MT-ENC) and P2 (MAIN) from the
motor PCB, and then turn on the power switch
and check LD2 (red) on the power PCB.
OK if illuminated.

LCD panel PCB assembly
Panel harness

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P1 and P2 into the motor PCB.
9. Poor harness connection

Turn off the power switch, check that connector
P4 (POWER3) is inserted into the motor PCB,
and then turn on the power switch and check the
voltage between terminals 1 and 4 of P4.
OK if approximately 24 V DC.

Power PCB assembly

Check that connector P3 (PANEL) of the motor
PCB is inserted.

Operation panel assembly
LCD panel PCB assembly
Panel harness

2713B

10. Malfunction of operation panel

129

HE-800B

9. ELECTRIC MECHANISM

Error status

#2 Error code appears on the display when the power is turned on.

Probable causes
1. If error E015 or E016 is displayed,
there is a poor connection of the
STOP switch.

2. If error E025, E035 or E045 is
displayed, the foot switch is still
depressed.

a.
b.
c.

Check/ repair/ adjust
Check that the STOP switch is not stuck
down.
Check if there is a harness short-circuit.
Check that connector P9 (HEAD-SW) is
inserted into the main P.C. board.

Parts to be replaced
STOP switch

a. Check if the foot switch is still depressed.
b. Check if there is a short-circuit in the harness.
c. Check if connector P12 (PEDAL) is connected
to the motor PCB.
d. Reset the depression stroke for the foot switch
while referring to “7-21. Standard setting for
depression stroke (foot switch)”.

Treadle unit

* For a 3-pedal foot switch, the connector for the
main PCB will be P15 (PEDAL).

3-pedal foot switch assembly

3. If "E055" is displayed, there is a
malfunction of the machine head
switch.

a. Check if the machine head switch is off.
b. Check if there is a broken wire in the harness.
c. Check if connector P14 (HEAD-SW) is
connected to the main PCB.

Switch assembly machine
head

4. If "E065" is displayed, one of the
keys on the operation panel is still
depressed.

a. Check that there is no incorrect sensitivity
when the surface of the panel sheet and the
keys are pressed.
b. Check that connector P3 (PANEL) is
connected to the motor PCB, and that
connector P1 (MAIN) is connected to the
panel PCB.

Operation panel assembly
LCD panel PCB assembly
Panel harness

5. If “E131” is displayed, there is a
poor
connection
of
the
synchronizer.

Check that connector P11 (RESOLVER) and P1
(MT-ENC) is connected to the motor PCB, and
that connector P6 (MT-ENC) is connected to the
main PCB.

6. If "E401" and "E410" is displayed,
there is a connection fault
between the main PCB, motor
PCB and the panel PCB.

a. Check LD3 (green) on the main PCB.
OK if illuminated.
b. Check LD3 (green) on the motor PCB.
OK if illuminated.
c. Check that connector P5 (MOTOR) is
connected to the main PCB, and that
connector P2 (MAIN) is connected to the
motor PCB.
d. Check that connector P3 (PANEL) is
connected to the motor PCB, and that
connector P4 (MAIN) is connected to the
panel PCB.
e. Check if there is a broken wire in the harness.

Main PCB assembly 800B
Motor PCB assembly 800B
LCD panel PCB assembly
Connection harness
Panel harness

(Continued on next page.)

HE-800B

130

9. ELECTRIC MECHANISM

Error status

#2 Error code appears on the display when the power is turned on.

7. If "E450" or "E452" is displayed,
the machine head memory cannot
be recognized.

a. Check if connector P3 (HEAD-M) is connected
to the main PCB.
b. Check if there is a broken wire in the harness.

8. If error E650 is displayed, there is
a poor connection of the cutter.

9. If "E700" is displayed, the power
supply voltage is abnormally high.

a. Check that the power supply voltage at the
mains is at the specification voltage plus or
minus 10%.
b. See #1-2.

10. If "E705" is displayed, the power
supply voltage is abnormally low.

a. Check that the power supply voltage at the
mains is at the specification voltage plus or
minus 10%.
b. See #1-2.

Error status

b.
c.

Check that connector P7（SENSOR2） is
inserted into the main P.C. board.
Check if there is a harness short-circuit.
Open the top cover and check the installation
of the cutter sensor.

#3 “Depress the treadle.” is not displayed when the power switch is turned on.

Probable causes
1. Main
software
not
correctly

installed

Check/ repair/ adjust
Carry out the restore operation by referring to
"4-11. Updating the control program version ".

2. Poor harness connection

Refer to inspections 9 and 10 in #1.

3. Malfunction of PCB

Check all of the LEDs while referring to step 1 in
#1, and then refer to inspections 5 to 8 in #1

131

Cutter sensor

HE-800B

Parts to be replaced
Operation panel assembly
Panel PCB assembly
Panel harness

9. ELECTRIC MECHANISM

Error status

#4 Work clamp does not return to home position during home position detection.

Probable causes
1. Incorrect
depression
adjustment

position

2. Malfunction of treadle unit

Check/ repair/ adjust
Adjust the position while referring to “7-21. Setting
method for standard depression strokes”.
With the motor PCB connector P12 (PEDAL)
connected, turn on the power and measure the
voltage between pins 3-4 of the cord connector
(No. 3 +, No. 4 -).

Parts to be replaced

Foot switch

OK if the voltage is approximately 2 V at neutral,
approximately 4 V when the foot switch is
depressed as far as it will go, and approximately
0.5 V when it is depressed backward.

2714B

3. Malfunction of foot switch and cord
(option)

(Check that the power is turned off.)
Disconnect the foot switch from the foot switch
adapter harness, and measure the voltage
between pins 5-6 and 7-8 of the foot switch
connector. (Check between pins 9-10 if using a
3-pedal foot switch.)

Foot switch

OK if the resistance is normally ∞ ohms but 0
ohms when depressed.

2956B

4. Malfunction of foot switch adapter
harness (option)

After checking the foot switch in step 3, connect
the foot switch adapter harness to the foot switch
and measure the voltage between pins 1-2 and
3-4 of connector P15 (PEDAL) of the main PCB.
(Check between pins 5-6 if using a 3-pedal foot
switch.)
(Touch the ohmmeter against the lead wires
without disconnecting the connector.)

Foot switch
Foot switch cord

OK if the resistance is normally ∞ ohms but 0
ohms when depressed.

2716B

HE-800B

132

9. ELECTRIC MECHANISM

Error status

#5 An error code is displayed during home position detection.

Probable causes
1. If error E130, E131, E132 or E133
is displayed, there is a poor
connection of the synchronizer.

Check/ repair/ adjust
Refer to inspection #2-4.

2. If error E130, E131, E132 or E133
is displayed, there is a poor
connection of the upper shaft
motor.

Check the connection of the relay connector
between the upper shaft motor and the motor
PCB.

3. If error E130, E131, E132 or E133
is displayed, there is a blown fuse.

a. Remove fuses F1 and F2 from the motor PCB
and check the continuity.
OK if there is continuity.

Parts to be replaced

GFUSE10A-250V
(10A-250V)

b. If fuses F1 and F2 are blown, check the
resistances between each of the pins of the
relay connector between the upper shaft
motor and the motor PCB, and between the
terminals of the fuses. OK if ∞Ω.

4. If error E130, E131, E132 or E133
is displayed, there is a malfunction
of the motor PCB.

133

c. If the fuses blow again after they are replaced,
replace the motor PCB.

Motor PCB assembly 800B

a. Check the synchronizer input while referring to
“3-7. Input checking method”.
OK if the signal turns on and off.

Resolver stator 800 assembly

b. If step a. (above) is OK, there is a malfunction
of the motor PCB.

Motor PCB assembly 800B

HE-800B

9. ELECTRIC MECHANISM

Error status

#6 An error code is displayed during home position detection.

Probable causes
1. If zigzagging does not occur and
error E200 is displayed, there is a
malfunction of the power PCB.

Check/ repair/ adjust
Disconnect connectors P1 (POWER2) and P24
(POWER1) from the main PCB, and then turn on
the power switch and check LD1 (red) on the
power PCB.
OK if illuminated.

Parts to be replaced
Power PCB assembly

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 and P24
into the main PCB.
2. If zigzagging does not occur and
error E200 is displayed, there is a
malfunction of the main PCB.

a. Disconnect connector P24 (POWER1) from
the main PCB, and check the continuity
between terminals 1 and 2 of P24.
OK if ∞ ohms.
b. Disconnect connector P21 (XPM) from the
main PCB, and check the continuity between
terminals 1 and 2, 3 and 4 of P21.
OK if ∞ ohms.
c. Insert P21 and P24 into the main PCB, turn on
the power switch and then check LD1 (red) on
the power PCB.
OK if illuminated.
If LD1 is illuminated during the check in step 1
but it does not illuminate when P1 and P24
are connected, there is a malfunction of the
main PCB.
d. Check LD1 (orange) on the main PCB.
OK if illuminated.

Main PCB assembly 800B

3. If zigzagging occurs slightly and
error E200 is displayed, there is a
malfunction of the encoder.

a. Check that connector P17 (X-ENC) is inserted
into the main PCB and that the color matches.

Pulse motor zigzag assembly
Main PCB assembly 800B

4. If zigzagging does not occur and
error E200 is displayed, there is a
malfunction of the pulse motor or
cord.

a. Disconnect the main PCB connector P21
(XPM) and measure the resistance between
pins 1-2 and 3-4 of the cord connector.
OK if 2-3 ohms.

Pulse motor zigzag assembly

b. If step a. (above) is OK, there is a malfunction
of the main PCB.

Main PCB assembly 800B

2717B
2718B

b. Check the encoder input while referring to
"3-7. Input checking method".

2719B

HE-800B

134

9. ELECTRIC MECHANISM

Error status

#7 An error code is displayed during home position detection.

Probable causes
1. If feeding does not occur and error
E210 is displayed, there is a
malfunction of the power PCB.

Check/ repair/ adjust
Disconnect connectors P1 (POWER2) and P24
(POWER1) from the main PCB, and then turn on
the power switch and check LD1 (red) on the
power PCB.
OK if illuminated.

Parts to be replaced
Power PCB assembly

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 and P24
into the main PCB.
2. If feeding does not occur and error
E210 is displayed, there is a
malfunction of the main PCB.

a. Disconnect connector P24 (POWER1) from
the main PCB, and check the continuity
between terminals 1 and 2 of P24.
OK if ∞ ohms.
b. Disconnect connector P22 (YPM) from the
main PCB, and check the continuity between
terminals 1 and 2, 3 and 4 of P22.
OK if ∞ ohms.
c. Insert P22 and P24 into the main PCB, turn on
the power switch and then check LD1 (red) on
the power PCB.
OK if illuminated.
If LD1 is illuminated during the check in step 1
but it does not illuminate when P1 and P24
are connected, there is a malfunction of the
main PCB.
d. Check LD1 (orange) on the main PCB.
OK if illuminated.

Main PCB assembly 800B

3. If feeding occurs slightly and error
E210 is displayed, there is a
malfunction of the encoder.

a. Check that connector P18 (Y-ENC) is inserted
into the main PCB and that the color matches.

Pulse motor feed assembly
Main PCB assembly 800B

4. If zigzagging does not occur and
error E210 is displayed, there is a
malfunction of the pulse motor or
cord.

a. Disconnect the main PCB connector P22
(YPM) and measure the resistance between
pins 1-2 and 3-4 of the cord connector.
OK if 2-3 ohms.

Pulse motor feed assembly

b. If step a. (above) is OK, there is a malfunction
of the main PCB.

Main PCB assembly 800B

2717B
2720B

b. Check the encoder input while referring to
"3-7. Input checking method".

2721B

135

HE-800B

9. ELECTRIC MECHANISM

Error status

#8 An error code is displayed during home position detection.

Probable causes
1. If the work clamp pulse motor
does not operate and "E300" is
displayed, there is a malfunction of
the power PCB.

Check/ repair/ adjust
Disconnect connectors P1 (POWER2) and P24
(POWER1) from the main PCB, and then turn on
the power switch and check LD1 (red) on the
power PCB.
OK if illuminated.

Parts to be replaced
Power PCB assembly

After checking, turn off the power switch, wait for
one minute or more, and then insert P1 and P24
into the main PCB.
2. If the work clamp pulse motor
does not move and "E300" is
displayed, there is a malfunction of
the main PCB.

a. Disconnect connector P24 (POWER1) from
the main PCB, and check the continuity
between terminals 1 and 2 of P24.
OK if ∞ ohms.
b. Disconnect connector P23 (PPM) from the
main PCB, and check the continuity between
terminals 1 and 2, 3 and 4 of P23.
OK if ∞ ohms.
c. Insert P23 and P24 into the main PCB, turn on
the power switch and then check LD1 (red) on
the power PCB.
OK if illuminated.
If LD1 is illuminated during the check in step 1
but it does not illuminate when P1 and P24
are connected, there is a malfunction of the
main PCB.
d. Check LD1 (orange) on the main PCB.
OK if illuminated.

Main PCB assembly 800B

3. If the work clamp pulse motor
moves slightly and "E300" is
displayed, there is a malfunction of
the encoder.

a. Check that connector P19 (P-ENC) is inserted
into the main PCB and that the color matches.

Pulse motor work clamp
assembly
Main PCB assembly 800B

4. If the work clamp pulse motor
does not move and "E300" is
displayed, there is a malfunction of
the pulse motor and cord.

a. Disconnect the main PCB connector P23
(PPM) and measure the resistance between
pins 1-2 and 3-4 of the cord connector.
OK if 2-3 ohms.

Pulse motor work clamp
assembly

b. If step a. (above) is OK, there is a malfunction
of the main PCB.

Main PCB assembly 800B

2717B
2722B

b. Check the encoder input while referring to
"3-7. Input checking method".

2723B

HE-800B

136

9. ELECTRIC MECHANISM

Error status

#9 Work clamp does not rise during home position detection.

Probable causes
1. Incorrect work clamp home position
adjustment

Check/ repair/ adjust
a. Adjust the home position while referring to
"7-2. Adjusting the home position".

Parts to be replaced

b. Check if the work clamp is touching something
else.
2. Incorrect mechanism adjustment

Error status

Check if the work clamp mechanism, upper
thread trimming mechanism and lower thread
trimming mechanism are moving stiffly.

#10 Work clamp does not drop during threading mode.

Probable causes
1. Incorrect work clamp home position
adjustment

Check/ repair/ adjust
a. Adjust the home position while referring to
"7-2. Adjusting the home position".

Parts to be replaced

b. Check if the work clamp/button clamp is
touching anything.
2. Incorrect mechanism adjustment

Error status

#11

The THREAD indicator does not illuminate during threading mode.

Probable causes
Malfunction of panel PCB

Error status

#12

Check if the work clamp mechanism, upper
thread trimming mechanism and lower thread
trimming mechanism are moving stiffly.

Check/ repair/ adjust
Check that connector P3 (PANEL) is connected to
the motor PCB, and that connector P1 (MAIN) is
connected to the panel PCB.

Zigzagging does not move slowly one stitch at a time during test feeding.

Probable causes
1. Malfunction of foot switch and cord

See #4.

2. Malfunction of zigzag mechanism

See #6.

Error status

#13

Check/ repair/ adjust

Parts to be replaced

The feed mechanism does not move slowly one stitch at a time during test feeding.

Probable causes
1. Malfunction of foot switch and cord

See #4.

2. Malfunction of feed mechanism

See #7.

137

Parts to be replaced
LCD panel PCB assembly
Panel harness

Check/ repair/ adjust

HE-800B

Parts to be replaced

9. ELECTRIC MECHANISM

Error status

#14

Feeding and zigzagging do not move continuously during test feeding.

Probable causes
Malfunction of foot switch and cord

See #4.

Check/ repair/ adjust

Parts to be replaced

Error status #15 Tension release does not operate during test feeding.
Probable causes
1. Poor connector connection
2. Malfunction
solenoid

tension

release

Check/ repair/ adjust
Check that main PCB connector P2 (SOL1) and
P3 (SOL2) is connected.
Disconnect main PCB connector P3 (SOL2) and
measure the resistance between pins 1-2 of the
cord connector.
OK if 6-8 ohms.

Parts to be replaced
Tension release solenoid

Main PCB assembly 800B

2727B

3. Malfunction of main PCB.

Turn on the power switch and check LD2
(green) on the main PCB.
OK if illuminated.
With connector P3 (SOL2) disconnected from
the main PCB, check the continuity between
terminals 1 and 2 of connector P3 on the
main PCB.
OK if ∞ ohms.
With main PCB connector P3 (SOL2)
connected, turn on the power and carry out
sewing, and measure the voltage between
pins 1-2 of connector P3 (SOL2).
OK if there is voltage output momentarily
after sewing stops.

0651D

HE-800B

138

9. ELECTRIC MECHANISM

Error status

#16

Upper shaft motor does not operate during sewing.

Probable causes
1. If “E111”, “E130”, “E131”, “E132” or
“E133” is displayed after the
sewing machine operates, there is
a
poor
connection
of
the
synchronizer.

Check/ repair/ adjust
Check that connectors P11 (RESOLVER) and P1
(MT-ENC) of the motor PCB and connector P6
(MT-ENC) of the main PCB are inserted.

2. If error E111, E130, E131, E132 or
E133 is displayed after the sewing
machine operates, there is a poor
connection of the upper shaft
motor.

Check the connection of the relay connector
between the upper shaft motor and the motor
PCB.

3. If “E111”, “E130”, “E131”, “E132” or
“E133” is displayed after the
sewing
machine
operates,
interference is causing operating
errors.

Check that the ground wire is securely connected
and that the sewing machine is not close to any
equipment that generates strong electrical
interference.

4. If “E111”, “E130”, “E131”, “E132” or
“E133” is displayed after the
sewing machine operates, there is
a malfunction of the motor PCB.

Refer to steps 1 to 4 in #5.

Resolver stator assembly
Motor PCB assembly 800B

5. If error E111, E130, E132 or E133
is displayed after the sewing
machine operates, there is a
malfunction of the motor PCB or of
the upper shaft motor.

If an error occurs after inspection steps 1 to 4
above have been carried out, there is a
malfunction of the machine motor.

Motor 800 assembly

6. If "E121" is displayed after the
sewing machine operates, there is
a malfunction of a component.

1） If the area around the motor is not warm,
refer to inspections 1 to 5 in #16.

Resolver stator 800 assembly
Motor PCB assembly 800B
Motor 800 assembly

2） If the area around the motor is warm, turn the
pulley by hand and check that it is not stiff. If
it is stiff, adjust while referring to “6-8. Upper
shaft and tension pulley mechanisms”. If it is
not stiff, there is a malfunction of the machine
motor.

139

HE-800B

Parts to be replaced

9. ELECTRIC MECHANISM

Error status

#17

Upper shaft motor does not operate during sewing.

Probable causes
1. Poor connector contact

Check/ repair/ adjust
Check that connector P31 (CUTTER) is inserted
into the main PCB, that connectors P1 (POWER),
P2 (SOL) and P3 (MAIN) are inserted into the
cutter PCB, and that connector P5 (CUTTER) is
inserted into the power PCB.

Parts to be replaced

2. Malfunction of cutter solenoid

Disconnect connector P2 (SOL) from the cutter
PCB, and measure the resistances between pins
1 and 3 and pins 2 and 4 of the cord-side
connector.
OK if 6Ω to 8Ω between 1 and 3, and 13Ω to 15Ω
between 2 and 4.

Cutter solenoid assembly

Turn off the power switch, disconnect
connector P2 (SOL) from the cutter PCB, and
then check the continuity between terminals
1 and 3 and terminals 2 and 4 of connector
P2 on the cutter PCB.
OK if ∞Ω

Cutter PCB assembly

Insert connector P2 (SOL) into the cutter
PCB, turn on the power switch and carry out
sewing, and measure the voltages between
terminals 1 and 3 and terminals 2 and 4 of
connector P2.
OK if voltage is output momentarily at the
sewing end.

0780D

3. Malfunction of cutter PCB

0781D

HE-800B

140

9. ELECTRIC MECHANISM

Error status

#18

Needle bar does not stop at the needle up position (“UP” is frequently displayed after sewing)

Probable causes
1. Incorrect adjustment
2. Problem with upper shaft motor
operation

Error status

#19

Check/ repair/ adjust
Adjust while referring to "7-2. Adjusting the home
position”.
Refer to steps 1 to 5 in #16

Parts to be replaced
Resolver stator 800 assembly
Motor PCB assembly 800B
Motor 800 assembly

SD card read/write mode cannot be activated.

Probable causes
1. If error E422 or E425 is displayed,
the SD card is inserted incorrectly.

Check/ repair/ adjust
a. Check the direction of insertion of the SD
card.
(Insert the card so that it matches the direction
of the pattern on the card cover.)

Parts to be replaced

b. Check the insertion of the SD card.

2650B

2. If “E424” is displayed, the SD card
is incorrectly formatted.

Check the format of the SD card.
(Carry out 16-sector formatting.)

3. Malfunction of SD card

Use a PC to check if the contents of the SD card
can be read.

4. Malfunction of operation panel

See #12.

141

LCD panel PCB assembly
Panel harness

HE-800B

10. TABLE OF ERROR CODES

DANGER

Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before
opening the control box cover. Touching areas where high voltages are present will result in serious injury from
electric shocks.
If a problem should occur with the sewing machine, the buzzer will sound and an error code and error message will appear in
the display.
Follow the remedy procedure to eliminate the cause of the problem.

Flashing

4933M

Switch-related errors
Code

Cause

Remedy

E010

Stop switch was pressed during standby.

Remove your finger from the stop switch (so that it is off).

E011

Stop switch was pressed during sewing.

Press the RESET key to clear the error.
* Press the
key to move the needle and the work
clamp so that you can continue sewing.
* If not continuing sewing, press the RESET key once
more.

E012

Stop switch was pressed while sewing
machine was operating other than during
sewing.

Press the RESET key to clear the error.
(Home position detection will be carried out automatically.)

E015

The stop switch was still pressed when
the power was turned on, or there is a
problem with the stop switch connection.

Turn off the power and check the connection of the stop
switch connector P9 at the main P.C. board.

E016

Problem with the stop switch connection.

Turn off the power and check the connection of the stop
switch connector P9 at the main P.C. board.

E025

Treadle was still depressed to the 2nd
step when the power was turned on, or
treadle connection is faulty.
(Start switch if a triple pedal is being used)

Turn off the power, and then check that connector P12 on
the motor P.C. board is properly connected. (Connector
P15 on the main P.C. board if a triple pedal is being used)

E035

Treadle was still depressed to the 1st step
when the power was turned on, or treadle
connection is faulty.
(Work clamp switch if a triple pedal is
being used)

Turn off the power, and then check that connector P12 on
the motor P.C. board is properly connected. (Connector
P15 on the main P.C. board if a triple pedal is being used)

E045

Treadle was still depressed backward
when the power was turned on, or treadle
connection is faulty.
(Work clamp lifter switch if a triple pedal is
being used)

Turn off the power, and then check that connector P12 on
the motor P.C. board is properly connected. (Connector
P15 on the main P.C. board if a triple pedal is being used)

HE-800B

142

10. TABLE OF ERROR CODES

Code

Cause

Remedy

E050

Machine head tilting was detected
immediately before the sewing machine
started operating.

Turn off the power, and then return the machine head to its
original position.
Check that safety switch connector P14 on the main P.C.
board is properly connected.

E051

Machine head tilting was detected while
the sewing machine was operating.

Turn off the power, and then return the machine head to its
original position.
Check that safety switch connector P14 on the main P.C.
board is properly connected.

E055

Machine head tilting was detected when
the power was turned on.

Turn off the power, and then return the machine head to its
original position.
Check that safety switch connector P14 on the main P.C.
board is properly connected.

E065

An operation panel key was still being
pressed when the power was turned on,
or key is faulty.

Turn off the power and check the operation panel.

Upper shaft motor-related errors
Code

Cause

Remedy
Turn off the power, and then open the slide cover. Align
the mark (A) on the pulley within the edges of the mark (B)
on the motor cover.

E110

Pulley is not in needle up stop position
during standby when work clamp is
lowered.

E111

The sewing machine could not stop
correctly at the needle up stop position
after sewing.

Turn off the power, and then check that there are no
problems with the cutter mechanism, the thread trimming
mechanism and the upper shaft motor mechanism.

E112

The needle bar dropped during home
position detection or while the SD card
was being accessed.

Turn off the power, and then turn it back on again.
* If this error occurs when the work clamp is not lowered,
the work clamp will drop automatically in order to
prevent interference between the needle and the lower
thread retainer.

E113

Pulley is not in needle up stop position
during standby when work clamp is not
lowered.

Turn off the power, and then open the slide cover. Align the
mark (A) on the pulley within the edges of the mark (B) on
the motor cover. (Refer to the diagram for “E110” above.)
* If this error occurs, the work clamp will drop
automatically in order to prevent interference between
the needle and the lower thread retainer.

E130

Upper shaft motor stopped due to a
problem, or synchronizer is faulty.

Turn off the power, and then open the slide cover. Turn
the pulley to check if the machine has locked up.
Check that the upper shaft motor 4-pin (UVW) connector
and synchronizer connector P11 on the motor P.C. board
are properly connected.

E131

Synchronizer is not connected correctly.

Turn off the power, and then check that synchronizer
connector P11 on the motor P.C. board is properly
connected.

143

HE-800B

10. TABLE OF ERROR CODES

Code

Cause

Remedy

E132

Problem detected with upper shaft motor
operation.

Turn off the power, and then check that synchronizer
connector P11 on the motor P.C. board is properly
connected.

E133

Upper shaft motor stopping position is
incorrect. (During automatic needle lifting)

Turn off the power, and then check that synchronizer
connector P11 on the motor P.C. board is properly
connected.

E150

Upper shaft motor is overheating, or
temperature sensor is faulty.

Turn off the power, and then check the upper shaft motor.

Feed mechanism-related errors
Code

Cause

Remedy

E200

Needle zigzag motor home position
cannot be detected.
Needle zigzag motor, needle zigzag
sensor or needle zigzag encoder signal is
not connected correctly.

Turn off the power, and then check that the needle zigzag
sensor and needle zigzag encoder connector P17 and the
needle zigzag motor connector P21 on the main P.C.
board are properly connected.

E201

Needle zigzag motor stopped due to a
problem.

Turn off the power, and then check if there are any
problems in the needle zigzag direction.

E210

Feed motor home position cannot be
detected.
Feed motor, feed sensor or feed encoder
signal is not connected correctly.

Turn off the power, and then check that the feed sensor
connector P8, feed encoder connector P18 and feed
motor connector P22 on the main P.C. board are properly
connected.

E211

Feed motor stopped due to a problem.

Turn off the power, and then check if there are any
problems in the feed direction.

Work clamp-related errors
Code

Cause

Remedy

E300

Work clamp motor home position cannot
be detected.
Work clamp motor, work clamp sensor or
work clamp encoder signal is not
connected correctly.

Turn off the power, and then check that the work clamp
sensor and work clamp encoder connector P19 and the
work clamp motor connector P23 on the main P.C. board
are properly connected.

E301

Work clamp motor stopped due to a
problem.

Turn off the power, and then move the work clamp up and
down and check that it moves smoothly.

HE-800B

144

10. TABLE OF ERROR CODES
Communication and memory-related errors
Code

Cause

Remedy

E401

Communication error detected between
the main P.C. board and the motor P.C.
board when the power was turned on.

Turn off the power, and then check that connector P5 on
the main P.C. board and connector P2 on the motor P.C.
board are properly connected.

E410

Communication error detected between
the main P.C. board and the panel P.C.
board.

Turn off the power, and then check that connector P4 on
the panel P.C. board and operation panel connector P3 on
the motor P.C. board are properly connected.

E411

Communication error detected between
the main P.C. board and the motor P.C.
board.

Turn off the power, and then check that connector P5 on
the main P.C. board and connector P2 on the motor P.C.
board are properly connected.

E422

An error occurred while reading from the
SD card.

Press the RESET key to clear the error.
Check the data on the SD card.

E424

Insufficient free space on the SD card.

Press the RESET key to clear the error.
Use a different SD card.

E425

An error occurred while writing to the SD
card.

Press the RESET key to clear the error.
Check if the media is write-protected and if it has enough
free space.

E430

Problem with flash memory on main P.C.
board.

Turn the power off and then back on again.

E440

Problem with EEPROM on main P.C.
board.

Turn the power off and then back on again.

E450

Model selection cannot be read from the
machine head memory.

Turn off the power, and then check that the correct
machine head memory is connected.
Check that the machine head memory connector P16 on
the main P.C. board is properly connected.

E452

Machine head memory is not connected.

Turn off the power, and then check that machine head
memory connector P16 on the main P.C. board is properly
connected.

E453

Problem with machine head memory.

Turn the power off and then back on again.

[P.C. board and connector positions]

Main P.C. board

Motor P.C. board

Panel P.C. board

4887M

145

HE-800B

4888M

10. TABLE OF ERROR CODES
Software-related errors
Code

Cause

E512

Maximum number of stitches for a single
program (999 stitches) exceeded.

E582
E583

Error in memory switch version detected.
Error in parameter data version detected.

Remedy
When the power is turned off and then back on, the
zigzag pitch will be set automatically to x1.5 in order to
reduce the number of stitches.
Turn off the power and carry out level 2 initialization.
Turn off the power and carry out level 1 initialization.

Device-related errors
Code

Cause

Remedy

E600

Upper thread breakage occurred.

Thread the upper thread, and then press the RESET key
to clear the error.
* Press the
key to move the needle and the work
clamp so that you can continue sewing.
* If not continuing sewing, press the RESET key once
more.

E650

Cutter is not at home position.
(Cutter is lowered.)

Turn off the power, and then check if there are any
problems with the cutter mechanism.
Check that cutter solenoid connector P2 on the cutter P.C.
board is properly connected.

E651

Cutter has not operated.
(Does not drop.)

Turn off the power, and then check that cutter sensor
connector P7 on the main P.C. board and cutter solenoid
connector P2 on the cutter P.C. board are properly
connected.

P.C. board-related errors
Code

Cause

Remedy

E700

Abnormal rise in power supply voltage.

Turn off the power and check the input voltage.

E701

Abnormal rise in upper shaft motor drive
voltage.

Turn off the power, and then check the voltage.

E705

Abnormal drop in power supply voltage.

Turn off the power and check the input voltage.

E710

Abnormal current detected in upper shaft
motor.

Turn off the power, and then check if there are any
problems with the upper shaft motor.

E711

Abnormal current detected in pulse motor.

Turn off the power, and then check if there are any
problems with the pulse motor.

HE-800B

146

10. TABLE OF ERROR CODES
Version updating errors
Code

Cause

Remedy

E870

No control program for the operation
panel is present.

Load the control program for the operation panel from the
SD card.

E880

Version update requests cannot be
received.

Turn off the power, and then check that there are no
problems with the wiring and the P.C. boards inside the
control box.

E881

Communication error was detected during
version update.

Turn off the power, and then repeat the version update
procedure.
If the error continues to occur, turn off the power, and then
check that there are no problems with the wiring and the
P.C. boards inside the control box.

E883

No control program is present on the SD
card.

Check that the control program has been saved into the
correct folder.

E884

There is a problem with the control
program.

Write the correct file onto the SD card.

E885

Writing of the control program cannot
begin.

Turn off the power, and then check that there are no
problems with the wiring and the P.C. boards inside the
control box which are to have their firmware versions
updated.

E886

Data error occurred during writing of the
control program.

Turn off the power, and then check that there are no
problems with the wiring and the P.C. boards inside the
control box which are to have their firmware versions
updated.

E887

Error occurred during writing of the control
program.

Turn off the power, and then check that there are no
problems with the wiring and the P.C. boards inside the
control box which are to have their firmware versions
updated.

If an error code that is not listed above appears or if carrying out the specified remedy does not solve the problem,
contact the place of purchase.

147

HE-800B

11. TROUBLESHOOTING

11. TROUBLESHOOTING
• Please check the following points before calling for repairs or service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.

CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the
machine may operate if the treadle is depressed by mistake, which could result in injury.

11-1. Upper thread breakage
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Needle
Needle facing
As viewed from the direction of the face plate, attach
the needle so that the groove of the needle faces
frontward.
Needle installation height
Insert the end of the needle shank so that it touches
the top edge of the needle hole of the needle bar.
Bent needle
Replace needle.
Blunt needle tip or burr
Replace needle.
Needle and thread
Replace needle that fits the thread.
Threading
Upper thread threading
Thread the upper thread correctly.

Thread path

Lower thread threading

Thread the lower thread correctly.

Flaw or abrasion on the
thread path

Polish with buff or replace the part.
Especially, pay attention to finishing around needle
plate hole.

Page
91
–
–
–
–
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

–

Needle plate hole

Flaw on the rotary hook tip
and rotary hook edge
Flaw on the rotary hook
holder

3996Q

Polish with buff or replace the part.

–

Polish with buff or replace the part.
Check flaw here
Adjust the rotary hook
overlap amount.

3997Q

Thread tension

Thread take-up spring

Zigzag thread upper thread
tension
Bar tack thread upper
thread tension
Thread take-up
tension and height

spring

Adjust the upper thread tension appropriately.
Adjust the upper thread tension while checking
stitches. (The stitches on top are the upper thread and
the stitches underneath are the bobbin thread.)
Loosen the thread take-up spring tension or lower the
height to such a degree that does not cause double
hooking. Adjust it while checking bar tacking stitches.

INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

(Continued on next page)

HE-800B

148

11. TROUBLESHOOTING

Cause
Rotary hook

Check
Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
Gap between the needle
and the tip of the rotary
hook

Rotary hook lubrication

Remedy
1. Adjust the needle bar height to “1” on the gauge.
2. Adjust the needle and rotary hook timing to “2” on
the gauge.
Adjust the gap between the needle and the rotary hook
tip to 0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Move the needle bar to the left and right with your
finger, and check that the tip of the rotary hook does
not strike the needle.
・Too small quantity of lubrication oil will cause thread
breakage. Adjust the quantity of lubrication oil.
・The lubrication holes (1) between rotary hook and
rotary hook joint do not match up.

Page
88
89

109
81

4894M

Upper thread amount
Bobbin case

Thread twisted around
rotary hook
Arm thread guide position

Remove any twisted thread from the inner and rotary
hook.
Adjust the arm thread guide position.

Damaged
outside
of
bobbin case and bent
bobbin holder spring, etc.

Polish with buff or replace the part.
* Use the HE-800B bobbin case.

–
INSTRUCTION
MANUALCD

–

11-2. Skipped stitches
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Needle
Needle facing
As viewed from the direction of the face plate, attach
needle so that the groove of the needle faces
frontward.
Needle installation height
Insert the end of the needle shank so that it touches
the top edge of the needle hole of the needle bar.
Bent needle
Replace needle.
Blunt needle tip or burr
Replace needle.
Thin needle
Use a needle with a count that matches the thread and
material.
Thread take-up spring Thread take-up spring Loosen the thread take-up spring tension or lower the
height to such a degree that does not cause double
tension and height
hooking. Adjust it while checking bar tacking stitches.

Page
91
–
–
–
–
INSTRUCTION
MANUALCD

(Continued on next page)

149

HE-800B

11. TROUBLESHOOTING

Cause
Work clamp

Check
Work clamp pressure
Relation between
clamp
assembly
sewing length

Rotary hook

Thread tension
Needle bar play
Lower thread clamp

work
and

Blunt rotary hook tip
Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
Gap between the needle
and the tip of the rotary
hook

Zigzag thread upper thread
tension
Vertical and longitudinal
needle bar play
Lower thread retainer cam

Remedy
Increase work clamp pressure.
* The standard height of the adjustment screw is
approximately 30 mm, so tighten it further than this.
・Replace work clamp assembly that fits for sewing
length.
・When using knits or woven materials, replace the
parts with the -3 specification parts:
Length feed plate (for specification -3), work clamp
assembly (for knits), needle plate 1.2 (for
specification -3)
Polish with buff or replace the part.
1. Adjust the needle bar height to “1” on the gauge.
2. Adjust the needle and rotary hook timing to “2” on
the gauge.
Adjust the gap between the needle and the rotary hook
tip to 0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Move the needle bar to the left and right with your
finger, and check that the tip of the rotary hook does
not strike the needle.
Adjust the upper thread tension appropriately.
Reduce the needle bar play, or replace the parts.

Page
91

–

–
89

INSTRUCTION
MANUALCD

–

Lower thread retainer cam should be sitting firmly on
lower thread clamp plate roller.
Cam
Roller

104

3998Q

Thread scraps and dust
blocking area around lower
thread clamp and lower
thread presser
Lower thread clamping
force

Clean around the lower thread presser.
–
・If the lower thread clamp and lower thread presser
are bent, replace them.
・Check that the screws are tightened.
Screw

–
Lower thread
clamp
3999Q

Needle plate

Joint sewing

Relation between material
and needle plate

Angle of work clamp
means that material is not
being clamped.

・When using knit material, replace with the -3 needle
plate.
・Replace with a needle plate with a smaller needle
hole.
・Replace with short work clamp that matches the
sewing length.
・Use the accessory auxiliary sheet.
・Process the work clamp assembly to match the joint
section. (Attach or remove rubber.)

HE-800B

–

–
100
–

150

11. TROUBLESHOOTING

11-3. Uneven seams (1) …… At the sewing start
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Installation height
Adjust the upper thread trimmer installation height.
Upper
thread
trimmer Adjust to an appropriate opening timing.
opening timing
Upper
thread
trimmer Apply grease to the inclined face of the opening cam.
operation
Upper thread feeding
Thread take-up amount
Loosen the screw to decrease thread take-up amount
so that upper thread does not pull out of trimmer
assembly at the sewing start.

Decrease

Increase

Screw

Page
100
101
101

109

4000Q

Lower thread (bobbin
slip)

Lower thread tension

Adjust the lower thread tension appropriately.

Bobbin holder spring

Add tension to the bobbin holder spring.

INSTRUCTION
MANUALCD

Add tension to the spring by the same
amount that the bobbin tab is projecting.

–

Make a gap

4001Q

Lower
thread
position

retainer

Adjust the lower thread retainer position.
* Adjust lower thread retainer so that a 35 - 40 mm
thread leader is left after trimming.
104
35 – 40 mm
4002Q

Bobbin presser position
Bobbin insertion

151

Adjust the bobbin presser position.
Insert the bobbin correctly.

HE-800B

106
INSTRUCTION
MANUALCD

11. TROUBLESHOOTING

11-4. Uneven seams (2) …… Lower thread is lifted up at the sewing start
The end of the lower thread protrudes above the seam at the sewing start
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Lower thread retainer
Lower thread retaining Adjust the lower thread retaining amount.
amount

Page

104

4003Q

Lower thread clamp

Lower
thread
clamp
opening timing
Lower thread clamping
force

Adjust so that the lower thread clamp plate opens
when the feed mechanism moves 6 - 7 mm.
・If the lower thread clamp and lower thread presser
are bent, replace them.
・Check that the screws are tightened.

105

Screw

–
Lower thread
clamp

3999Q

11-5. Uneven seams (3) ……Seam lifts up at the sewing start
Seam lifts up and does not tighten at the sewing start
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Upper
thread
trimmer Adjust the timing so that the upper thread trimmer
gradual opening timing
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
Upper
thread
trimmer Apply grease to the inclined face of the opening cam.
operation
Upper thread feeding
Thread take-up amount
Loosen the screw to decrease thread take-up amount
so that upper thread does not pull out of trimmer
assembly at the sewing start.

Decrease

Increase

Screw

Page
101
101

109

4000Q

HE-800B

152

11. TROUBLESHOOTING

11-6. Uneven seams (4) …… Uneven sewing pitch at the sewing start
Bird’s nests form at the sewing start, and after 5 - 6 mm the sewing pitch suddenly increases
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Lower thread clamp
Lower
thread
clamp Advance the timing at which the lower thread clamp
opening timing
starts to open.

Page
105

11-7. Uneven seams (5)……Poor rounding of seam
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Thread tension

Check
Zigzag thread upper thread
tension
Zigzag
tension
disc
opening

Remedy
Adjust the upper thread tension appropriately.

Lower thread tension

Adjust the lower thread tension appropriately.

INSTRUCTION
MANUALCD

Upper thread threading

Thread the upper thread correctly.

INSTRUCTION
MANUALCD

Lower thread threading

Thread the lower thread correctly.

INSTRUCTION
MANUALCD

Stitch patterns

Purl stitch, whip stitch

Set using parameter number 53.

INSTRUCTION
MANUALCD

Tension release

Tension release timing

Use parameter numbers 54 to 57 to set the timing for
changing the thread tension.

INSTRUCTION
MANUALCD

Threading

・Check the opening of the zigzag tension discs.
・Replace the tension release solenoid.

Page
INSTRUCTION
MANUALCD

108

11-8. Uneven seams (6) …… Around rear tack or front tack
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Tension release
Tension release timing
Use parameter numbers 54 to 57 to set the timing for
changing the thread tension.
Threading
Upper thread threading
Thread the upper thread correctly.
Lower thread threading
Zigzag thread tension

Upper thread trimmer

Zigzag
opening

tension

Upper
thread
operation

Thread the lower thread correctly.
disc

trimmer

・Adjust the tension disc opening amount.
・Check the opening of the zigzag tension discs.
・Replace the tension release solenoid.
Apply grease to the inclined face of the opening cam.

Page
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

108
101

11-9. Uneven seams (7) …… Loose thread end at end backtack
Cause
Backtack shape

153

Check
Checking the number of
end backtack stitches
Checking the end backtack
width

Remedy
Adjust the setting values for parameter numbers 51
and 52.

HE-800B

Page
INSTRUCTION
MANUALCD

11. TROUBLESHOOTING

11-10. Uneven seams (8) …… Thread sticking out at end backtack
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Backtack shape
Checking the number of Adjust the setting values for parameter numbers 51
end backtack stitches
and 52.
Checking the end backtack
width
Uneven
material Work clamp pressure
Increase work clamp pressure.
feeding
* The standard height of the adjustment screw is
approximately 30 mm, so tighten it further than this.
Work clamp
When using knit material, replace with the -3 work
clamp and needle plate.
Upper
thread
trimmer Adjust to an appropriate opening timing.
opening timing
Upper
thread
trimmer Apply grease to the inclined face of the opening cam.
operation
Lower
thread
clamp Adjust so that the lower thread clamp plate opens
opening timing
when the feed mechanism moves 6 - 7 mm.

Page
INSTRUCTION
MANUALCD

91
–
101
101
105

11-11. Uneven seams (9) …… Sticking in needle plate
Front and rear tack sections of material gets stuck in needle hole
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Start backtack
Number of start backtack Use parameter number 38 to reduce the number of
stitches
stitches in the front tack.
* If the material is soft, it can be effective to set the
number of stitches to 0.
Rear tack
Rear tack vector shape
Use parameter number 31 to set the rear tack vector
shape to a rectangle.
* Setting the vector shape to a rectangle can be
effective when the width is less than the bar tack
width.
Needle plate
Needle plate
・When using knit material, replace with the -3 needle
plate.
・Replace with a needle plate with a smaller needle
hole.

HE-800B

Page
INSTRUCTION
MANUALCD

INSTRUCTION
MANUALCD

–

154

11. TROUBLESHOOTING

11-12. Uneven seams (10) …… All stitches
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Threading
Upper thread threading
Thread the upper thread correctly.

Thread path

Page
INSTRUCTION
MANUALCD

Lower thread threading

Thread the lower thread correctly.

Flaw or abrasion on the
thread path

Polish with buff or replace the part.
Especially, pay attention to finishing around needle
plate hole.

INSTRUCTION
MANUALCD

–

Needle plate hole

Needle
Thread chips or dust
Upper thread
Rotary hook holder

Needle installation

Insert needle fully into needle bar.

Needle size
Rotary hook rim
Rotary hook edge
Around needle plate hole
Upper thread tension

Replace needle with thicker one.
Remove thread chips or dust.

Thread and needle
Flaw on the rotary hook
holder

Replace needle with one that fits for the thread.
Polish with buff or replace the part.

3996Q
INSTRUCTION
MANUALCD

–
–

Increase upper thread tension while checking stitches.

INSTRUCTION
MANUALCD

–

Check flaw here
Adjust the rotary hook
overlap amount.

3997Q

Rotary hook
Bobbin winder tension
bracket

Rotary hook holder and
inner rotary hook overlap
amount
Rotary hook lubrication
Bobbin thread tension
Uneven bobbin winding

Lower thread

Lower thread tension

Bobbin case

Damaged
outside
of
bobbin case and bent
bobbin holder spring, etc.
Purl stitch, whip stitch

Stitch patterns

155

Adjust the rotary hook holder and inner rotary hook
overlap amount.
Decrease the quantity of lubrication oil.
* Note that if you reduce the amount of oil too much,
thread breakages may occur.
Use the tension nut to adjust the lower thread winding
tension.
Move bobbin winder tension bracket up and down to
adjust.
Adjust the lower thread tension.
Polish with buff or replace the part.
* Use the HE-800B bobbin case.
Set using parameter number 53.

HE-800B

91
109
–
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

–
INSTRUCTION
MANUALCD

11. TROUBLESHOOTING

11-13. Upper thread run out
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer Installation
position
of Adjust the installation position of upper thread trimmer
assembly
upper
thread
trimmer assembly by moving the setting plate assembly.
assembly
・ Upper thread trimmer longitudinal position
adjustment
・Upper thread trimmer cutting depth adjustment

Page

98, 99

4005Q

Upper
thread
trimmer
assembly holding force

Adjust so that the thread does not come out when you
cut it with trimmer and hold the end of the thread
between your fingers and gently swing the assembly.
・Bend the trimmer U or replace them so that the
correct force is applied.
・Repair any damage from striking the needle.

Cotton yarn #60
Holding force approx. 2N

–

4006Q

Opening cam position

Adjust the position so that the trimmer does not touch
the opening cam when the work clamp is lowered.

101

Approx. 0.5 mm

4107M

(Continued on next page)

HE-800B

156

11. TROUBLESHOOTING

Cause
Tension release
timing

Check
End of tension release at
the beginning of sewing
Opening amount of zigzag
tension discs and bar tack
tension discs

Remedy
Use parameter number 54 to retard the timing for
changing the thread tension (increase the setting
value).
・ Adjust the zigzag tension discs by moving the
tension stud bracket in and out.
・ Adjust the bar tack tension discs opening amount to
0.5 - 1.0 mm by removing the top cover and moving
the tension release cam.

Page
INSTRUCTION
MANUALCD

108

Zigzag tension

Tack tension

0.5 - 1 mm
4008Q

Upper thread feeding

Thread take-up amount

Loosen the screw to decrease thread take-up amount
so that upper thread does not pull out of trimmer
assembly at the sewing start.

Decrease

Increase

Screw

109

4000Q

Rotary hook

Lower thread

Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
Thread chips on rotary
hook edge
Lower thread retaining
amount

1. Adjust the needle bar height to “1” on the gauge.
2. Adjust the needle and rotary hook timing to “2” on
the gauge.
Remove thread chips.

88
89
–

Adjust the lower thread retaining amount.

104

4003Q

Lower thread snapping

Sewing start speed

Lower
thread
opening timing
Slow start

Bar tack thread
tension

Bar tack thread tension is
too strong.

157

clamp

Adjust the positions of the lower thread retainer, lower
thread clamp and lower thread presser plate so that
they do not snap the lower thread.
Adjust so that the lower thread clamp plate opens
when the feed mechanism moves 6 - 7 mm.
Use parameter numbers 10 to 13 to set the number of
stitches and the speed for slow starting.
Make the bar tack tension as weak as possible.

HE-800B

INSTRUCTION
MANUALCD

105
INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

11. TROUBLESHOOTING

11-14. Unraveling of thread trimmed by upper thread trimmer assembly
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer Installation
position
of Adjust the installation position of upper thread trimmer
assembly
upper
thread
trimmer assembly by moving the setting plate assembly.
assembly
・ Upper thread trimmer longitudinal position
adjustment
・ Upper thread trimmer cutting depth adjustment

Page

98, 99

4005Q

Burr on tips of upper thread
trimmer M and upper
thread trimmer U.

Polish with buff or replace the part.
Check burr on upper
side here
Check burr here

–

4009Q

Tension release
timing

Opening amount of zigzag
tension discs and bar tack
tension discs (particularly
zigzag tension discs)

・ Adjust the zigzag tension discs by moving the
tension stud bracket in and out.
・ Adjust the bar tack tension discs opening amount to
0.5 - 1.0 mm by removing the top cover and moving
the tension release cam.

108

Zigzag tension

Tack tension

0.5 - 1 mm
4008Q

HE-800B

158

11. TROUBLESHOOTING

11-15. Upper thread miss-trimming
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Installation
position
of Adjust the installation position of upper thread trimmer
assembly
upper
thread
trimmer assembly by moving the setting plate assembly.
assembly
・ Upper thread trimmer longitudinal position
adjustment
・Upper thread trimmer cutting depth adjustment

Page

98, 99

4005Q

Upper
thread
trimmer
assembly holding force

Cotton yarn #60
Holding force approx. 2N

–

4006Q

Trimmer driving arm

159

Upper
thread
cutting depth

trimmer

Adjust the position of the trimmer driving arm roller.

HE-800B

11. TROUBLESHOOTING

11-16. Needle strikes upper thread trimmer
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer Installation
position
of Adjust the installation position of upper thread trimmer
assembly
upper
thread
trimmer assembly by moving the setting plate assembly.
assembly
・ Upper thread trimmer longitudinal position
adjustment
・Upper thread trimmer cutting depth adjustment

Page

98, 99

4005Q

Upper
thread
operating force

trimmer

Remove any scratches and burrs, and adjust the upper
thread trimmer M to open when the projection is
pressed with a force of 4N or less.
–

4010Q

Longitudinal feed arm

Installation position of the
longitudinal feed arm

Move the upper thread trimmer driving link so that it
stops at the face plate. In this position, tighten the bolts
so that the small slot in the upper thread trimmer lever
and the edge of the washer are aligned.
Aligned

Upper thread
trimmer lever
Washer

Cam

Upper
thread
trimmer
opening timing
Upper
thread
trimmer
gradual opening timing

Opening cam

Work clamp
position

home

Upper
thread
trimmer
operation
Work clamp home position
position

4011Q

Adjust so that the cam opens the stop plate properly.
Adjust the timing so that the upper thread trimmer
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
Apply grease to the inclined face of the opening cam.

102
101
101

After the home position has been detected, press the
THREAD key to lower the work clamp, and then adjust
the distance between the upper thread trimmer and the
center of the needle to 5.5 - 6.0 mm.
–

5.5 - 6.0 mm
4012Q

(Continued on next page)

HE-800B

160

11. TROUBLESHOOTING

Cause
Upper thread trimmer
lever

Check
Upper thread trimmer lever
operating force

Remedy
Adjust so that the upper thread trimmer lever opens
gently when the stop plate is separated from the
stopper.

Page

–

4013Q

11-17. Needle breakage
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Needle
Rotary hook

Needle plate

Check
Needle installation
Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
Gap between the needle
and the tip of the rotary
hook

Needle plate position

Remedy
As viewed from the direction of the face plate, attach
the needle so that the groove of the needle faces
frontward.
1. Adjust the needle bar height to “1” on the gauge.
2. Adjust the needle and rotary hook timing to “2” on
the gauge.
Adjust the gap between the needle and the rotary hook
tip to 0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Move the needle bar to the left and right with your
finger, and check that the tip of the rotary hook does
not strike the needle.
Adjust the forward/back position of the needle plate so
that the needle is in the center of the needle hole.

Page
91
–
89

–

Bisect

Burr on the screw hole
edge (in event of uneven
material feeding)

4014Q

Polish with buff.
Check the chamfered side
finishing

–
(Needle plate cross section)
4015Q

Upper thread trimmer
assembly
Cutter

Needle
strikes
upper
thread trimmer
Clearance between needle
bar and cutter

Refer to “11-16. Needle strikes upper thread trimmer”.

160, 161

Install the cutter so that the clearance between the
needle bar and the cutter is 0.3 mm.
* The cutter release section of the needle bar should
be at a right angle to the cutter.
0.3 mm

4016Q

161

HE-800B

11. TROUBLESHOOTING

11-18. Imperfect cutter function (imperfect material cutting)
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Cutter
Installation
position
of Install the cutter so that its edge is aligned with the top
cutter
of the needle plate.
Cutter blade
・ If blade is worn or chipped, sharpen it or replace it.
・ Replace with the special needle plate (optional).
Damage
to
cutter ・Replace any parts that are damaged.
mechanism parts
・Tighten any loose screws.
Loose screws
Cutter solenoid
Check for a disconnected Check that cutter sensor connector P7 on the main
cord.
P.C. board and cutter solenoid connector P2 on the
cutter P.C. board are properly connected.
Solenoid stopper
Nut
Check if the nut is loose, and tighten it securely.
Cutter sensor position
・Adjust the cutter sensor position.
・Check if the mounting screws are loose, and tighten
them securely.

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INSTRUCTION
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4.5 ± 0.5 mm
Cutter sensor

4017Q

Cutter bar guide

Smoothness
operation

cutter

Adjust the cutter bar guide so that the cutter operates
smoothly with no play.

11-19. Cutter does not return
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Cutter
Cutter blade
If blade is worn or chipped, sharpen it or replace it.
Sticks in material
Needle plate
Replace with the special needle plate (optional).
Cutter bar guide

Smoothness
operation

cutter

Adjust the cutter bar guide so that the cutter operates
smoothly with no play.

HE-800B

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11. TROUBLESHOOTING

11-20. Cutter and upper thread trimmer touch
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Check if the cam opens the Adjust the cam position.
stop plate.
* If the feed mechanism operates when the cam has
not opened the stop plate, the cutter will bump
against the upper thread trimmer.

Page

102

4018Q

11-21. Seam is cut
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Setting the length of Length of the hole
Set parameter number 02 to the same value as the
the hole
length of the cutter being used.
Setting the cutter Cutting of zigzag seam
・Use parameter number 04 to set the cutter X space.
spacing
・Use parameter number 03 to set the correction of the
cutter X position.
Cutter
Cutter play
Adjust the cutter bar guide so that the cutter operates
smoothly with no play.
Cutter knife bending
Use the cutter holder (option) to prevent the cutter
knife from becoming bent.

Page
INSTRUCTION
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INSTRUCTION
MANUALCD

4019Q

163

HE-800B

11. TROUBLESHOOTING

11-22. Upper thread miss-winding
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Installation height
Adjust the upper thread trimmer installation height.
Upper
thread
trimmer Adjust the timing so that the upper thread trimmer
gradual opening timing
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
Upper
thread
trimmer Adjust so that the cam opens the stop plate properly.
opening timing
Upper
thread
trimmer ・Polish blade of upper thread trimmer M and upper
assembly movement
thread guide with buffer.
・Check for burrs on the top surface of upper thread
trimmer M.
・Replace the parts.
Lateral position of upper
thread trimmer

Page
100
101
102

–

Adjust the lateral position of the upper thread trimmer.
Approx. 1 mm

4020Q

Stitch quality

Upper thread tension
Zigzag width in the zigzag
stitch portion

Work clamp

Underlay

Bar tack

Uneven material feeding

Underlay is being sewn.

Straight bar tacking
being carried out

Decrease tension to such a degree that it does not
influence stitch quality.
Use parameter number 08 to increase the zigzag width
to such a degree that it does not influence the seam
shape.
・Increase work clamp pressure. (Press material so
that the material is properly stretched.)
・When using knits or woven materials, replace the
parts with the -3 specification parts:
Length feed plate (for specification -3), work clamp
assembly (for knits), needle plate 1.2 (for
specification -3)
・Use parameter number 47 to reduce the underlay
feed pitch to about 0.5.
・Use parameter number 14 to reduce the underlay
sewing speed.
* If sewing knitted wear, problems may easily occur
with the insertion of the upper thread, so you may
need to process the end of the thread.
When carrying out straight bar tacking, problems may
easily occur with the insertion of the upper thread, so
you will need to process the end of the thread.

INSTRUCTION
MANUALCD
INSTRUCTION
MANUALCD

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INSTRUCTION
MANUALCD

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11-23. Work clamp is not raised (1) ……Error does not occur.
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Work clamp lifting Check the work clamp Change the settings of memory switch Nos. 001, 002,
height
lifting height setting
003, 004.
Work clamp motor
Cord connection
Check if there are any problems with the connection
and contacts of work clamp motor connector P23 on
the main P.C. board.
Work clamp motor drive Check if the drive gear screw is loose.
gear

HE-800B

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164

11. TROUBLESHOOTING

11-24. Work clamp is not raised (2) ……Error occurs.
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Upper thread trimmer
Interference
between Adjust the installation height of the upper thread
upper thread trimmer and trimmer (remove the upper thread trimmer and check).
work clamp
* Be particularly careful when sewing joints.
Upper
thread
trimmer Apply grease to the inclined face of the opening cam.
operation
Lower thread trimmer
Interference between fixed Repair or replace the parts.
knife set, lower thread
Lower thread
clamp,
lower
thread
trimmer link A assembly
presser and lower thread
retainer.
Lower thread
trimmer
connecting rod

Remove the shoulder
screw to check.

Loose screws

Work clamp lifting
height setting

Threading

Rubbish, dust or thread
scraps present
Check for loose screws in
the upper thread trimmer,
lower thread trimmer and
work
clamp
lifter
mechanisms.
Check the work clamp
lifting height setting.

Lower thread threading

Lower thread tension

Presser lifter home
position

165

Upper
thread
trimmer
operation
Presser lifter home position

100
101

–

4022Q

Remove all rubbish, dust and thread scraps from the
lower thread trimmer.
Securely tighten all screws.

–

–
Change the settings of memory switch Nos. 001, 002,
003, 004.
* If the work clamp lifting height is too high, the lower
thread trimming operation and the work clamp lifting
will become stiff, and the work clamp motor may go
out of step.
Insert the bobbin correctly and pass the lower thread
through the bobbin case correctly.
* If the bobbin is inserted back-to-front, it will spin
loosely and the work clamp motor may go out of
step.
・ Reduce the lower thread tension.
* If the lower thread tension is much too strong, the
work clamp motor may go out of step.
・ Use memory switch No. 060 to reduce the work
clamp lifting speed setting to make the lifting speed
slower.
・ Buff this section A to reduce the
thread retaining resistance.

4023Q

Upper thread trimmer

Page

INSTRUCTION
MANUALCD

*
*

Carry out opening timing adjustment for the upper
thread trimmer.
Adjust the presser lifter home position.

HE-800B

INSTRUCTION
MANUALCD

101
87

11. TROUBLESHOOTING

11-25. Lower thread is not trimmed (pulls when material is removed)
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Fixed knife set
Fixed knife and movable Adjust the fixed knife set installation position.
knife do not mesh.

Page

Fixed knife

Movable knife

104

4024Q

Knife tip is bent or chipped.

Repair or replace the knife.

–

11-26. Feed mechanism does not move and error occurs.
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Feed motor
Cord connection
Check if there are any problems with the connection
and contacts of feed motor connector P22 on the main
P.C. board.
Upper thread trimmer
Upper
thread
trimmer Remove and re-install the upper thread trimmer.
position

Page
INSTRUCTION
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101
Install so that the projection on
trimmer M is not inserted.
* Always make sure that the upper
thread trimmer is in the correct
position before use.

Check if the cam opens the
stop plate.

4895M

Adjust the cam position.
* If the feed mechanism operates when the cam has
not opened the stop plate, the cutter will bump
against the upper thread trimmer.
102

4018Q

Feed home position
Feed timing belt

Feed home position
Feed timing belt tension

Adjust the feed home position.
Adjust the feed timing belt.

HE-800B

86
54

166

11. TROUBLESHOOTING

11-27. Needle does not zigzag or noise occurs when needle zigzags
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Stopper
Stopper position
Adjust the stopper position.

Page
75

11-28. Sewing machine stops during sewing
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Thread breakage
Thread breakage detector Adjust the thread breakage detector position.
detector
position
* If the detector is not adjusted, sewing may stop even
when the thread is not broken.
Threading
Upper thread threading
Pass the thread correctly through the thread guide.
Error [E301]

Upper
thread
operation
Uneven stitches

trimmer

Move the work clamp up and down and check that it
moves smoothly.
Adjust to obtain the optimum stitches.

Page
107
INSTRUCTION
MANUALCD

21
INSTRUCTION
MANUALCD

11-29. Upper shaft does not rotate as far as the needle up stop position
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Thread retainer and
Thread
trimmer 1. Turn the machine pulley backward to set the
needle bar to the needle up position.
rotary hook are
mechanism position
2. Push the thread driving arm in the direction of the
touching.
arrow to set the thread trimming mechanism to the
home position.

Page

Thread driving arm

–

4109M

11-30. Operation panel display freezes and operation is not possible
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Poor
connection P.C. board cord connections ・ Check if there are any problems with the
inside control box.
connection and contacts of connector P5 on the
main P.C. board.
・ Check if there are any problems with the
connection and contacts of connector P2 and
operation panel connector P3 on the motor P.C.
board.

167

HE-800B

Page

INSTRUCTION
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MEMO

HE-800B

168

SERVICE MANUAL

HE-800B
I3061003D
2014.03. D (1)

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ACE&EASTMAN He 800B Service Manual User

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