ACE&EASTMAN Bas 342G Service Manual 342G_SV_cover1_07.08.28__E User

User Manual: ACE&EASTMAN Bas-342G Service Manual

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BAS-342G

SERVICE MANUAL

Please read this manual before making any adjustments.

DIRECT DRIVE

PROGRAMMABLE ELECTRONIC PATTERN SEWER

This service manual is intended for BAS-342G; be sure to read the BAS-342G instruction manual
before this manual.
Carefully read the “SAFETY INSTRUCTIONS” 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.

BAS-342G

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.

CAUTION

The instructions which follow this term indicate situations where failure to follow the
instructions could cause injury when using the machine or physical damage to equipment
and surroundings.

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.

BAS-342G

i

[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 cover of the control box. Touching areas where high voltages are present can result in severe
injury.

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.

The pneumatic delivery capability should be greater
than the requirements for the sewing machine's total
air consumption.
Insufficient pneumatic delivery capability 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 160 kg.
Use equipment such as a crane or hoist when
installing the machine head and adjusting the height
of the table.
If you try to lift the machine head yourself, it may
cause injuries such as back injury.

Install the safety covers to the machine head and
motor.

Do not connect the power cord until installation is
complete. If the foot switch is depressed by mistake,
the sewing machine might start operating and injury
could result.

Use a table with a height of 84 cm or less. If the table
is too high, the machine head may become
unbalanced and fall down, and serious injury or
damage to the sewing machine may result.

Hold the machine head with both hands when tilting it
back or returning it to its original position.
In addition, do not subject the machine head to extra
force while it is tilted back. If this is not observed, the
machine head may become unbalanced and fall
down, and serious injury or damage to the sewing
machine may result.

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. If the oil
and grease get into your eyes or onto your skin,
inflammation can result.
Furthermore, do not drink or eat the lubricating oil or
grease. They may cause diarrhea or vomiting.
Keep the oil out of the reach of children.

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.

ii

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.

BAS-342G

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

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. If the
foot switch is depressed by mistake, the sewing
machine might start operating and injury could result.
• When threading the needle
• When replacing the bobbin and needle
• 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.

Cleaning
Turn off the power switch before carrying out
cleaning. If the foot switch is depressed by mistake,
the sewing machine might start operating and injury
could result.

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. If the oil
and grease get into your eyes or onto your skin,
inflammation can result.
Furthermore, do not drink or eat the lubricating oil or
grease. They may cause diarrhea or vomiting.
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 before carrying out the following operations. If
the foot switch is depressed by mistake, the sewing
machine might start operating and injury could result.
• Inspection, adjustment and maintenance
• Replacing consumable parts such as the rotary
hook
Disconnect the air hoses from the air supply and wait
for the needle on the pressure gauge to drop to “0”
before carrying out inspection, adjustment and repair
of any parts which use the pneumatic equipment.

Hold the machine head with both hands when tilting it
back or returning it to its original position.
In addition, do not subject the machine head to extra
force while it is tilted back. If this is not observed, the
machine head may become unbalanced and fall
down, and serious injury or damage to the sewing
machine may result.
If the power switch and air need 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.

BAS-342G

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.

1

3

4

5

2

Be careful to avoid getting hands caught in sliding
parts.

Safety devices:
Devices such as eye guard, finger
guard, thread take-up cover, motor
cover, X motor cover, tension
release solenoid cover, inside
cover, outside cover, middle cover,
fixed cover and rear cover

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.

Direction of operation

Rear cover
Rear cover
Thread take-up cover
Inside cover R

Middle cover

Outside cover

Eye guard

Finger guard

Fixed cover

3956M

iv

BAS-342G

Tension release
solenoid cover
Inside cover L
Motor cover

Middle cover
Outside cover

Rear cover

Fixed cover

X motor cover

3957M

BAS-342G

v

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

4. MECHANICAL DESCRIPTIONS ......... 35

2. FUNCTION SETTINGS.......................... 2

4-1. Needle bar and thread take-up mechanisms ....35

2-1. List of special functions when power is

4-2. Lower shaft and shuttle race mechanisms ........35

turned on ................................................................2

4-3. Work clamp lifter mechanism..............................36

2-2. List of advanced functions.....................................3

4-4. Intermittent presser foot lifter mechanism ..........36

2-3. Memory switch setting method (Advanced).........4

4-5. Intermittent presser foot stroke mechanism.......37

2-4. List of memory switch settings..............................5

4-6. Feed mechanism.................................................38

2-5. Stitch counter checking method..........................15

4-7. Thread trimmer mechanism................................39

2-6. Error history checking method ............................16

4-8. Tension release mechanism...............................40

2-7. Input checking method ........................................17

4-9. Thread wiper mechanism....................................40

2-8. Output checking method .....................................20

5. DISASSEMBLY .................................... 41

2-9. Software version checking method ....................22

5-1. Covers ..................................................................41

3. READING / WRITING DATA................ 23

5-2. Thread wiper mechanism....................................42

3-1. Handling data.......................................................23

5-3. Work clamp arm mechanism..............................43

3-2. Notes on handling CF cards (sold separately) ..24

5-4. Intermittent presser foot lifter mechanism (1) ....44

3-3. Structure of a CF card folder...............................24

5-5. Needle bar mechanism .......................................45

3-4. Data read/write mode ..........................................25

5-6. Upper shaft mechanism ......................................46

3-5. Reading sewing data from CF cards..................26

5-7. Lower shaft mechanism ......................................47

3-6. Writing sewing data to CF cards.........................27

5-8. Feed covers .........................................................48

3-7. Reading memory switch data from CF cards ....28

5-9. Feed mechanism.................................................49

3-8. Writing memory switch data to CF cards ...........28

5-10. Work clamp lifter mechanism............................51

3-9. Reading user program data from CF cards.......29

5-11. Tension release mechanism.............................52

3-10. Writing user program data to CF cards............29

5-12. Intermittent presser foot lifter mechanism (2) ..52

3-11. Updating the control program ...........................30

5-13. Thread trimmer mechanism..............................53

3-12. Writing error log data to CF card ......................31

5-14. Shuttle hook mechanism...................................54

3-13. Reading sewing data from floppy disks ...........31

6. ASSEMBLY........................................... 55

3-14. Writing sewing data to floppy disks ..................32

6-1. Thread trimmer mechanism (1) ..........................55

3-15. Reading extended option output data

6-2. Intermittent presser foot lifter mechanism (1) ....57

from a CF card ...................................................33
3-16. Writing extended option output data
to CF cards.........................................................34

6-3. Tension release mechanism...............................57
6-4. Work clamp lifter mechanism..............................58
6-5. Feed mechanism.................................................60

3-17. Reading extended option output data

6-5-1. Y-feed mechanism..................................60

from floppy disks ................................................34

6-5-2. X-feed mechanism..................................65
6-6. Feed covers .........................................................70
6-7. Upper shaft mechanism ......................................72
6-8. Needle bar mechanism .......................................74
6-9. Intermittent presser foot lifter mechanism (2) ....76
6-10. Lower shaft mechanism....................................78
6-11. Shuttle hook mechanism...................................80

BAS-342G

6-12. Thread trimmer mechanism (2)........................80

8. ELECTRICAL MECHANISM................ 109

6-13. Work clamp arm mechanism............................81

8-1. Precautions while carrying out

6-13-1. Adjusting the lift of the work clamp arm
assembly............................................... 82

adjustments......................................................109
8-2. Inside the control box and operation

6-14. Thread wiper mechanism .................................83

panel structure .................................................110

6-15. Covers ................................................................84

8-3. Description of fuses .............................................111

7. ADJUSTMENT....................................... 85

8-4. Description of connectors....................................112

7-1. Checking the safety switch..................................85

8-4-1. Connector positions ................................112

7-2. Standard thread tension......................................86

8-4-2. Symptoms when there are poor

7-2-1. Upper and lower thread tension............ 86

connections .............................................115

7-2-2. Thread take-up spring............................ 87

8-5. Troubleshooting ...................................................119

7-2-3. Arm thread guide R ................................ 87

8-5-1. Troubleshooting procedure.....................119

7-3. Adjusting the needle bar height ..........................88

8-5-2. Diagnosis flowchart.................................120

7-4. Adjusting the needle bar lift amount ...................88

8-5-3. Remedy ...................................................124

7-5. Adjusting the driver ..............................................88

9. TABLE OF ERROR CODES................ 135

7-6. Adjusting the needle clearance...........................89

10. TROUBLESHOOTING ....................... 139

7-7. Adjusting the shuttle race thread guide..............89
7-8. Adjusting the rotary hook lubrication amount.....90

11. 7-SEGMENT DISPLAY ...................... 142

7-9. Adjusting the position of the movable knife........91
7-10. Replacing the movable and fixed knives .........93
7-10-1. Installing the feed plate ........................ 94
7-11. Adjusting the thread wiper.................................94
7-12. Presser foot installation position .......................95
7-13. Changing the intermittent stroke.......................95
7-14. Adjusting the work clamp lift amount................97
7-15. Adjusting the air pressure .................................97
7-16. Adjusting the thread trimmer cam position ......98
7-17. Belt tension adjustment.....................................98
7-18. Adjusting the tension release amount............100
7-19. Adjusting the lower shaft gear backlash......... 101
7-20. Adjusting the home position............................ 103
7-20-1. Presser foot lift home position ............ 103
7-20-2. X-Y feed home position ...................... 104
7-21. Adjusting the needle up stop home position..106
7-22. Adjusting the needle up stop position.............107

BAS-342G

1. SPECIFICATIONS

１. SPECIFICATIONS
Sewing machine

Lock stitch, pattern tacking sewing machine (with large shuttle hook)

Stitch formation

Single needle lock stitch

Max. sewing speed

2,700 rpm

Sewing area (X x Y)

Max. 300 x 200 mm

Feed mechanism

Intermittent feed, pulse motor drive
0.05 − 12.7 mm

Stitch length
No. of stitches

500,000-stitch internal memory (*)

Maximum no. of stitches

20,000 stitches (per program)

No. of sewing data items
that can be stored

Internal memory: 512 (*), CF card: 900

Work clamp lift method

Pneumatic method

Work clamp height

Max. 30 mm

2-step work clamp

Integrated-type work clamp

Intermittent presser foot lift
amount
Intermittent stroke

22 mm
2 − 4.5 mm, 4.5 − 10 mm or 0 (Default setting 3 mm)

Rotary hook

Double-capacity shuttle hook (standard shuttle hook sold separately)

Wiper device

Standard equipment

Thread trimmer

Standard equipment

Data storage method

Internal memory (Flash memory), CF card (32 MB − 2GB)
[Option] 3.5 floppy disk 2HD/1.44MB, 2DD

User programs

50

Cycle programs

9

Motor

550 W

AC servo motor

Weights

Machine head approx. 160 kg, operation panel approx. 0.6 kg
Control box 14.2 − 16.2 kg (Differs depending on destination)

Power supply

Single-phase 220 V, Three-phase 220 V/380 V/400 V

Air pressure

500 VA

0.5 MPa 1.8 l/min.

* The number of data items and stitches that can be stored will vary depending on the number of stitches in each program.

1

BAS-342G

2. FUNCTION SETTINGS

2. FUNCTION SETTINGS
2-1. List of special functions when power is turned on
4421Q

1365B

1

6

Memory switch setting mode (Standard)

Output checking function

4546Q

4541Q

Refer to the Instruction Manual.

2

Refer to “2-8. Output checking method”.

7

Memory switch setting mode (Advanced)

Software version display function

4542Q

4547Q

Refer to “2-3. Memory switch setting method (Advanced)”.

3

Refer to “2-9. Software version checking method”.

8

Data initialization function

Home position adjustment mode

4543Q

4548Q

Refer to the Instruction Manual.

4

Refer to “7-20. Adjusting the home position”.

9

Error log display function

4549Q

4544Q

Refer to “2-6. Error history checking method”.

5

Needle up stop position adjustment mode

Refer to “7-22. Adjusting the needle up stop position”.

Input checking function

4545Q

Refer to “2-7. Input checking method”.

BAS-342G

2

2. FUNCTION SETTINGS

2-2. List of advanced functions
While holding down the TEST key, press the corresponding combination key.

4550Q

1

5

Memory switch setting mode (Standard)

User program setting mode

4493Q

4489Q

Refer to the Instruction Manual.

Refer to the Instruction Manual.

2

6

Lower thread counter setting mode

Parallel movement mode

4551Q

4490Q

Refer to the Instruction Manual.

Refer to the Instruction Manual.

3

7

Production counter setting mode

Stitch counter checking mode

4552Q

4491Q

Refer to “2-5. Stitch counter checking method”.

Refer to the Instruction Manual.

4

8

Production counter temporary display function
When SPEED indicator is illuminated

4492Q

Refer to the Instruction Manual.

3

BAS-342G

CF data read/write mode

4553Q

Refer to “3-4. Data read/write mode”.

2. FUNCTION SETTINGS

2-3. Memory switch setting method (Advanced)
1

While pressing the TEST key and the SELECT key, turn
on the power switch.
* Keep pressing the TEST key and the SELECT key until
the model name is displayed and the buzzer beeps
once.

All indicators switch off

• The memory switch number will be displayed in the
PROGRAM No. display and the setting value for that
number will be displayed in the menu display.
Menu indicator switches off
TEST indicator illuminates

2

4449Q 4421Q

Press the
number.

Press the

or

or

key to select the memory switch

key to change the setting value.

4554Q

If you would like to display only the numbers of
memory switches that have been changed from
default settings

While pressing the SELECT key, press the
or
key.
• The numbers of memory switches that have been
changed from default settings will appear in order.
• If no memory switches have been changed from their
default settings, the display will not change and the
buzzer will beep twice.

4555Q

3

Press the TEST key.
• The changes will be memorized and the sewing
machine will switch to home position detection
standby.

Ending setting mode

TEST indicator switches off

•
•

If you would like to return the setting for a single memory switch to the default setting, press the
RESET key while the number for that memory switch is displayed.
To return the settings for all memory switches to the default settings, keep pressing the RESET key
for two or more seconds until the buzzer makes a long beep.

BAS-342G

4

2. FUNCTION SETTINGS

2-4. List of memory switch settings
Note: Regarding the term “work clamp” in the table
Normally the intermittent presser foot is lifted and dropped at the same time the work clamp is lifted and dropped.
However, the intermittent presser foot can be set not to operate by means of settings such as the setting for memory
switch No. 54.
No.
001

002

100

200

300

400

401

402

403
*1
*2

5

Setting
Setting item
value
Work clamp lift timing after sewing is completed
OFF
Lifts at the final stitch position.
ON
Lifts after moving to the sewing start position.
Integrated-type work clamp drop operation
0
Work clamp dropping in 1 step
1
Work clamp dropping in two steps (*1)
2
Do not use this setting.
Sewing start speed
The sewing speed for the first 1 to 5 stitches is set by memory switch numbers 151
OFF
to 155.
1st stitch at 400 rpm, 2nd stitch at 400 rpm, 3rd stitch at 600 rpm, 4th stitch at 900
ON
rpm, 5th stitch at 2,000 rpm
Single-stitch test feed
Test feed starts when the start switch is depressed, and it continues automatically
OFF
until the final stitch.
Test feeding
・ Is carried out one stitch at a time each time the work clamp switch is
depressed
ON
・ Is carried out continuously while the start switch is depressed
・ Is carried out one stitch at a time when the pulley is turned by hand
Production counter display
OFF
Lower thread counter display
ON
Production counter display
User programs
OFF
Disabled
ON
User program mode is enabled.
Cycle programs
OFF
Disabled
ON
When sewing user programs, the set programs are sewn in numeric order.
Maximum reduction ratio (mm display) (*2)
OFF
Displayed as %.
ON
Displayed as mm.
Split mode selection
0
Continuous split (split menu is disabled before split detection)
1
Continuous split (split menu is always enabled)
2
Independent split

The position of the work clamp stopper must be set. (Refer to the Instruction Manual.)
The mm display may differ slightly from the actual sewing size.

BAS-342G

Default
value
ON

0

OFF

OFF

OFF

OFF

OFF

OFF

0

2. FUNCTION SETTINGS
Work clamp settings
Setting
No.
Setting item
value
Work clamp operating mode (*3)
1
[Standard single pedal] Do not use this setting. (*4)
2
[Single pedal with no automatic work clamp lifter] Do not use this setting. (*4)
[Standard double pedal]
Work clamp lifts automatically, and drops when the work clamp switch is depressed.
3
* Dropping in one step or two steps can be set by means of memory switch No.
002.
[Double pedal with no automatic work clamp lifter]
4
Work clamp lifts while work clamp switch is being depressed.
[Work clamp 
 intermittent presser foot 2-step clamping]
When the work clamp switch is depressed to the 1st step, the work clamp is
5
lowered, and when it is depressed to the 2nd step, the intermittent presser foot is
lowered. (Lifting is carried out simultaneously.)
6
Do not use this setting.
[Forward/reverse pedal]
When the start switch is depressed, the work clamp is lowered and the sewing
machine starts in that order with forward control, and when the work clamp switch
7
is depressed, the sewing machine reverses and the work clamp is lifted.
* Dropping in one step or two steps can be set by means of memory switch No.
002.
[2-step work clamp using two presses]
When the work clamp switch is depressed, the work clamp drops to the
intermediate position (when two-step operation is set), then drops fully, and then
050
8
lifts in that order.
* Dropping in one step or two steps can be set by means of memory switch No.
002.
[Standard triple pedal]
The left pedal lowers the work clamp to the intermediate position and the right
pedal (center) lowers it all the way.
The start pedal (right) starts the sewing machine.
9
(If the right pedal (center) is depressed first, the work clamp will drop to the
intermediate position and it will then drop fully when the left pedal is depressed.
However, the speed of work clamp operation cannot be controlled, so do not use
this operation.)
[Triple pedal with independent home detection]
The right pedal (center) is used exclusively for detecting the home position.
10
The left pedal raises and lowers the work clamp, and the start pedal (right) starts
the sewing machine.
[Special triple pedal with independent home detection]
The right pedal (center) is used exclusively for detecting the home position.
11
The left pedal moves the work clamp back and forth to the intermediate position,
and when the start pedal (right) is depressed, the work clamp is lowered and the
sewing machine starts.
[Single pedal operation using work clamp switch]
12
When the work clamp switch is depressed to the 1st step, the work clamp is
lowered, and when it is depressed to the 2nd step, the sewing machine starts.

Default
value

3

*3

The operating modes given here are for the integrated-type work clamp. The same settings can also be made for
separate-type work clamps, but some parts and air tubes will need to be changed.

*4

No devices are compatible with the BAS-342G.

BAS-342G

6

2. FUNCTION SETTINGS

No.
051

052

053

054

055

056

057

058

059

*5

7

Setting
Setting item
value
Work clamp operation before home position detection
OFF
Work clamp cannot be raised or lowered before home position detection (*5)
ON
Work clamp can be raised and lowered before home position is detected
Work clamp operation during split programs
OFF
Work clamp is raised automatically when sewing pauses due to a split program
Work clamp is raised if the work clamp switch is depressed when sewing pauses
ON
due to a split program
Time from intermittent presser foot lifting until feed mechanism starts moving
0 - 999
[Units ms]
Intermittent presser foot lowering timing
Intermittent presser foot is lowered when the work clamp switch is depressed, but
0
it is not lowered at the feed retract position.
1
Intermittent presser foot is lowered when the work clamp switch is depressed.
Intermittent presser foot is lowered at the sewing start, regardless of the work
2
clamp switch operation.
Work clamp signal valve special output for pneumatic-type work clamp
0
Disabled
Valve output is reversed for pneumatic specifications
1
(Switch the air tube connections so that the work clamp can lift when the power is
turned off.)
Reverse valve output is output simultaneously for 2-position valve specifications.
(Right work clamp reverse = Option output No. 4, Left work clamp reverse =
2
Option output No. 5: When using a separate-type work clamp)
Thread winding operation before home position is detected
OFF
Thread winding cannot be carried out before home position is detected.
ON
Thread winding can be carried out before home position is detected. (*5)
Work clamp operation when feed moves to sewing start position after home position is detected
Work clamp stays lowered after home position is detected
OFF
Work clamp rises when the work clamp switch is depressed.
Work clamp lifts automatically after home position is detected.
ON
* Disabled when memory switch No. 050 = 2 or 4.
Work clamp operation at sewing end
Work clamp lifts automatically at the sewing end.
OFF
* Disabled when memory switch No. 050 = 2 or 4.
ON
Work clamp does not lift automatically at the sewing end
Weight of work clamp
-1
Light (no work clamp)
0
Standard
1
Heavy

Default
value
ON

OFF

100

0

0

OFF

ON

OFF

0

If the thread winding operation is to be carried out before home position detection, first carry out operations such as
lowering the intermittent presser foot to check that the needle does not interfere with any other parts when it is being
raised and lowered. In addition, if raising and lowering of the work clamp is disabled before home position detection is
carried out, thread winding cannot be carried out before home position detection, regardless of the setting for memory
switch No. 056.

BAS-342G

2. FUNCTION SETTINGS
Sewing machine motor settings
Setting
Default
No.
Setting item
value
value
Highest needle position stop
OFF
Disabled
When the upper shaft stops, the motor operates in reverse to return the needle bar
close to its highest position.
150
OFF
(When the motor operates in reverse to raise the needle, the thread take-up will
ON
stop at a position which is lower than its normal stopping position. As a result, the
thread take-up will rise slightly at the sewing start, and this may result in the thread
pulling out under certain conditions.)
1st stitch sewing speed at the sewing start
151
4
2 - 27
(Units x100 rpm)
2nd stitch sewing speed at the sewing start
152
8
(Units x100 rpm)
2 - 27
3rd stitch sewing speed at the sewing start
153
12
(Units x100 rpm)
2 - 27
4th stitch sewing speed at the sewing start
154
27
(Units x100 rpm)
2 - 27
5th stitch sewing speed at the sewing start
155
27
(Units x100 rpm)
2 - 27
5th last stitch sewing speed at the sewing end
156
27
(Units x100 rpm)
4 - 27
4th last stitch sewing speed at the sewing end
157
27
(Units x100 rpm)
4 - 27
3rd last stitch sewing speed at the sewing end
158
27
(Units x100 rpm)
4 - 27
2nd last stitch sewing speed at the sewing end
159
12
(Units x100 rpm)
4 - 20
Piercing force boosting operation
OFF
Disabled
161
OFF
Piercing force boosting operations are carried out when the sewing machine motor
ON
is locked
Regulation of sewing speed changes due to sewing pitch changes
OFF
Sewing speed varies depending on sewing pitch of the sewing data
Speed is fixed at the minimum sewing speed for the maximum pitch of the sewing
OFF
162
data
ON
(Set to ON if there may be a problem with sewing speed changes as a result of
pitch changes.)
Limits the maximum sewing speed.
163
27
12 - 27
(Units x100 rpm)
Thread trimming disabled
164
OFF
OFF
Thread trimming is carried out in accordance with the sewing data.
ON
All thread trimming operations are disabled.
Highest needle position stop angle (Units 2 degree steps) (*6)
165
0
0: Normal needle up position: Needle bar height increases for values in the
-15 - 0
negative direction.
*6
If the setting value becomes too large in the negative direction, error “E110” may be generated at the first sewing start
after the power is turned on.

BAS-342G

8

2. FUNCTION SETTINGS
Feed settings
Setting
No.
Setting item
value
Mechanism home position return when sewing is finished
OFF
The feed plate returns to the sewing start position at the sewing end.
250
When sewing is finished, the feed plate moves via the machine home position to
ON
the sewing start position.
Feed speed
1
100 mm/s Slow
2
200 mm/s
251
3
300 mm/s
4
400 mm/s
5
500 mm/s Fast
High-speed test feeding
OFF
Normally slow, but becomes faster when the work clamp switch is depressed.
252
Test feeding is at the same speed as sewing.
ON
* This does not apply to checking stitch by stitch.
Home position detection method
OFF
Depress the start switch while the program number is flashing.
253
Press the special external input switch [EXIN3] while the program number is
ON
flashing. (Start switch is disabled.)
Movement route to home position and sewing start position (*7)
0
No route specified
Moves in the order X
Y when moving to the home position, and in the order Y
 X
1
254
when moving to the sewing start position
Moves in the order Y
X when moving to the home position, and in the order X
 Y
2
when moving to the sewing start position
3
Moves while avoiding the middle of the work clamp
Changes the overall feed timing
260
-10 - 10
-10: Early  0: Standard 
 10: Late
Changes the feed timing for the 1st stitch at the sewing start
261
-10: Early  0: Standard 
 10: Late
-10 - 10
Changes the feed timing for the 2nd stitch at the sewing start
262
-10: Early  0: Standard 
 10: Late
-10 - 10
Changes the feed timing for the 3rd stitch at the sewing start
263
-10: Early  0: Standard 
 10: Late
-10 - 10
Changes the feed timing for the 3rd stitch before the sewing end
264
-10: Early  0: Standard 
 10: Late
-10 - 10
Changes the feed timing for the 2nd stitch before the sewing end
265
-10: Early  0: Standard 
 10: Late
-10 - 10
Changes the feed timing for the 1st stitch before the sewing end
266
-10: Early  0: Standard 
 10: Late
-10 - 10
If the overall feed timing (setting for No. 260) is changed from the default value, this specifies the
number of applicable stitches.
267
0
No limit
The feed timing returns to the standard feed timing once the specified number of
1 - 99
stitches has been sewn.
Changes feed timing reference
0
[Feed start reference] Makes the timing uniform at the start of feed.
[Need up reference] Changes the timing at the start of feed so that the needle
268
1
zigzagging is even.
2
[Feed end reference] Makes the timing uniform at the end of feed.
3
This cannot be set for the BAS-342G.
Home position detection operation when the program is changed
0
Disabled
270
Home position detection operation is disabled, but feed moves through the middle
1
of the sewing area.
2
Enabled
*7

9

Also change the settings for memory switch No. 250 and No. 270 as necessary.

BAS-342G

Default
value
OFF

3

OFF

OFF

0

0
0
0
0
0
0
0

0

1

0

2. FUNCTION SETTINGS
Operation panel settings
Setting
No.
Setting item
value
Operation panel changing limitation
0
No limits on changing setting values using the operation panel.
Program numbers, XY scale settings, sewing speed, lower thread counter,
1
intermittent presser foot height and digital tension values cannot be changed.
Program numbers, XY scale settings, sewing speed, intermittent presser foot
2
height and digital tension values cannot be changed.
350
3
Program numbers cannot be changed.
4
Program numbers and XY scale settings cannot be changed.
Program numbers, XY scale settings and sewing speed settings cannot be
5
changed.
6
XY scale settings cannot be enlarged. (They can be reduced.)
7
Sewing speed setting cannot be changed.
Changing memory switches
351
OFF
Allowed
ON
Forbidden
Counting method for lower thread counter and production counter
0
Counted for each item of sewing data
352
1
Counted for each thread trimming operation.
2
Counted when sewing data ends or when split stops
Counter timing for lower thread counter
353
OFF
Counted at the end of sewing.
ON
Counted at the start of sewing.
Switching program numbers using an external switch
0
Disabled
354
Program number is switched by means of the 5 bits of option input (EXIN6 EXIN10).
1-9
The applicable numbers are: Setting number: 3rd digit; last 2 digits: 1 to 31
Switching split numbers using an external switch
OFF
Disabled
355
Split number is switched by means of the 5 bits of option input (EXIN6 - EXIN10).
ON
The applicable numbers are: 1 to 31 (*8)
*8

Default
value

0

OFF

0

OFF

0

OFF

Only enabled for independent split mode. In addition, it is disabled when the setting for memory switch No. 354 is 1 to 9.

User program settings
Setting
No.
Setting item
value
Moving to the sewing start position when user program is changed
450
OFF
Moves to the next sewing start position after starting.
ON
Moves to the next sewing start position at the same time as switching.
Limitations on changing settings for user programs
452
OFF
No limit
ON
User program contents cannot be changed.

BAS-342G

Default
value
OFF

OFF

10

2. FUNCTION SETTINGS
Data editing settings
Setting
No.
Setting item
value
Sewing area limit in X direction
460
[Units mm]
0 − 300
Sewing area limit in Y direction
461
[Units mm]
0 − 200
Enlargement/reduction reference point
0
Center of sewing frame
462
1
Sewing start position
2
Center of pattern
Enlargement/reduction for bar tacking
463
OFF
Bar tacking stitches (pitch approx. 1 mm or less) cannot be enlarged or reduced.
ON
Bar tacking stitches (pitch approx. 1 mm or less) are also enlarged or reduced.
Enlargement/reduction ratio in XY directions
OFF
Disabled
464
Enlargement/reduction ratio settings are the same in X and Y directions (disabled
ON
for user programs)
Storing parallel movement amount for sewing pattern
Initialized when program number or enlargement/reduction ratio is changed and
OFF
465
when power is turned off.
Initialized when program number or enlargement/reduction ratio is changed but
ON
not when power is turned off.
Reading sewing data from external media into internal memory
0
[Normal mode] Programs are copied one by one into internal memory.
[Overwriting mode] Sewing data is overwritten into the temporary buffer area.
If sewing data with the same program number already exists in internal memory, it
1
is deleted.
466
[Interrupt mode] Sewing data is overwritten into the temporary buffer area.
If sewing data with the same program number already exists in internal memory, it
is not deleted, but only the data in the temporary buffer is used.
2
(If sewing data with the same program number already exists in internal memory
and the setting is changed to “0” or “1”, the data in the temporary buffer will be
cleared.),
Changing gear ratio correction method when reading from a 2DD floppy disk.
Automatic conversion based on model type (For the BAS-342G, data is read as
0
BAS-342A data and then converted.)
467
1
BAS-311A data is read.
2
BAS-326A data is read.
3
BAS-341A/BAS-342A data is read.
Retract point switching at parallel movement point
468
OFF
Disabled
ON
The position moved to by parallel movement is recorded as the retract point.
Device settings
Setting
No.
Setting item
value
Needle cooler device
550
OFF
Disabled
ON
Needle cooler device is used (Option output No. 12)
Tension release setting at the sewing start
551
[Units: No. of stitches]
0−3
Tension release timing during thread trimming [Units: 8-degree steps]
552
-10 - 1
-10: Early  0: Standard 
 1: Late

11

BAS-342G

Default
value
300
200

0

ON

OFF

OFF

0

0

OFF

Default
value
OFF
0
0

2. FUNCTION SETTINGS

No.
554

555

556

557

558

559

560

561

562

563

564

*9

Setting
Setting item
value
Thread breakage detector
OFF
Disabled
ON
Fiber-type upper thread breakage detector is used
Detection sensitivity for thread breakage detector
OFF
5 stitches at sewing start, 3 stitches while sewing
ON
10 stitches at sewing start, 3 stitches while sewing
Inner clamping device (Option output No. 13)
0
Disabled
Inner clamping device is used (Retract operation is carried out at the sewing end
1
to prevent interference with the needle.)
Inner clamping device is used (No retract operation is carried out at the sewing
2
end)
Inner clamping device operates for 1/4 of the sewing pattern and returns for the
3
other 3/4. (No retract operation)
External wiper device
0
Disabled
1
Solenoid-type wiper device is used.
2
Pneumatic-type wiper device is used. (Option output No. 2)
External error monitoring input
OFF
Disabled
ON
Enabled (P10, option input No. 13 [AIRSW])
Operating indicator output
OFF
Disabled
Option output No. 9: Output during operation ON
Option output No. 10: ON during lower thread replacement and during test mode
ON
Option output No. 11: ON when error is generated
Automatic ejector (Option output No. 3 output, option input No. 1 = right sensor, input No. 2 = left
sensor)
0
Disabled
1
Operates as standard. (*9)
2
Sewing starts when cassette sensor is ON (*9)
3
Start switch is enabled even if cassette sensor is OFF. (*9)
Timer from sensor detection to sewing start when automatic ejector automatic starting is set
(memory switch No. 560 = 2)
0 - 999
Time from after the cassette is chucked until automatic starting
Changes the digital tension setting value.
OFF
Tension number can be changed regardless of the sewing data.
Only tension No. 0 and the tension numbers detected in the sewing data can be
ON
changed.
2-step thread tension device (when using spring-type main tension)
OFF
Disabled
ON
2-step thread tension device is used.
Increases maximum tension release force when using a spring-type main tension
0
Disabled (Thread tension discs are open at the sewing end.)
Increase the maximum tension release force (The thread tension discs close at the
sewing end. If the thread tension discs are open, they will be closed for
1
approximately 5 minutes.)
Maximum tension release force is set to maximum (The thread tension discs close
at the sewing end. If the thread tension discs are open, they will be closed for
2
approximately 1 minute.)

Default
value
OFF

OFF

0

1

OFF

OFF

0

100

ON

OFF

0

Set memory switch No. 002 to 0.

BAS-342G

12

2. FUNCTION SETTINGS

No.
566

567

568

Setting
Setting item
value
Thread nipper device (wiper replacement type)
OFF
Disabled
ON
Thread nipper device is used.
Thread tension disc status during feeding
OFF
Released
ON
Not released
Auxiliary tension release device
OFF
Disabled
Auxiliary tension release device is used.
ON
(Tension release operation is the same as if memory switch No. 564=0)

Error processing settings
Setting
No.
Setting item
value
Error release method when operation has stopped
0
Press the RESET key.
650
1
Press the RESET key or the STOP switch.
2
Press the RESET key or input a signal from the external switch (EXIN3).
Needle stop position when sewing is interrupted by the STOP switch
0
Needle stops in the down position.
651
1
Needle stops in the up position.
2
Needle stops in the up position after thread trimming.
Thread trimming operation when sewing is paused
652
OFF
Thread trimming is carried out when the pause is canceled.
ON
Thread trimming is not carried out when the pause is canceled.
Resuming sewing after sewing is paused
653
OFF
STOP switch 
 RESET key 

key 
 Sewing starts
ON
STOP switch 
 RESET key 
 Sewing starts
Disables the needle up stop position monitoring sensor
655
OFF
Sensor is enabled and needle up stop position errors [E110] are detected.
ON
Disabled
Home position return when sewing is paused
OFF
Mechanism moves to home position and then moves to sewing start position.
656
Mechanism steps back to the sewing start position along the sewing path without
ON
moving to the home position.

13

BAS-342G

Default
value
OFF

OFF

OFF

Default
value
0

0

OFF

OFF

OFF

OFF

2. FUNCTION SETTINGS

Maintenance settings
Setting
No.
Setting item
value
Run-in operation mode
0
Disabled
While the foot switch is being depressed, the work clamp moves up and down
once and then continuous operation starts. (No work clamp up/down movement
1
when memory switch No. 050=2 or 4)
750
While the foot switch is being depressed, the work clamp moves up and down
twice and then continuous operation starts. (No work clamp up/down movement
2
when memory switch No. 050=2 or 4)
While the foot switch is being depressed, the work clamp moves up and down
three times and then continuous operation starts. (No work clamp up/down
3
movement when memory switch No. 050=2 or 4)
Run-in operation cycle time adjustment timer
751
0 - 255
[Units x10 ms]
Sewing machine ID code
752
00 - 99
Sewing data specified on CF card
Reading/writing sewing data for old models
755
OFF
Only compatible with floppy disks.
ON
Reading and writing using CF cards is possible in data read/write mode.
Main shaft angle display mode
756
OFF
Disabled
ON
Main shaft angle is displayed when sewing machine starts.
Unique machine settings
Setting
No.
Setting item
value
Automatic start for extended option output No. 1
950
OFF
Disabled
ON
Sewing machine starts when extended option output No. 1 is ON.
Program number output
OFF
Disabled
951
When the last two digits of the program number are 1 to 15, the program number
ON
is output in 4 bits to extended option output 4 to 7.

BAS-342G

Default
value

0

20
00
OFF

OFF

Default
value
OFF

OFF

14

2. FUNCTION SETTINGS

2-5. Stitch counter checking method
1. While holding down the TEST key (1), press the
key
(2).
“Cnt” will be displayed in the PROGRAM No. display (3),
and the cumulative number of stitches will be displayed in
the menu display (4) in units of 100,000 stitches.
(While the
key (5) is being pressed, the cumulative
number of stitches will be displayed in units of 100
stitches in all 7 digits of the PROGRAM No. display and
the menu display (4).)
2. When the TEST key (1) is pressed, the display will return
to the normal display.

5058Q

15


1. When “Cnt” is displayed, press the
key (6). The
cumulative number of stitches will change to “0000” and
the display will flash.
2. Press the RESET key (7) for two seconds or more. (The
cumulative number of stitches “0000” will stop flashing
and illuminate, and the setting will be cleared. )
3. When the TEST key (1) is pressed, the display will return
to the normal display.

BAS-342G

2. FUNCTION SETTINGS

2-6. Error history checking method
The past error history can be checked by the following procedure.
1366B

TEST indicator illuminates, Menu indicator switches off.
key (1), turn on the power switch.
1. While pressing the
* Keep pressing the
key (1) until the model name is displayed and the buzzer beeps once.
The error history sequence number will be displayed in the PROGRAM No. display (2) and the error code will be
displayed in the menu display (3).
2. Press the
or
key (4) to switch the error history sequentially.
3. When the TEST key (5) is pressed, the display will return to the normal display and the sewing machine will change to
home position standby.

Details
If there is no error history
Error [E130] is displayed first.

PROGRAM No. display (2)
[000]
[001]

Menu display (3)
[E - - -]
[E130]

• While the
key (6) is being pressed, the COUNTER indicator will illuminate and the stitch number counter value at the
point where the error occurred will be displayed in the PROGRAM No. display (2) and the menu display (3) in units of 100
stitches.

BAS-342G

16

2. FUNCTION SETTINGS

2-7. Input checking method
Use this to check for any malfunctions of the operation panel keys, circuit boards or sensors, and for checking for broken
cords and for adjusting sensor positions.
You can check whether the CPU is correctly reading the signals from keys and sensors.

4565Q

1.

2.
3.
4.

4566Q

While pressing the
key (1), turn on the power switch.
* Keep pressing the
key (1) until the model name is displayed and the buzzer beeps once.
The check code will be displayed in the PROGRAM No. display (2), and the input status will be displayed in the menu
display (3).
Press the
key (1) or
key (4) to select the desired check code.
If no operations are carried out for 5 seconds after a check code has been selected, the check code and the abbreviated
input name will flash alternately in the PROGRAM No. display (2).
Refer to the input check list for key and sensor responses.
To return to normal operation, turn off the power switch and then turn it back on again.


PROGRAM No. display
Check code
Name

17

Menu display
Input status

[

1]

[orX]

[

H] / [ L]

[

2]

[EnX]

[-999] - [999]

[

3]

[orY]

[

[

4]

[EnY]

[-999] - [999]

[

5]

[orP]

[

[

6]

[EnP]

[-999] - [999]

[

7]

[Enn]

[

H] / [ L]

H] / [ L]

0] - [179]

Check item and checking method
X-axis motor home position sensor signal
Move the feed mechanism by hand in the X direction.
X-axis motor encoder counter value
Move the feed mechanism by hand in the X direction.
Y-axis motor home position sensor signal
Move the feed mechanism by hand in the Y direction.
Y-axis motor encoder counter value
Move the feed mechanism by hand in the Y direction.
Work clamp motor home position sensor signal
Operate the work clamp motor by hand.
Work clamp motor encoder counter value
Operate the work clamp motor by hand.
Upper shaft 180 degree rotation signal
Turn the pulley by hand.

BAS-342G

2. FUNCTION SETTINGS
PROGRAM No. display
Check code
Name

Menu display
Input status

[ 8]

[ UP]

[ on]/[oFF]

[ 9]

[ dn]

[ on]/[oFF]

[ 10]

[voL]

[0] - [300]

[ 11]

[PnL]

[*]/[ oFF]
* ON display
[rESt]
[tESt]
[tHrE]
[ tEn]
[SELE]
[UP-M]
[dn-M]
[ F1]
[ F2]
[ F3]
[ F4]
[ CF]

[ 12]

[FtA]

[0] - [255]

[ 13]

[CL1]

[ on]/[oFF]

[ 14]

[CL2]

[ on]/[oFF]

[ 15]

[Stt]

[ on]/[oFF]

[ 16]

[EMC]

[--on]
[on--]
[----]

[ 17]

[HEd]

[ on]/[oFF]

[ 18]
[ 19]
[ 20]
[ 21]
[ 22]
[ 23]
[ 24]
[ 25]
[ 26]
[ 27]

[Air]
[FnX]
[FnY]
[in1]
[in2]
[in3]
[in4]
[in5]
[rot]
[Fib]

[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]
[ on]/[oFF]

Check item and checking method
Needle up signal
Turn the pulley by hand.
Needle down signal
Turn the pulley by hand
Power supply voltage
Displayed as %
Operation panel key input check
While a key is being pressed, the name of the key will be
displayed.
Key name
RESET key
TEST key
THREAD/CLAMP key
TENSION/WIND key
SELECT key
key
key
Function key F1
Function key F2
Function key F3
Function key F4
R/W key
Foot switch analog value (when one pedal is installed)
Depress the foot switch.
Work clamp switch 1st step
Depress the work clamp switch to the 1st step.
Work clamp switch 2nd step
Depress the work clamp switch to the 2nd step.
Start switch
STOP switch
Press the STOP switch.
Safety switch
Tilt back the machine head.
External input error detection (IN13)
Cooling fan for X pulse motor
Cooling fan for Y pulse motor
Option input (IN1)
Option input (IN2)
Option input (IN3)
Option input (IN4)
Option input (IN5)
No devices are compatible with the BAS-342G.
Fiber-type thread breakage detection (option) (IN14)

BAS-342G

18

2. FUNCTION SETTINGS

PROGRAM No. display
Check code
Name
[ 28]
[Por]
[ 29]
[Xor]
[ 30]
[Yor]
[ 31]
[in6]
[ 32]
[in7]
[ 33]
[in8]
[ 34]
[in9]
[ 35]
[in10]

19

Menu display
Input status
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]
[ on] / [ oFF]

Check item and checking method
Work clamp home position sensor
X-feed home position sensor
Y-feed home position sensor
Option input (IN6)
Option input (IN7)
Option input (IN8)
Option input (IN9)
Option input (IN10)

BAS-342G

2. FUNCTION SETTINGS

2-8. Output checking method
Use this to check for any malfunctions of the circuit boards, and for checking for problems with drive mechanisms and broken
cords.
You can check whether the signals being output by the CPU are driving the mechanisms correctly.
4567Q

1. While pressing the
key (1), turn on the power switch.
key (1) until the model name is
* Keep pressing the
displayed and the buzzer beeps once.
The check code will be displayed in the PROGRAM No.
display (2), and the abbreviated name of the output will
be displayed in the menu display (3).
2. Press the
key (4) or
key (1) to select the desired
check code.
3. The operations for check codes 51 to 54 can be checked
by pressing the
or
key (5).
4. For check codes 55 and after, lower the work clamp and
then depress the start switch (6).
The corresponding operation for the check code will
be carried out while the start switch is being
depressed (while the start switch has been
depressed once for check code 60).

5.

To return to normal operation, turn off the power switch
and then turn it back on again.

4953Q

Program No.
display
Check code

Operating details

Name

[ 51]

[PM-X]

[ 52]

[PM-y]

[ 53]

[PM-F]

[ 54]
[ 55]
[ 56]
[ 57]
[ 58]
[ 59]

[CAtH]
[CL-r]
[CL-L]
[SUPt]
[FLiP]
[CooL]

[ 60]
*1

Menu display

key is pressed, the work clamp moves to the left.
When the
When the
key is pressed, the work clamp moves to the right.
key is pressed, the work clamp moves forward.
When the
key is pressed, the work clamp moves back.
When the
key is pressed, the work clamp is raised.
When the
key is pressed, the work clamp is lowered.
When the
No devices are compatible with the BAS-342G.
The right clamp valve (clamp valve 1) is turned ON (OUT16) (*1)
The left clamp valve (clamp valve 2) is turned ON (OUT15) (*1)
Auxiliary tension release valve is turned ON (OUT14) (*1)
Inner clamping device valve is turned ON (OUT13) (*1)
Needle cooling valve is turned ON (OUT12) (*1)
The panel LEDs illuminate in order, and then the seven segments of the
PROGRAM No. display and the menu display illuminate one by one.

Applies when corresponding devices are installed.

BAS-342G

20

2. FUNCTION SETTINGS

PROGRAM No.
display
Check code
[ 61]

*2

21

Menu display
[

Name
CUt]

[ 62]

[ rEL] / [dtEn]

[ 63]
[ 64]
[ 65]
[ 66]
[ 67]
[ 68]
[ 69]
[ 70]
[ 71]
[ 72]
[ 73]
[ 74]
[ 75]
[ 76]
[ 77]
[ 78]
[ 79]

[ WiP]
[StEP]
[ oP1]
[ oP2]
[ oP3]
[ oP4]
[ oP5]
[ oP6]
[ oP7]
[ oP8]
[ oP9]
[oP10]
[oP11]
[oP17]
[oP18]
[oP19]
[oP20]

Operating details
Turns on the thread trimming solenoid.
Turns on the tension release solenoid/digital tension solenoid.
(*2)
However, in the case of digital tension, the solenoid turns on at the tension
that has been set.
Turns on the thread wiper solenoid.
No devices are compatible with the BAS-342G.
Turns on option output 1.
Turns on option output 2.
Turns on option output 3.
Turns on option output 4.
Turns on option output 5.
Turns on option output 6.
Turns on option output 7.
Turns on option output 8.
Turns on option output 9.
Turns on option output 10.
Turns on option output 11.
Turns on option output 17.
Turns on option output 18.
Turns on option output 19.
Turns on option output 20.

Can be determined automatically using a connector shorting pin.

BAS-342G

2. FUNCTION SETTINGS

2-9. Software version checking method
5059Q

TEST indicator illuminates, Menu indicator switches off
1.

2.

While pressing the
key (1), turn on the power. The software version will be displayed in the menu display (2).
key (1) until the model name is displayed and the buzzer beeps once.
* Keep pressing the
The display in the PROGRAM No. display (4) switches as follows each time the
or
key (3) is pressed.
PROGRAM No. display (4)
[1.Mn]
[2.Mt]
[3.PL]
[4.iP]
[5.PG]

3.

Software
Main CPU
Motor CPU
Panel CPU
Main CPU (IPL)
Programmer

When the TEST key (5) is pressed, the display will return to the normal display and the sewing machine will change to
home position standby.

BAS-342G

22

3. READING / WRITING DATA

3. READING / WRITING DATA
3-1. Handling data
Program numbers (100 − 999) are read from CF cards.
Program numbers (0 − 99) are older BAS-300 series, BAS-300A series and BAS-300E/F series data and can be read from
floppy disks.
However, when memory switch No. 755 is set to ON, data for older series models (program numbers 0 − 99) can be
transferred from a floppy disk to a CF card using a computer and then be read from the CF card.
* In such cases, the effective reading mode will be [r 1].

Option

0 - 99

100 - 999

or
r9 mode

or
r1 mode

0 − 99

100 − 999

Old model series data range
(BAS***.SEW)

BAS-311G, BAS-326G, BAS-342G data range
ISM***.SEW

Sewing machine internal memory

When memory switch
r1 mode

Old model series data copied from floppy
disk to CF card
(0 − 99)

23

or

No. 755 = ON

r1 mode

100 − 999

BAS-342G

3. READING / WRITING DATA

3-2. Notes on handling CF cards (sold separately)
・
・
・
・
・
・
・
・
・
・
・

Use CF cards with a capacity of 32MB, 64MB, 128MB, 256MB, 512MB, 1GB or 2 GB. (Cards which are larger than 2GB
cannot be used.)
Do not disassemble or modify the CF card.
Do not bend, drop or scratch CF cards or place heavy objects on top of them.
Avoid contact with liquids such as water, oil, solvents or drinks.
Use and store CF cards in locations that are free from strong static electricity and electrical interference.
Do not use or store CF cards in places where they may be subject to vibrations or shocks, direct sunlight, high
temperature or humidity or strong magnetic fields from equipment such as speakers, or places which are dusty from
thread scraps, etc.
Do not subject CF cards to shocks or impacts or remove them from the sewing machine while data is being loaded or
written.
The data on the CF cards may become lost or corrupted due to some malfunction or accident. It is recommended that
you make a backup of important data.
CF cards should only be removed after the power for the sewing machine has been turned off.
CF cards are already formatted when they are purchased, and so you should not reformat them.
The recommended CF cards are commercially-available ones from SanDisk or HAGIWARA SYS-COM. CF cards from
other manufacturers can be used, but different formatting methods may mean that loading from or writing to such cards
may not be possible.

For more information, refer to the documentation provided with the CF card.
* This product is compatible with CF cards that have been formatted using the FAT16 method. Cards that have been
formatted using the FAT32 method cannot be used.
* CFTM is a trademark of SanDisk Corporation.
* Company names and product names appearing in this manual are trademarks or registered trademarks of the
respective owners. However, no TM or other similar symbols appear in the main text of this manual.

3-3. Structure of a CF card folder

*1

\BROTHER\ISM\ISMSYS\ISM05MN.MOT
\BROTHER\ISM\ISMDD00\ISMMSW.SEW
*1 \ISMUPG.SEW
\ISMS0100.SEW
\ISMS0101.SEW
\ISMS0102.SEW

: Control program
: Memory switch data
: User program data
: Sewing data P No. = 100
: Sewing data P No. = 101
: Sewing data P No. = 102

\BROTHER\ISM\ISMDB00\ISMLDT00\

: Log data

The underlined portion of the name of the \BROTHER\ISM\SMDB00 folder for sewing data can be changed by changing
the setting for memory switch No. 752 in order to change the folder name. Change the folder name if you would like to
store sewing data for different sewing machines on a single CF card.

BAS-342G

24

3. READING / WRITING DATA

3-4. Data read/write mode
1

With the power turned off, insert the CF card into the CF
slot.
NOTE:
• Make sure the CF card is facing the correct way.
• Always be sure to keep the cover closed except
when inserting and removing the CF card. If this is
not done, dust may get inside and cause problems
with operation.
• If no valid data can be found, the CF media
indicator will not illuminate.
4453Q

2
3

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

While pressing the TEST key, press the R/W key.

• The mode number will appear in the PROGRAM No.
display, and the setting details for that mode will
appear in the menu display.
• The initial mode is sewing data reading mode. (Refer
to the read/write mode list)

4574Q

TEST indicator and CF media indicator illuminate

4

Press the

or

key to select the mode.

4575Q

[Read/write mode list]
PROGRAM No.
Menu display
Setting items
display
r1
[-SEd]
Sewing data is read from the CF card. (*1)
w2
[SEd-]
Sewing data is written to the CF card.
r3
[-MEM]
Memory switch settings are read from the CF card.
w4
[MEM-]
Memory switch settings are written to the CF card.
r5
[-UPG]
User programs are read from the CF card.
w6
[UPG-]
User programs are written to the CF card.
r7
[-SyS]
Control programs are read from the CF card and used to update the firmware version.
w8
[LoG-]
Error log data is written to the CF card.
r9
[-Fdd]
Sewing data is read from the floppy disk. (*2) (*3)
w 10
[Fdd-]
Sewing data is written to the floppy disk. (*2)
r 11
[-EoP]
Extended option output (*4) data is read from the CF card.
w 12
[EoP-]
Extended option output data is written to the CF card.
r 13
[oPFd]
Extended option output data is read from the floppy disk. (*2)
*1 The sewing data that can be use with this sewing machine is data that has been created for the BAS-311G/BAS-326G
/BAS-342G.
*2 Only valid when using an optional floppy disk drive.
*3 Sewing data for the BAS-300 series, BAS-300A series and BAS-300E/F series can be read.
*4 Refer to the instruction manual for the programmer for details on extended option output.

25

BAS-342G

3. READING / WRITING DATA

3-5. Reading sewing data from CF cards
1

Select the [r 1] data read/write mode.

4576Q

2

Press the R/W key.

• [-SEd] will change to [ ALL].
Press the
or
key to select the program number (100 - 999) to be
read.
* If [ ALL] is selected, all sewing data (Nos. 100 - 999) will be read at
once.
[When memory switch No. 755 is ON]
The program number (0 − 99) is also displayed and can be selected.
If you select [ ALL] at this time, all sewing data (Nos. 0 - 999) will be
read at once.
4577Q

3

Press the R/W key.

• The buzzer will sound and the selected sewing data will be loaded
from the CF card and copied into the sewing machine's internal
memory.
• The program numbers that have been read will be displayed in the
menu display.
* If there is a large volume of data in the CF card, it will take some time
for all of it to be read. To halt the reading of data, press the STOP
switch. If you then press the RESET key, the display will change back
to [ ALL].

4976Q

Loading

4

End data read/write mode

Press the TEST key.
Turn off the power switch, remove the CF card, and then close the cover
of the CF slot.

TEST indicator switches off

BAS-342G

26

3. READING / WRITING DATA

3-6. Writing sewing data to CF cards
1

Select the [w 2] data read/write mode.

4578Q

2

Press the R/W key.

• [SEd-] will change to [ ALL].
or
key to select the program numbers (100 - 999) to be
Press the
written.
* If you select [ ALL], all sewing data (Nos. 100 - 999) will be written at
once.
[When memory switch No. 755 is ON]
The program numbers (0 - 99) will also be displayed and can be selected.
If you select [ ALL] at this time, all sewing data (Nos. 0 - 999) will be
written at once.
4577Q

3

Press the R/W key.

• The buzzer will sound and the selected sewing data will be copied from
the internal memory onto the CF card.
• The program numbers that have been written will appear in the
PROGRAM No. display.
* If there is a large volume of data in the internal memory, it will take
some time for all of it to be written. To halt the writing of data, press the
STOP switch. If you then press the RESET key, the display will change
back to [ ALL].

4977Q

Writing

4

End data read/write mode

Press the TEST key.
Turn off the power switch, remove the CF card, and then close the cover
of the CF slot.

TEST indicator switches off

27

BAS-342G

3. READING / WRITING DATA

3-7. Reading memory switch data from CF cards
1

Select the [r 3] data read/write mode.

4580Q

2

Press the R/W key.

• The buzzer will sound and the memory switch data will
be loaded from the CF card and copied into the sewing
machine's internal memory.

4498Q

Loading

3

When [ End] is displayed, the process is complete.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

4581Q

3-8. Writing memory switch data to CF cards
1

Select the [w 4] data read/write mode.

4582Q

2

Press the R/W key.

• The buzzer will sound and the memory switch data will
be copied from the internal memory onto the CF card.
4579Q

Writing

3 End data read/write mode

Press the TEST key.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

TEST indicator switches off

BAS-342G

28

3. READING / WRITING DATA

3-9. Reading user program data from CF cards
1

Select the [r 5] data read/write mode.

4583Q

2

Press the R/W key.

• The buzzer will sound and the user program data will
be loaded from the CF card and copied into the sewing
machine's internal memory.
4498Q

Loading

3

When [ End] is displayed, the process is complete.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

4581Q

3-10. Writing user program data to CF cards
1

Select the [w 6] data read/write mode.

4584Q

2

Press the R/W key.

• The buzzer will sound and the user program data will
be copied from the internal memory onto the CF card.
4579Q

Writing

3 End data read/write mode

Press the TEST key.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

TEST indicator switches off

29

BAS-342G

3. READING / WRITING DATA

3-11. Updating the control program
1

Select the [r 7] data read/write mode.

4585Q

2

Press the R/W key.

• [-SyS] will be displayed for a certain amount of time,
and then the display will change to [ vEr], and after that
the version number of the control program that is
stored on the CF card will be displayed.

3

Press the R/W key.

• [ P] will flash in the PROGRAM No. display and the
control program will be updated.
NOTE:
If the filename and folder name for the control program
are incorrect, error [E421] will be displayed.

5060Q

4

When [ End] is displayed, the process is complete.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

4581Q

NOTE:
• Version updating may take about 3 − 10 minutes.
(The time taken will vary depending on the
manufacturers and storage capacity of the CF card
being used. )
• Never remove the CF card or turn off the power
switch while reading of the CF card is in progress.


If the version updating did not complete normally, such as because of a power outage, the sewing machine will not
operate correctly.
If this happens, restore the control program by the following procedure.
1. Insert the CF card containing the control program data into the CF card slot.
2. Turn on the power switch. The operation panel will switch off and the version updating will be carried out.
3. When the initial screen turns back on, the updating is complete. Turn off the power switch, remove the CF card, and
then close the cover of the CF slot.

BAS-342G

30

3. READING / WRITING DATA

3-12. Writing error log data to CF card
1

Select the [w 8] data read/write mode.

5061Q

2

Press the R/W key.

• The buzzer will sound and the error log data will be
copied from the internal memory onto the CF card.
4579Q

Writing

3 End data read/write mode

Press the TEST key.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

TEST indicator switches off

3-13. Reading sewing data from floppy disks
1
2

Insert the floppy disk into the floppy disk drive.
Select the [r 9] data read/write mode.

5062Q

3

Press the R/W key.

• [-Fdd] will change to [ ALL].
Press the
or
key to select the program number to be read.
* Program numbers that contain no data will also be displayed at this
time.
* If [ ALL] is selected, all sewing data will be read at once.
4577Q

31

BAS-342G

3. READING / WRITING DATA

4

Press the R/W key.

• The buzzer will sound and the selected sewing data will be loaded
from the floppy disk and copied into the sewing machine's internal
memory.
• The program numbers that have been read will appear in the menu
display.
* If there is a large volume of data in the floppy disk, it will take some
time for all of it to be read.
To halt the reading of data, press the STOP switch. If you then
press the RESET key, the display will change back to [ ALL].
NOTE:
If there is no data in the selected program number, error [E421] will
be displayed. Press the RESET key and then select another
program number.

5063Q

Loading

5

End data read/write mode

Press the TEST key.
Turn off the power and remove the floppy disk.

TEST indicator switches off

3-14. Writing sewing data to floppy disks
1
2

Insert the floppy disk into the floppy disk drive.
Select the [w 10] data read/write mode.

5064Q

3

Press the R/W key.

• [Fdd-] will change to [ ALL].
Press the
or
key to select the program number to
be written.
* If [ ALL] is selected, all sewing data will be written at
once.
4577Q

BAS-342G

32

3. READING / WRITING DATA

4

Press the R/W key.

• The buzzer will sound and the selected sewing data will
be copied from the internal memory onto the floppy disk.
• The program numbers that have been written will
appear in the menu display.
* If there is a large volume of data in the internal memory,
it will take some time for all of it to be written.
To halt the writing of data, press the STOP switch. If
you then press the RESET key, the display will change
back to [ ALL].

5065Q

Writing

5

End data read/write mode

Press the TEST key.
Turn off the power and remove the floppy disk.

TEST indicator switches off

3-15. Reading extended option output data from a CF card
1

Select the [r 11] data read/write mode.

5066Q

2

Press the R/W key.

• The buzzer will sound and the extended option output
data will be loaded from the CF card and copied into
the sewing machine's internal memory.
4498Q

Loading

3

When [ End] is displayed, the process is complete.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

4581Q

33

BAS-342G

3. READING / WRITING DATA

3-16. Writing extended option output data to CF cards
1

Select the [w 12] data read/write mode.

5067Q

2

Press the R/W key.

• The buzzer will sound and the extended option output
data will be copied from the internal memory onto the
CF card.
4579Q

Writing

3

Press the TEST key.
Turn off the power switch, remove the CF card, and then
close the cover of the CF slot.

End data read/write mode

TEST indicator switches off

3-17. Reading extended option output data from floppy disks
1
2

Insert the floppy disk into the floppy disk drive.
Select the [r 13] data read/write mode.

5068Q

3

Press the R/W key.

• The buzzer will sound and the extended option output
data will be loaded from the floppy disk and copied into
the sewing machine's internal memory.
5069Q

Loading

4

When [ End] is displayed, the process is complete.
Turn off the power and remove the floppy disk.

5070Q

BAS-342G

34

4. MECHANICAL DESCRIPTIONS

4. MECHANICAL DESCRIPTIONS
The mechanisms operate in the order of the numbers given in the illustrations.

4-1. Needle bar and thread take-up mechanisms

1232B

1.
2.
3.
4.
5.

Motor assembly
Upper shaft
Thread take-up crank
Needle bar crank
Needle bar
connecting rod
6. Needle bar clamp
7. Needle bar

<5> Thread take-up
lever assembly
<6> Thread take-up
support

4-2. Lower shaft and shuttle race mechanisms

1233B

1. Motor assembly
2. Upper shaft
3. Crank rod assembly
4. Rock gear
5. Lower gear
6. Lower shaft
7. Lower shaft adjusting bush
8. Lower shaft M bush
9. Driver
10. Shuttle hook

35

BAS-342G

4. MECHANICAL DESCRIPTIONS

4-3. Work clamp lifter mechanism

1234B

1. Air cylinder
2. Work clamp lifter lever
3. Work clamp lifter lever
4. Work clamp

4-4. Intermittent presser foot lifter mechanism

1. Work clamp pulse motor
2. Work clamp driving gear
3. Work clamp cam gear
4. Stepping foot driving lever
5. Stepping clamp lifter rod
6. Stepping clamp lifter
7. Stepping clamp lifter link
8. Stepping clamp link
9. Stepping clamp link B
10. Presser bar clamp
11. Presser bar
12. Intermittent presser foot

1235B

BAS-342G

36

4. MECHANICAL DESCRIPTIONS

4-5. Intermittent presser foot stroke mechanism

1236B

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

37

BAS-342G

Motor assembly
Upper shaft
Stepping clamp cam
Stepping clamp connecting rod
Stepping clamp arm R
Stepping clamp arm F
Stepping clamp link A
Stepping clamp link A
Stepping clamp link B
Presser bar clamp
Presser bar
Intermittent presser foot

4. MECHANICAL DESCRIPTIONS

4-6. Feed mechanism
Sewing patterns are created through combinations of X and Y movements.

X direction

1237B

1. X-feed motor assembly
2. Y motor gear
3. X gear
4. X-GT belt
5. X base plate
6. Y base plate

Y direction

1238B

1. Y-feed motor assembly
2. Y motor gear
3. Y gear
4. Y-GT belt
5. Y-arm
6. X-LM guide bracket
7. Work clamp arm

BAS-342G

38

4. MECHANICAL DESCRIPTIONS

4-7. Thread trimmer mechanism

1239B

1. Thread trimmer solenoid
2. Solenoid lever
3. Pushing lever
4. Driving lever
5. Thread trimmer collar
6. Thread trimmer cam
7. Thread trimmer rod V
8. Thread trimmer lever V
9. Thread trimmer lever H
10. Thread trimmer rod H
11. Movable knife lever D
12. Movable knife lever
13. Movable knife connecting plate
14. Movable knife
15. Fixed knife

39

BAS-342G

4. MECHANICAL DESCRIPTIONS

4-8. Tension release mechanism

1. Tension release solenoid
2. Bolt
3. Tension release bar
4. Tension release pin

5049Q

4-9. Thread wiper mechanism

5050Q

1. Thread wiper solenoid assembly
2. Thread wiper rod
3. Thread wiper crank assembly
4. Wiper

When the thread wiper solenoid assembly is turned off,
the wiper operates in the opposite direction.

BAS-342G

40

5. DISASSEMBLY

5. DISASSEMBLY
CAUTION
Disassembly should only be carried out by a
qualified technician.
Turn off the power switch before carrying out
disassembly. If the foot switch is depressed by
mistake, the sewing machine might start operating
and injury could result.
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. If the oil
and grease get into your eyes or onto your skin,
inflammation can result.
Furthermore, do not drink or eat the lubricating oil or
grease. They may cause diarrhea or vomiting.
Keep the oil out of the reach of children.

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.

Disassemble each part in order of the numbers.

5-1. Covers

1240B

1.
2.
3.
4.
5.

41

Top cover
Motor cover
X motor cover
Rear cover
Rear cover FR

6.
7.
8.
9.

Rear cover FL
Eye guard
Face plate
Shuttle race cover assembly

BAS-342G

5. DISASSEMBLY

5-2. Thread wiper mechanism

5090Q

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

Thread wiper solenoid harness (Pull out)
STOP switch harness (Pull out)
Bolt
Plain washer
Removed plain washer (Assemble)
Removed bolt (Assemble)
Bolts with washers [2 pcs]
8. Thread wiper unit

BAS-342G

42

5. DISASSEMBLY

5-3. Work clamp arm mechanism

1241B

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

43

Set screw
Needle
Needle bar thread guide
Bolts [8 pcs]
Bolts with washers [4 pcs]
Screws [2 pcs]
Work clamp arm assembly
Bolts with washers [2 pcs]
Feed plate

BAS-342G

5. DISASSEMBLY

5-4. Intermittent presser foot lifter mechanism (1)

1242B

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

Adjusting screw nut (Loosen)
Presser adjusting screw
Presser bar spring guide
Presser bar spring
Presser bar spring collar
Screw
Shoulder screw
Screw
Plain washers [2 pcs]
Finger guard

BAS-342G

11. Intermittent presser foot
12. Bolt (Loosen)
13. Presser bar
(Pull downward from presser bar clamp)
14. Set screw (Loosen)
15. Stepping clamp lifter link shaft (Pull out)
16. Washer
17. Stepping clamp lifter link (Remove as unit)
18. Presser bar
19. Bolt (Loosen)
20. Stepping clamp arm F

44

5. DISASSEMBLY

5-5. Needle bar mechanism

5092Q

Left-hand thread

5093Q

Do not remove the slide block guide if
possible to prevent the machine from
overheating due to needle bar rubbing.
1. Rubber cap
2. Screw
3. Needle bar
4. Needle bar clamp (Pull out)
5. Slide block
6. Rubber caps [2 pcs]
7. Set screws [2 pcs] (Loosen)
8. Thread take-up support shaft
assembly
9. Thread take-up support
10. Screw (Loosen)

45

11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Needle bar connecting rod
Needle bearing
Rubber cap
Set screws [3 pcs] (Loosen)
Needle bar crank
Needle bearing
Thread take-up lever assembly
Washer
Bolts [2 pcs]
Slide block guide

BAS-342G

5. DISASSEMBLY

5-6. Upper shaft mechanism

Be careful not to drop the needle
bearing.

If the motor assembly cannot be removed,
insert bolts into these two tapping holes
and gradually tighten them to remove the
motor assembly.

1243B

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

Screw (Loosen)
Set screw (Loosen)
Thread take-up crank
Screws [3 pcs] (Loosen)
Crank cover
Bolts [2 pcs]
Crank rod [Upper part]
Needle bearing
Crank rod [Lower part]
(Lower downward）
Rubber cap
Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)

BAS-342G

16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.

Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)
Set screws [2 pcs] (Loosen)
Screws [3 pcs] (Loosen)
Fries wheels [2 pcs]
Bolts [4 pcs] (Loosen)
Motor assembly
Thread trimmer cam
Joint assembly
Upper shaft
Pulley gear R
Bobbin winder driving wheel
Stepping clamp cam assembly
Set screw (Loosen)
Pulley assembly

46

5. DISASSEMBLY

5-7. Lower shaft mechanism

1244B

If the adjusting stud will not pull out,
insert a M3 screw into the tap hole and
then pull out the adjusting stud.

1245B

1246B

Remove the rock gear and the crank
rod together as a single unit.

1247B

47

BAS-342G

1. Bolt (Loosen)
2. Driver
3. Set screws [2 pcs] (Loosen)
4. Set screws [2 pcs] (Loosen)
5. Set screws (Loosen)
6. Lower shaft bush
7. Lower shaft assembly
(Pull out from the rear of the machine)
8. Set screw collar
9. Set screw collar
10. Set screw (Loosen)
11. Lower shaft M bush
12. Set screw (Loosen)
13. Adjusting stud (Pull out)
14. Set screw (Loosen)
15. Adjusting stud (Pull out)
16. Set screw (Loosen)
17. Shuttle race base assembly
18. Set screws [2 pcs] (Loosen)
19. Bolt (Loosen)
20. Pinch sleeve A
21. Pinch sleeve B
22. Set screw (Loosen)
23. Set screw collar R
24. Set screws [2 pcs] (Loosen)
25. Rock gear shaft
(Pull out from the rear of the machine)
26. Set screw collar B
27. Rock gear
28. Crank rod [Lower part]

5. DISASSEMBLY

5-8. Feed covers

1248B

1. Bolts with washers [14 pcs]
2. Auxiliary plate
3. Screws [4 pcs]
4. Bellow assembly
5. Screws [6 pcs]
6. Inside cover R
7. Inside cover L
8. Bolts [20 pcs]
9. Cover rail FL assemblies [2 pcs]
10. Cover rail FR assemblies [2 pcs]
11. Outside cover assemblies [2 pcs]
12. Middle cover assemblies [2 pcs]
13. Screws [14 pcs]
14. Fixations [2 pcs]

1249B

BAS-342G

48

5. DISASSEMBLY

5-9. Feed mechanism
1. Bolts with washers [2 pcs]
2. Bolts [16 pcs]
3. Y base plate assembly
4. Bolts [4 pcs]
5. Belt holder
6. Bolts [16 pcs]
7. X base plate
8. Screws [2 pcs]
9. Fan bracket
10. Screws [4 pcs]
11. Fan
12. Bolts with washers [4 pcs]
13. X motor bracket
14. Bolts [4 pcs]

1250B

1251B

1252B

49

BAS-342G

15. X motor
16. Set screws [2 pcs] (Loosen)
17. X motor gear
18. Set screws [8 pcs] (Loosen)
19. Retaining rings C [2 pcs]
20. X drive shaft
21. X gear
22. Pulley B assembly
23. Set screws [2 pcs] (Loosen)
24. Pulley fulcrum shaft
25. Pulley A assembly
26. Pulley fulcrum shaft collar
27. X pulley bracket
28. X-GT belt

5. DISASSEMBLY
29. Bolts with washers [4 pcs]
30. Bolts with washers [8 pcs]
31. Belt holders [2 pcs]
32. Bolts with washers [4 pcs]
33. Bolts [4 pcs]
34. Y motor bracket
35. Set screws [2 pcs] (Loosen)
36. Y motor gear
37. Y motor
38. Screws [3 pcs]
39. Y gear cover
40. Bolts [2 pcs]
41. Fan bracket
42. Screws [4 pcs]
43. Fan
44. Set screws [12 pcs] (Loosen)
45. Y drive shaft
46. Pulley B assemblies [2 pcs]
47. Y gear
48. Set screws [4 pcs] (Loosen)
49. Pulley fulcrum shafts [2 pcs]
50. Pulley fulcrum shaft collars [2 pcs]
51. Pulley A assemblies [2 pcs]
52. Y pulley brackets [2 pcs]
53. Y-GT belts [2 pcs]

1253B

1254B

1255B

BAS-342G

50

5. DISASSEMBLY

5-10. Work clamp lifter mechanism
1. Bolt
2. Bolts [4 pcs]
3. Pulse motor assembly P (Disconnect the harness)
4. Set screws [2 pcs] (Loosen)
5. Work clamp driving gear
6. Bolts [2 pcs]
7. Work clamp motor plate
8. Set screws [2 pcs] (Loosen)
9. Set screw
10. Work clamp lever shaft

11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Set screw collar
Stepping work clamp driving lever
Set screw (Loosen)
Set screw (Loosen)
Screw
Plain washer
Retaining ring C
Work clamp fulcrum shaft
Work clamp cam gear
Ball bearings [2 pcs]

1256B

51

BAS-342G

5. DISASSEMBLY

5-11. Tension release mechanism
1. Set screw (Loosen)
2. Tension bracket assembly
(Pull out)
3. Tension release pin
4. Shoulder screws [2 pcs]
5. O rings [2 pcs]
6. Solenoid cover
7. Tension release solenoid
8. Bolts [2 pcs]
9. Spring washers [2 pcs]

10.
11.
12.
13.
14.
15.
16.
17.
18.
19.

Plain washers [2 pcs]
Solenoid setting plate
Bolt
Nut
Plain washer
Solenoid cushion
Tension release bar
Plain washer
Compression spring
Retaining ring E

5111Q

5-12. Intermittent presser foot lifter mechanism (2)

1. Bolts [2 pcs]
2. Stepping clamp lifter rod holder
3. Flat screw
4. Set screw (Loosen)
5. Stepping clamp lifter shaft (Pull out)
6. Stepping clamp lifter (Pull forward)

1257B

BAS-342G

52

5. DISASSEMBLY

5-13. Thread trimmer mechanism

1317B

1258B

1. Set screws [2 pcs] (Loosen)
2. Thread trimmer cam
3. Screws [3 pcs]
4. Fan
5. Bolts with washers [2 pcs]
6. Solenoid setting plate
7. Set screw
8. Solenoid lever
9. Washer
10. Solenoid cushion
11. Bolts [2 pcs]
12. Spring washers [2 pcs]

53

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

Plain washers [2 pcs]
Thread trimmer solenoid
Shoulder screw
Driving lever pushing lever
Nut
Set screw
Set screw
Guide shaft
Compression spring
Cushion

BAS-342G

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

Nut
Shoulder screw B
Thread driving lever
Set screw
Retaining ring E
Collar shaft
Thread trimmer collar
Screws [2 pcs]
Flat screws [2 pcs]
Needle plate

5. DISASSEMBLY

33. Movable knife shoulder
screw
34. Thrust washer
35. Movable knife collar
36. Movable knife assembly
37. Movable knife spacer
38. Screws [2 pcs]
39. Plain washers [2 pcs]
40. Fixed knife
41. Shoulder screw
42. Movable knife connecting
plate
43. Spring hook
44. Extension spring
45. Bolt
46. Spring washer
47. Plain washer
48. Nut
49. Shoulder screw B

50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.

Thread trimmer rod V
Nut
Shoulder screw B
Set screws [2 pcs] (Loosen)
Thread trimmer lever shaft
Spacers [2 pcs]
Retaining ring C
Thread trimmer lever V
Thread trimmer lever H
Set screws [2 pcs] (Loosen)
Movable knife lever shaft

1259B

61.
62.
63.
64.
65.
66.
67.
68.

Movable knife lever
Bolt
Spring washer
Plain washer
Movable knife lever D
Nut
Shoulder screw
Thread trimmer rod H

5-14. Shuttle hook mechanism

1. Bobbin case assembly
2. Shuttle race base setting claw
（Open to right and left）
3. Shuttle race base
4. Shuttle hook
BAS-342G

1318B

54

6. ASSEMBLY

6. ASSEMBLY
Assemble each part in order of the numbers.

Apply grease to the required places when reassembling the parts and once every two years.

6-1. Thread trimmer mechanism (1)
Apply the grease  specified by Brother in the places indicated by
When the ball joint assembly of the thread trimmer
rod H (6) has been disassembled, assemble it so
that the distance between the centers of the holes
is 527 ± 0.5 mm.

.

Tighten the two set screws (16) on the
screw stop while lightly pressing the thread
trimmer lever shaft.

1267B

Tighten the set
screw on the
screw stop while
lightly pressing the
movable knife
lever shaft.

1268B

55

BAS-342G

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

Movable knife lever
Movable knife lever D
Plain washer
Spring washer
Bolt
Thread trimmer rod H
Shoulder screw
Nut
Movable knife lever shaft
Set screws [2 pcs]
Thread trimmer lever shaft
Retaining ring C
Spacers [2 pcs]
Thread trimmer lever H
Thread trimmer lever V
Set screws [2 pcs]
Shoulder screw B
Nut
Extension spring
Spring hook

6. ASSEMBLY

Assemble so that the wick is
hanging down.

Tighten the set screw (25) on the
screw stop while lightly pressing the
collar shaft (23).
Check that the thread trimmer collar
(22) turns smoothly.

1270B

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

1269B

Apply grease.

Thread driving lever
Thread trimmer collar
Collar shaft
Retaining ring E
Set screw
Thread trimmer rod V
Shoulder screw B
Nut
Guide shaft
Compression spring
Cushion
Set screw
Thread trimmer solenoid
Solenoid bracket
Plain washers [2 pcs]
Spring washers [2 pcs]
Bolts [2 pcs]

38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.

Solenoid cushion
Washer
Solenoid lever
Set screw
Bolts with washers [2 pcs]
Driving lever pushing lever
Shoulder screw
Set screw
Nut
Movable knife connecting plate
Shoulder screw
Shoulder screw B
Nut
Plain washer
Spring washer
Bolt

When the ball joint assembly of the
thread trimmer rod V (26) has been
disassembled, assemble it so that
the distance between the centers of
the holes is 287.5 ± 0.5 mm.

4615Q

BAS-342G

56

6. ASSEMBLY

6-2. Intermittent presser foot lifter mechanism (1)
Tighten the set screw (3) on the screw stop
while lightly pressing the stepping clamp lifter
shaft (2).



1272B

Screw the stepping clamp lifter rod in as far as
it will go, then turn it back 3 times.

Place the oil tube into
the groove.

1. Stepping clamp lifter (Insert from the front)
2. Stepping clamp lifter shaft
3. Set screw
4. Flat screw

1271B

6-3. Tension release mechanism

Adjust while referring to “7-18.
Adjusting the tension release amount”.
Adjust the thread take-up
spring height while referring to
“7-2. Standard thread tension”.

5139Q

57

BAS-342G

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

Tension release bar
Retaining ring E
Plain washer
Compression spring
Tension release solenoid
Solenoid setting plate
Solenoid cushion
Plain washer
Nut
Bolt
Plain washers [2 pcs]
Spring washers [2 pcs]
Bolts [2 pcs]
Solenoid cover
O rings [2 pcs]
Shoulder screws [2 pcs]
Tension release pin
Tension bracket
Set screw

6. ASSEMBLY

6-4. Work clamp lifter mechanism
Apply the grease  specified by Brother in the places indicated by

.

Set the work clamp cam gear (2) so that there is no
clearance between it and the ball bearing in the shaft
direction, and then align the V groove in the work clamp
fulcrum shaft (3) with the thread on the hole side of the
work clamp cam gear (2). Then tighten the set screw
(7).

1354B

Align the screw stop, and then tighten
the screw (12) so that there is no play
in the stepping work clamp driving
lever (9) and the set screw collar (10).
Check that the stepping work clamp
driving lever (9) turns smoothly.

1273B

Gently fit the rubber bushing (b) into the
stepping clamp lifter rod holders (15), and
then secure it with the two bolts (16).
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.

Ball bearings [2 pcs]
Work clamp cam gear
Work clamp fulcrum shaft
Retaining ring C
Plain washer
Screw
Set screw
Set screw
Stepping work clamp driving
lever
Set screw collar
Work clamp lever shaft
Set screw
Set screws [2 pcs]
Shoulder screw
Stepping clamp lifter rod
holders [2 pcs]
Bolts [2 pcs]

After installing
the
stepping
clamp lifter rod
holders (15),
check that the
stepping clamp
lifter (a) moves
smoothly.

1390B

1274B

(Continued on the next page.)

BAS-342G

58

6. ASSEMBLY

1275B

Index mark

1） With the screw stop of the pulse motor assembly P (17) facing
downward and the index mark on the work clamp driving gear (18)
facing to the right, adjust so that the clearance between the
pulse motor assembly P (17) and the work clamp driving gear (18)
is 6.2 mm, and then tighten the two set screws (19).

1276B

1277B

Index mark

2)
3)

59

Install the pulse motor assembly P (17) to the work
clamp motor plate (20) with the four bolts (21) so that the
motor connector is facing downward.
Align the index marks on the work clamp cam gear and
the work clamp driving gear, and then install the work
clamp motor plate (20) with the two bolts (22) so that
there is no backlash.

BAS-342G

17.
18.
19.
20.
21.
22.

Pulse motor assembly P
Work clamp driving gear
Set screws [2 pcs]
Work clamp motor plate
Bolts [4 pcs]
Bolts [2 pcs]

6. ASSEMBLY

6-5. Feed mechanism
6-5-1. Y-feed mechanism
Apply the grease  specified by Brother in the places indicated by

.

1. Y-pulley brackets [2 pcs]
2. Y-GT belts [2 pcs]
3. Pulley fulcrum shafts [2 pcs]
4. Pulley fulcrum shaft collars [2 pcs]
5. Pulley A assemblies [2 pcs]
6. Set screws [4 pcs]
7. Y-pulley bracket assemblies [2 pcs]
8. Bolts with washers [4 pcs]
(Temporarily tighten)

1278B

1279B

(Continued on the next page)
BAS-342G

60

6. ASSEMBLY

Align the reference line and the edge of the Y gear (13), and then tighten
the set screw. Push the pulley B assembly (11) and pulley B assembly
(16) against the ball bearings (a), tighten the set screw, and then move
the Y drive shaft (9) in the direction of the arrow and check that there is
no play.

Reference
line

Before inserting the Y drive shaft
(9), apply grease in the places
indicated by

.

1281B

Reference line

9.
10.
11.
12.
13.
14.
15.
16.
17.
18.

19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
Apply grease to the holes
and grooves of the Y
motor shaft.

1282B

61

BAS-342G

Y drive shaft
Y-GT belt
Pulley B assembly
Set screws [4 pcs]
Y gear
Set screws [4 pcs]
Y-GT belt
Pulley B assembly
Set screws [4 pcs]
Screws [2 pcs]

Y gear cover
Screws [3 pcs]
Y motor
Y motor gear
Set screws [3 pcs]
Y motor bracket
Bolts [4 pcs]
Bolts with washers [4 pcs]
(Temporarily tighten)
Fan
Screws [4 pcs]
Fan bracket
Bolts [2 pcs]

6. ASSEMBLY

Place the Y motor gear (22)
against ball bearing (b), and
then tighten the set screw (23).

1391B

Install the belt holder (31) so
that

the

side

with

the

countersunk hole is at the
top.

Countersunk
hole

1283B

Tighten the two bolts (M6X35) (33)
into the holes in the side of the bed,
and then pull the Y pulley bracket

31.
32.
33.
34.
35.
36.

Belt holders [2 pcs]
Bolts [8 pcs] (Temporarily tighten)
Bolts M6X35 [2 pcs] (Tighten and then pull.)
Bolts with washers [4 pcs] (Fully tighten)
Bolts [2 pcs] (Fully tighten)
Bolts M6X35 [2 pcs] (Remove)

assembly (c) to adjust the belt tension.

* After adjusting the belt tension, measure the tension. (Refer to the next page.)
(Continued on the next page.)
BAS-342G

62

6. ASSEMBLY

Microphone
position
(Lower belt)

Finger pressing
position
(Lower belt)

Microphone
position
(Lower belt)

Finger pressing
position
Middle of belt (Lower belt)

[Measurement position]

1284B
1285B


1. Move the Y arm (1) forward (in the direction of the arrow) as far as it will go.
2. Use a tension gauge (2) to measure the tension at the middle of the lower belt while referring to “Measurement position” in
the illustration.
* Check that the value for the belt tension is within the following value ranges.
[For a new belt: 650 to 750 N; For a reused belt: 520 to 600 N]
* Be sure to use a belt tension gauge to measure the belt tension, and measure from the middle of the lower belt.
* The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 50 mm and a span length of
333 mm.
* It is recommended that you use the Yunitta U-505 tension gauge.

63

BAS-342G

6. ASSEMBLY

37. Y motor assembly
38. Bolts [4 pcs]

Index mark
1286B

Adjust and install so
that the backlash is
within 0.01 to 0.05.

Move the feed plate in the Y direction so that the center of the feed
plate is aligned with the center of the needle hole, and then install the Y
motor so that the index mark on the end of the Y motor shaft is facing
directly upward.

Center of needle hole

Center

Y direction

1287B

BAS-342G

64

6. ASSEMBLY

6-5-2. X-feed mechanism
Apply the grease  specified by Brother in the place indicated by

.

1. X pulley bracket
2. X-GT belt
3. Pulley fulcrum shaft
4. Pulley fulcrum shaft collar
5. Pulley A assembly
6. Set screws [2 pcs]

Before inserting the X drive
shaft (7), apply grease in the

1288B

7.
8.
9.
10.
11.
12.
13.
14.
15.
16.

place indicated by

X drive shaft
Retaining ring
X-GT belt
Pulley B assembly
Set screws [4 pcs]
X gear
Set screws [4 pcs]
Retaining ring
X pulley bracket assembly
Bolts with washers [2 pcs]
(Temporarily tighten)

.

Reference
line
1289B

Align the reference line and the
edge of the X gear (12), and then
Reference
line

tighten the set screws (13).

Push the retaining ring (14) and the pulley
B assembly (10) against the ball bearings
(a), tighten the set screws (11), and then
move the X drive shaft (7) in the direction of
the arrow and check that there is no play.

1290B

65

BAS-342G

6. ASSEMBLY

1291B

Install the belt holder
(17) so that the side
with the countersunk
hole is at the top.

Countersunk
hole

Set the X linear guide (b) against
the X base plate (19) as shown in
the illustration, and then tighten
the bolts (20).

1355B

17. Belt holder
18. Bolts [4 pcs]
(Temporarily tighten)
19. X base plate
20. Bolts [16 pcs]

21. Y base plate tool
22. Bolts [2 pcs]
23. Bolts [16 pcs]

Edge

Install the Y base plate
tool (21) so that its edges
are positioned as shown
in the illustration.
1292B

Edge

Edge

* Once installation is complete, remove the Y base plate tool (21).
(Continued on the next page.)
BAS-342G

66

6. ASSEMBLY

Apply grease to the
places indicated by the
arrows.

Apply grease to the
holes and grooves of
the X motor shaft.

24.
25.
26.
27.
28.
29.
30.

Touch the X motor gear
(25) against the edge
of the ball bearing (c),
and then tighten the
two set screws (26).

X motor
X motor gear
Set screws [2 pcs]
X motor bracket
Bolts [4 pcs]
X motor assembly
Bolts [4 pcs]

1293B

Move the feed plate in the X direction so
that the center of the feed plate is aligned
with the center of the needle hole, and then
install the X motor so that the index mark
on the end of the X motor shaft is facing
directly downward.
Install the X motor assembly
(29) so that the projection is
touching against the bed.

Center of
needle hole

Center

X direction
1294B

Index mark

Adjust and install so that the backlash
is within 0.01 to 0.05.
1295B

67

BAS-342G

6. ASSEMBLY

31.
32.
33.
34.

Fan
Fan bracket
Screws [4 pcs]
Bolts [2 pcs]

1296B

1297B

35.
36.
37.
38.

Tighten the bolts (M6X30)
(35) into the holes in the
side of the bed, and then
pull the Y pulley bracket
assembly (d) to adjust the
belt tension.

Bolts M6X30 (Tighten and then pull)
Bolts [4 pcs] (Fully tighten)
Bolts with washers [2 pcs] (Fully tighten)
Bolts M6X30 (Remove)

* After adjusting the belt tension, measure the tension. (Refer to the next page.)
(Continued on the next page.)

BAS-342G

68

6. ASSEMBLY

Microphone
position
(Lower belt)

Finger pressing
position
(Lower belt)

Middle of
belt

[Measurement position]
1298B
1299B


1. Move the X base plate (1) to the left edge (in the direction of the arrow).
2. Use a tension gauge (2) to measure the tension at the middle of the lower belt while referring to “Measurement position” in
the illustration.
* Check that the value for the belt tension is within the following value ranges.
[For a new belt: 650 to 750 N; For a reused belt: 520 to 600 N]
* Be sure to use a belt tension gauge to measure the belt tension, and measure from the middle of the lower belt.
* The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 50 mm and a span length of 485
mm.
* It is recommended that you use the Yunitta U-505 tension gauge.

69

BAS-342G

6. ASSEMBLY

6-6. Feed covers
Install the cover rails so that the pins at the bottom
edges are on the outside.

Outside

Outside

Lock the projections together as shown in the illustration.

Place the middle cover on top of the cover rails
and outside cover on the bottom.

Align the
edges.

1352B

1301B
1353B

1. Fixations [2 pcs]
2. Screws [14 pcs]
3. Middle cover assemblies [2 pcs]
(Place into cover rail.)
4. Outside cover assemblies [2 pcs]
(Place into cover rail.)
5. Cover rail FR assemblies [2 pcs]
6. Bolts 4X10 [10 pcs]
7. Cover rail FL assemblies [2 pcs]
8. Bolts 4X10 [10 pcs]
9. Inside cover R assembly
10. Screws 4X8 [3 pcs]
11. Inside cover L assembly
12. Screws 4X8 [3 pcs]
13. Bellow assembly
14. Screws [4 pcs]
(Tighten the inside cover R assembly and
inside cover L assembly together.)

1300B

(Continued on the next page.)
BAS-342G

70

6. ASSEMBLY

Install the support plate bracket so that the notches are aligned with

1302B

the edge of the bed.

15. Auxiliary plate
16. Bolts with washers [14 pcs]

Support plate
bracket

Bed
1303B

After installing, check that the height of the needle plate is as
shown in the illustration.

Needle plate
1304B

71

BAS-342G

6. ASSEMBLY

6-7. Upper shaft mechanism
Before inserting the upper shaft (1), apply
the grease  specified by
.
Brother to the places indicated by

Apply adhesive  to the
outer circumference of the joint assembly
bearing.

1305B

Install the driving wheel B-winder so
that it is in phase with the thread
take-up crank and aligned with the
reference line on the upper shaft.

Reference line

5204Q

1） Tighten the screw of the thread take-up crank (5)
so that it is aligned with the upper shaft hole.
2） While pressing the thread take-up crank (5) so
that there is no play in it, tighten the two set
screws (8).
Apply adhesive  to the thread
section of the screw.

1.
2.
3.
4.

Upper shaft
Pulley gear R
Driving wheel B-winder
Stepping clamp cam
assembly
5. Thread take-up crank
6. Screw
7. Set screw
8. Set screws [2 pcs]
9. Set screws [2 pcs]
10. Rubber cap
11. Set screws [2 pcs]
12. Joint assembly
13. Set screws [2 pcs]

(Continued on the next page.)

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72

6. ASSEMBLY

Spring pin

Upper shaft

Pulley
bush

4644Q

1418B

Tighten the set screw so that the screw stop A on the
motor shaft is in the same phase as the screw stop B
on the thread trimmer cam.
Tighten the set screw so that the screw stop C on the
upper shaft is at a phase of approximately 180
degrees from the screw stop A on the motor shaft.

1） Set so that distance F is 4 mm and distance G is 1.5
mm, and then tighten the set screw (24).
2） Move pulley gear R (J) to the position where the teeth
of pulley gear L (H) and pulley gear R (J) are engaged
at a right angle, and then tighten the two set screws
(21).

Install the motor assembly so that the
harness is facing downward.

Adjust while referring to “6-9. Intermittent
presser foot lifter mechanism (2)”.
1306B

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

Thread trimmer cam
Motor assembly
Bolts [4 pcs]
Fries wheels [2 pcs]
Screws [3 pcs]
Set screws [2 pcs]
Set screws [2 pcs]
Set screws [2 pcs]
Set screws [2 pcs]
(Temporarily tighten)
23. Pulley assembly
24. Set screw

1） Align the index mark D on the thread trimmer cam
(14) and the index mark E on the joint assembly, and
then provisionally tighten the set screw at the index
mark side.
2） After tightening the set screw at the screw stop side,
fully tighten the set screw at the index mark side.
3） Carry out the adjustments in "7-16. Adjusting the
thread trimmer cam position".
Apply the grease  specified by Brother to
the groove.

1419B

73

BAS-342G

6. ASSEMBLY

6-8. Needle bar mechanism
Apply the grease  specified by Brother in the places indicated by

.

Set so that this hole faces vertically,
and then push in gently while
tightening the set screws (14) to
install.
Inside hole

5142Q

Left-hand thread

Fit the chamfering side of the
slide block into the groove on
the slide block guide.

After securing the needle bar, position
the slide block guide so that the machine
pulley turns smoothly, and then tighten
the bolts.

1. Slide block guide
2. Bolts [2 pcs]
(Temporarily tighten)
3. Washer
4. Thread take-up lever
assembly
5. Needle bearing
6. Needle bar crank
7. Set screws [2 pcs]
8. Set screw
9. Needle bearing

While gently pushing the needle bar
crank in the shaft direction, align the
set screw with the screw stop and then
tighten the set screw.

10.
11.
12.
13.
14.
15.
16.
17.

Needle bearing
Screw
Thread take-up support
Thread take-up support shaft assembly
Set screws [2 pcs]
Rubber caps [2 pcs]
Rubber cap
Slide block

(Continued on the next page.)
BAS-342G

74

6. ASSEMBLY

18. Needle bar clamp
19. Needle bar
(Insert from above)
20. Screw
21. Rubber cap

After inserting the needle

Inside hole

bar (19), apply grease in the
places indicated by

.

Cut section

Align the needle bar so that reference line A (the second lowest
reference line on the needle bar) or reference line a (top reference
line) is aligned with the lower edge of the needle bar bush when the
machine pulley is turned to lower the needle bar to its lowest
position, and then set the cut section so that it is facing forward and
tighten the screw.

4647Q

75

BAS-342G

1392B

Needle bar
bush

6. ASSEMBLY

6-9. Intermittent presser foot lifter mechanism (2)
1) With the needle bar lowered approximately 6.5 mm from

Install the presser bar spring collar as shown in the
illustration, and then adjust the height of the
presser adjusting screw to 32 mm.

its highest position, set the stepping clamp arm F to the
position of the straight line in the illustration.
Place a bushing in between stepping clamp arm F and
stepping clamp arm R so that there is no play, and then
tighten the bolt.

2)

5195Q

1393B

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

Stepping clamp arm F
Stepping clamp arm R
Set screws [2 pcs]
Bolt
Presser bar clamp
Presser bar
Bolt
(Temporarily tighten)
8. Stepping clamp lifter link
9. Washer

Notes on the installation position
(Refer to “7-13. Changing the
intermittent stroke”.)

10. Link shaft
(with retaining ring)
11. Set screw
12. Shoulder screw
13. Screw
14. Shoulder screw
15. Screw
16. Presser bar spring collar
17. Presser bar spring
18. Presser bar spring guide
19. Adjusting screw nut
20. Presser adjusting screw
21. Intermittent presser foot
22. Plain washers [2 pcs]
23. Finger guard
24. Screw
(Temporarily tighten)

1427B

Index marks

At the needle bar timing
*1)
position , align the index
marks of the stepping clamp
cam and the stepping clamp
connecting rod, and then
tighten the set screw (3).
*1)

:

Tighten the set screw on the screw stop
while lightly pressing the link shaft.

Position when the pulley is
turned to raise the needle
bar from its lowest position
until the reference line B (or
b) on the needle bar is
aligned with the lower edge
of the needle bar bush A

1428B

(Continued on the next page.)

1307B

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76

6. ASSEMBLY
After installing the needle plate while referring to “6-12. Thread trimmer mechanism (2)”, carry out the following adjustments.
5198Q

1395B

*1)

： Needle bar timing position
Position when the pulley is turned to
raise the needle bar from its lowest
position until the reference line B (or
b) on the needle bar is aligned with
the lower edge of the needle bar
bush A

1428B
1394B

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

77

Turn the work clamp cam gear (1) to move the stepping work clamp driving lever (2) to the solid line position shown in
the illustration.
Loosen the two nuts (4) and then turn the stepping rod joint (5) to adjust so that the height of the stepping clamp link (3)
is 93.5 mm from the bottom edge of the arm.
Set the height of the presser bar (6) to 41 mm above the needle plate, align the center of the intermittent presser foot (7)
and the needle hole, and then tighten the bolt (8).
Set the height of the intermittent presser foot (7) to 22 mm above the needle plate, and then tighten the screw (9).
Turn the work clamp cam gear (1) to move the stepping work clamp driving lever (2) to the dotted line position shown in
the illustration.
Set the needle bar to the timing position*1).
Loosen the nut (10) and turn the bolt (11) to set the height of the intermittent presser foot (7) to 0.5 mm above the needle
plate.

BAS-342G

6. ASSEMBLY

6-10. Lower shaft mechanism

Tighten the set screw (2) until the head
of the screw is flush with the edge of the
bed. (Refer to “7-8. Adjusting the rotary
hook lubrication amount”.)

1308B

1. Shuttle race base assembly
2. Set screw
3. Set screw
4. Adjusting stud

1309B

Adjust while referring to “7-19. Adjusting
the lower shaft gear backlash”.
Viewed from the front
5. Pinch sleeve A
6. Rock gear shaft
(Insert from the rear of the machine head)
7. Rock gear
8. Set screw collar B
9. Set screws [2 pcs]
10. Pinch sleeve B
11. Bolt (Temporarily tighten)
12. Set screw collar R
13. Set screw (Temporarily tighten)
14. Set screws [2 pcs] (Temporarily tighten)
(Continued on the next page.)

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78

6. ASSEMBLY

1310B

Push a screwdriver gently against the
stepped section of the lower shaft, and
then provisionally tighten the bolt.

Align the
lower shaft
bush (22)
with the edge
of the bed.
1311B

Mating Mark

Insert the crank rod [lower part] (28) into the crank of
the upper shaft, align the marks on the crank rod
(30) [upper part], and then gently tighten the two
bolts (31).
* Check that the pulley turns smoothly.

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

Set screw
Adjusting stud
Lower shaft M bush
Set screw
Set screw collar
Set screw collar
Lower shaft assembly
(Insert from the rear of the machine head)
Lower shaft bush
Set screw
Set screws [2 pcs]
Set screws [2 pcs]
Driver
Bolt (Temporarily tighten)
Crank rod [Lower part] (Insert into upper shaft crank)
Needle bearing
Crank rod [Upper part] (Align the mating mark)
Bolts [2 pcs]
Crank cover
Screws [3 pcs]

1312B

79

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6. ASSEMBLY

6-11. Shuttle hook mechanism

1313B
5149Q

1. Needle bar thread guide
2. Needle
3. Set screw
4. Shuttle hook
5. Shuttle race base
6. Shuttle race base setting
claw (Close)
7. Bobbin
8. Bobbin case

After installing the shuttle hook, carry out the adjustments in “7-4. Adjusting the
needle bar lift amount”, “7-5. Adjusting the driver” and “7-6. Adjusting the needle
clearance”.

6-12. Thread trimmer mechanism (2)
Apply the grease  specified by Brother in the places indicated by

.

5151Q

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

Fixed knife
Plain washers [2 pcs]
Screws [2 pcs]
Movable knife spacer
Movable knife assembly
Movable knife collar
Thrust washer
Movable knife
Shoulder screw
Needle plate
Screws [2 pcs]
Flat screws [2 pcs]

Movable knife
connecting plate
1314B

Insert the pin of the movable knife assembly into the
hole in the movable knife connecting plate, and then
install the needle plate with the screws and flat screws
so that the needle drops into the center of the needle
hole.

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6. ASSEMBLY

6-13. Work clamp arm mechanism

1349B

1. Feed plate
2. Bolts with washers [2 pcs]
3. Work clamp arm assembly
4. Bolts with washers [4 pcs]
5. Bolts [8 pcs]

After assembling, adjust the home position. (Refer to “7-20. Adjusting the home position”.) After that, carry out a test
feed to check that the needle hole does not go outside the frames of the work clamp and feed plate. If the needle
hole goes outside the frames, adjust the position of the feed plate or readjust the home position.

81

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6. ASSEMBLY

6-13-1. Adjusting the lift of the work clamp arm assembly

The highest
position

1315B


1. Loosen the four screws (1) on the outside at left and right.
2. Screw in the four M4 taps (2) on the left and right sides of the work clamp arm to apply pressure.
3. Adjust so that the sliding load of the cross rollers (3) is 10 to 40 N.
4. Tighten the four screws (1).

1. Loosen the two bolts (4) at left and right.
2. Lift up the left and right work clamp arm levers (5) by hand to their highest positions, and then tighten the two bolts (4).
3. Loosen the two nuts (7) at left and right.
4. Turn the shafts of the air cylinders (8) at left and right until the work clamp (6) is 30 mm above the top of the needle plate,
and then tighten the two nuts (7).

1. Loosen the four bolts (9).
2. Lower the work clamp (6), and then install the work clamp (10) with the four bolts (9).

1. Remove the four nuts (11).
2. Loosen the four nuts (12).
3. Tighten the four set screws (13) so that the pressure is uniform at the front and back of the work clamp (6), and then
tighten the four nuts (12). (Reference dimension: When the edge of the work clamp (6) is 26 mm above the top of the
needle plate)
4. Tighten the four nuts (11).

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6. ASSEMBLY

6-14. Thread wiper mechanism

Align the thread wiper shaft bracket
and the bottom of the arm and then
tighten the two bolts with washer.

5153Q

1. Thread wiper unit
2. Bolts with washers [2 pcs]
3. Bolt (Remove)
4. Plain washer (Remove)
5. Removed plain washer
6. Removed bolt
7. STOP switch harness
8. Thread wiper solenoid harness

Adjust the thread wiper after installing. (Refer to “7-11. Adjusting the thread wiper”.)

83

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6. ASSEMBLY

6-15. Covers

1316B

1. Shuttle race cover assembly
2. Face plate
3. Eye guard
4. Rear cover FL
5. Rear cover FR
6. Rear cover
7. X motor cover
8. Motor cover
9. Top cover

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84

7. ADJUSTMENT

7. ADJUSTMENT
CAUTION
Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.

Hold the machine head with both hands when tilting it
back or returning it to its original position.
In addition, do not subject the machine head to extra
force while it is tilted back. If this is not observed, the
machine head may become unbalanced and fall
down, and serious injury or damage to the sewing
machine may result.

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 before carrying out the following operations.
If the foot switch is depressed by mistake, the sewing
machine might start operating and injury could result.
• Inspection, adjustment and maintenance
• Replacing consumable parts such as the rotary
hook

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. If the oil
and grease get into your eyes or onto your skin,
inflammation can result.
Furthermore, do not drink or eat the lubricating oil or
grease. They may cause diarrhea or vomiting.
Keep the oil out of the reach of children.

Disconnect the air hoses from the air supply and wait
for the needle on the pressure gauge to drop to “0”
before carrying out inspection, adjustment and repair
of any parts which use the pneumatic equipment.

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.

If the power switch and air need to be left on when
carrying out some adjustment, be extremely careful
to observe all safety precautions.

7-1. Checking the safety switch
1. If the machine head is tilted back, gently return it to its
original position.
2. Turn on the power switch.
3. Check that no error numbers are displayed on the
operation panel.

< If error [E050], [E051] or [E055] is displayed >
If the safety switch (1) is not turned on, error [E050], [E051]
or [E055] will occur.
Check the installation position of the safety switch (1).
1) Turn off the power switch.
2) Loosen the two screws (2).
3) Push down the right side of the safety switch (1) so that
the safety switch (1) turns on, and then tighten the two
screws (2).
4) Turn on the power and check that no error numbers are
displayed.

3989M

85

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7. ADJUSTMENT

7-2. Standard thread tension
Upper thread

#20 or similar

Lower thread

#20 or similar

Upper thread tension (N)

1.4 − 1.8

Lower thread tension (N)

0.3 − 0.4

Thread take-up spring height
(mm)
Thread take-up spring
tension (N)

7 − 10
0.6 − 1.2

Pre-tension (N)

0.2 − 0.4

Needle

DP x 17 #19

7-2-1. Upper and lower thread tension

1378B

1377B

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86

7. ADJUSTMENT

7-2-2. Thread take-up spring

Lower

Higher

Loosen the set screw (1) and turn the adjuster to adjust.

4029M
4030M


1. Press the upper thread slightly above the tension
bracket (2) with a finger to stop the thread spooling out.
2. Pull the upper thread downward so that the thread
take-up spring (3) is extended to the same height as the
base of the thread guide arm (4), and then measure the
tension of the thread take-up spring (3).
3. Use a screwdriver to turn the tension stud (5) in order to
adjust the tension of the thread take-up spring (3).

Stronger

Weaker

NOTE:
If the thread tension spring (3) is not adjusted correctly, the upper thread trailing length will be uneven after thread
trimming.

7-2-3. Arm thread guide R

More
thread
More
thread

Less
thread
Less
thread

Index mark
Index mark

The standard position of arm thread guide R (1) is when the
screw (2) is aligned with the index mark.
Loosen the screw (2) and move arm thread guide R (1) to
adjust.
* When sewing heavy material, move arm thread guide R (1)
to the left. (The thread take-up amount will become greater.)
* When sewing light material, move arm thread guide R (1) to
the right. (The thread take-up amount will become less.)

4031M

87

BAS-342G

7. ADJUSTMENT

7-3. Adjusting the needle bar height

2552Q

4032M

Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug (2), loosen the screw (3)
and then move the needle bar up or down to adjust so that the second reference line from the bottom of the needle bar
(reference line A) is aligned with the lower edge of the needle bar bush (1).
* If using a DP X 5 needle, use the highest reference line (reference line a).

7-4. Adjusting the needle bar lift amount
Needle center

Rotary hook tip

2554Q

0135Q

4033M

Turn the machine pulley to raise the needle bar from the lowest position until the lowest reference line on the needle bar
(reference line B) is aligned with the lower edge of the needle bar bush (1), and then loosen the bolt (2) and move the driver
(3) so that the tip of the rotary hook is aligned with the center of the needle.
* If using a DP X 5 needle, use the second reference line from the top of the needle bar (reference line b).

7-5. Adjusting the driver
Needle center

Rotary hook tip

0135Q

2555Q

4034M

Turn the machine pulley to align the tip of the rotary hook with the center of the needle, and then loosen the set screw (2) and
turn the adjusting stud (3) to adjust so that the driver (1) is touching the needle.
NOTE:
If it crosses the needle more than necessary, it will place a load on the needle, or it may cause poor thread tension.
Furthermore, if it does not cross the needle at all, the tip of the rotary hook will interfere with the needle and skipped
stitches may occur.
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88

7. ADJUSTMENT

7-6. Adjusting the needle clearance

0.01 - 0.08mm

0138Q

4035M

Turn the machine pulley to align the tip of the rotary hook with the center of the needle, and then loosen the set screw (1) and
turn the adjusting stud (2) to adjust so that the clearance between the needle and the rotary hook is 0.01 − 0.08 mm.

7-7. Adjusting the shuttle race thread guide

3574Q

Install the shuttle race thread guide (1) by pushing it in the direction of the arrow so that the needle groove is aligned with the
center of the needle plate hole.
NOTE:
If the shuttle race thread guide (1) is in the wrong position, thread breakages, soiled thread or tangling of the thread may
occur.
The position of the shuttle race thread guide (1) is adjusted at the time of shipment from the factory. It should not be
changed if possible.

89

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7. ADJUSTMENT

7-8. Adjusting the rotary hook lubrication amount
More oil


The optimum position is when the head of the set screw (1)
is aligned with the edge of the bed. The rotary hook
lubrication amount can be adjusted within three turns to the
right from that position.

Less oil

• If the set screw (1) is turned clockwise, the lubrication
amount becomes smaller.
• If the set screw (1) is turned counterclockwise, the
lubrication amount becomes greater.
* If you would like the lubrication amount to be increased
further from the position the head of the set screw (1) is
aligned with the edge of the bed, use the following method
to make the adjustment.

Oil tube
More oil

Aligned
Three turns of the set
screw (1)

Less oil

4036M

4037M
4037M


1. Remove the four screws (1), and then remove the X motor
cover (2).

2. Tilt back the machine head.
3. Insert a screwdriver into the holes in the left side of the
sewing machine bed and loosen the two bolts (3).
4. Move the sub-tank (4) up or down to adjust its position,
and then tighten the two bolts (3).
• If the position of the sub-tank (4) is raised, the
lubrication amount will increase.
• If the position of the sub-tank (4) is lowered, the
lubrication amount will decrease.

More oil
Less oil

5. Return the machine head to its original position.
6. Install the X motor cover (2) with the four screws (1).

4038M

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90

7. ADJUSTMENT

7-9. Adjusting the position of the movable knife
4004M

5232Q 4039M



Reverse position
5233Q

5255Q

1. Open the top cover and tilt back the machine head.
2. Turn the pulley (1) by hand to lower the needle bar to its lowest position, and push the thread trimmer solenoid (2) as far
as it will go.
3. With the collar (3) inserted into the groove of the thread trimmer cam (4), turn the pulley (1) by hand to set the driving lever
(5) to the reverse position (when the thread take-up (6) is close to its lowest position).

4040M

4041M

4. Remove the rubber cap (7).
5. Loosen the bolt (8).
6. Move the movable knife connecting plate (10) back and forth to adjust so that the distance from the ridge on the right side
of the needle plate to the ridge on the movable knife (9) is 9.5 to 9.9 mm.
7. After tightening the bolt (8), check the above position once more.

91

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7. ADJUSTMENT

4004M

4042M

4043M

8. Turn the pulley (1) by hand to move the needle bar to its lowest position.
9. Loosen the nut (11), tighten the set screw (12) until the collar (3) is touching the inside of the groove in the thread
trimmer cam (4), and then turn it back in the counterclockwise direction by approximately 1/4 of a turn.
10. Tighten the nut (11), and then check that the collar (3) is not touching the inside of the groove in the thread trimmer cam
(4). In addition, push the driving lever (5) by hand toward the thread trimmer cam until the collar (3) touches the groove of
the thread trimmer cam (4), and then check that the driving lever (5) returns smoothly to its original position when it is
released.
11. Check that there is a gap of about 0 - 1 mm between the outside of the hole in the movable knife (9) and the ridge line on
the shuttle race thread guide (13) when there is still play between the parts.

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7. ADJUSTMENT

7-10. Replacing the movable and fixed knives

4044M

1. Loosen the two bolts (1) and then remove the feed plate (2).
2. Open the shuttle race cover, remove the two screws (3) and the two flat screws (4), and then remove the needle plate (5).
3. Remove the movable knife (6) and the fixed knife (7).

5003Q

4045M

4. Install the new fixed knife (7) in the position shown in the illustration.
5. Apply grease to the outside of the collar (8) and to the shoulder screw (9), and then install the new movable knife (6)
together with the thrust washer (10) and the movable knife spacer (11).
6. Check that the movable knife (6) and fixed knife (7) cut the thread cleanly. Replace the movable knife spacer with
accessory spacers (t=0.2, 0.3, 0.4) so that the knives trim the thread accurately.
* If the knife pressure is too weak and the thread is not completely cut, use a thinner movable knife spacer.
* If the knife pressure is too strong and the movable knife (1) turns stiffly, use a thicker movable knife spacer.
7. Apply grease to the pin (12), place it into the movable knife connecting plate (13), and install it to the needle plate (5).
8. Check that the needle is aligned with the center of the needle hole.
9. Install the feed plate (2). (Refer to the next page.)

93

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7. ADJUSTMENT

7-10-1. Installing the feed plate

index mark

4046M

NOTE:
Install the feed plate so that the surface with the index mark (U) is facing upward.
Place the rear edge of the feed plate (1) against the stepped part of base plate Y (2) (shaded section (A)) and use a 2 mm
diameter pin (such as a needle) to align the hole in the feed plate (1) with the hole in base plate Y (2); then tighten the two
bolts (3).

7-11. Adjusting the thread wiper

Approx. 2mm

5007Q

4047M

Approx. 3mm

4048M

1. Loosen the two screws (3) and shift the entire solenoid setting plate (4) up or down to adjust so that the thread wiper (2) is
15 mm in front of the needle center when the plunger (1) of the thread wiper solenoid is driven to the full stroke.
2. Loosen the screw (5) and adjust the position of the thread wiper (2) so that the distance from the thread wiper to the tip of
the needle is approximately 2 mm and the tip of the thread wiper (2) is approximately 3 mm from the center of the needle
when the thread wiper (2) passes below the needle during operation.
NOTE:
Check that the thread wiper (2) does not touch the finger guard (6).

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7. ADJUSTMENT

7-12. Presser foot installation position
Install the presser foot (1) with the screw (2) so that the
distance from the bottom of the presser foot to the top of the
needle plate is 22 mm when the sewing machine is stopped
and the presser foot (1) is raised.

5031Q

7-13. Changing the intermittent stroke
The intermittent stroke can be adjusted to within 2 − 10 mm by adjusting the position of the stepping clamp connecting rod
and changing the installation position of stepping clamp link A.



4049Q

1. Remove the face plate.
2. Remove the two screws (1) and the two shoulder screws (2), and then remove stepping clamp link A (3).
3. Change the installation position for stepping clamp link A (3) to either A, B or C above.
If the position of the stepping clamp connecting rod is adjusted as described in the following at any one of the installation
positions, the adjustment range for the intermittent stroke will as given in the following table. (Refer to the next page.)
Installation position

Intermittent stroke range

A

2 − 4.5mm

B

4.5 − 10mm

C

0 mm (Presser foot does not move up and down)
5012Q

95

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7. ADJUSTMENT


5014Q

Index mark

5015Q

4050M

1. Loosen the screw (1), and then open the cover (2).
2. Loosen the nut (3), and then adjust the position of the stepping clamp connecting rod (4).
• When the stepping clamp connecting rod (4) is raised, the intermittent stroke will increase.
• When the stepping clamp connecting rod (4) is lowered, the intermittent stroke will decrease.
Next, adjust the needle bar and presser foot timing.
3. Turn the machine pulley to raise the needle bar from the lowest position until the lowest reference line on the needle bar
(reference line B) is aligned with the lower edge of the needle bar bush (5).
(If using a DP x 5 needle, align with the second reference line from the top (reference line b).)
4. Open the top cover and loosen the two set screws (6).
5. Align the index marks on the stepping clamp cam (7) and the stepping clamp connecting rod (4), and then tighten the set
screws (6).

Check the following after changing the intermittent stroke.

5016Q

4051M

Needle plate

1. With the intermittent presser foot (1) lowered, turn the pulley to move the intermittent presser foot (1) to its lowest
position.
2. Check that the presser foot (1) does not touch the needle plate and that the presser bar clamp (2) does not touch the
presser bar bush (3).

Remove the motor cover (4).
Loosen the nut (5), and turn the bolt (6) until it is pressing against the intermittent drive lever (7), and then adjust until the
two points mentioned above are not touching.
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7-14. Adjusting the work clamp lift amount
The maximum lift amount for the work clamp (2) is 30 mm above the top of the needle plate.

Max. 30mm

5018Q

4052M

1. Turn on the air, and then turn on the power switch.
2. Depress the work clamp switch (1) to raise the work clamp (2).
3. Loosen the two bolts (4) of the work clamp lifter lever (3), and then move the work clamp lifter lever (3) up or down to adjust
the lift amount.

7-15. Adjusting the air pressure
Lift up the handle (2) of the regulator (1) and then turn it to
adjust the air pressure to 0.5 MPa.
After adjustment is complete, push the handle (2) downward
to lock it.

3975M

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7-16. Adjusting the thread trimmer cam position
1.
2.

Remove the top cover.
Loosen the two set screws (1), and then adjust the
position of the thread trimmer cam (3) so that the
distance between the edge of the collar shaft (2) and the
edge of the thread trimmer cam (3) is 0.2 - 0.5 mm. After
adjusting, tighten the two set screws (1).

4685Q

7-17. Belt tension adjustment


Finger pressing
position

Microphone
position
Middle of belt

[Measurement position]

1386B

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

Provisionally tighten the four bolts (1) and the two bolts (2).
Tighten the M6x30 bolt, and then pull the X pulley bracket (3) to adjust the tension.
Fully tighten the four bolts (1) of the X base plate (4) and the two bolts (2) of the X pulley bracket (3).
Remove the M6X30 bolt.
Move the X base plate (4) to the left edge.
Use a tension gauge to measure the tension at the middle of the lower belt while referring to “Measurement position” in
the illustration. (Refer to “6-5-2. X-feed mechanism” for details on measuring the tension.)
* Check that the value for the belt tension is within the following value ranges. If it is not within this range, repeat steps 2 to 6.
[For a new belt: 650 - 750 N; For a reused belt: 520 - 600 N]
* The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 50 mm and a span length of
485 mm.
* It is recommended that you use the Yunitta U-505 tension gauge.
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7. ADJUSTMENT


Microphone position

Finger
pressing
position

Microphone position

Finger
Middle of belt pressing
position

[Measurement position]
1387B

1.

Provisionally tighten the eight bolts (1) and the four bolts (2).

2.

Tighten the M6x30 bolt, and then pull the Y pulley bracket (3) to adjust the tension.

3.

Fully tighten the four bolts (2) of the Y pulley bracket (3).

4.

Fully tighten the eight bolts (1).

5.

Remove the M6X30 bolt.

6.

Move the Y arm (4) forward (in the direction of the arrow).

7.

Use a tension gauge to measure the tension at the middle of the lower belt while referring to “Measurement position” in
the illustration. (Refer to “6-5-1. Y-feed mechanism” for details on measuring the tension.)

* Check that the value for the belt tension is within the following value ranges. If it is not within this range, repeat steps 2 to 7.
[For a new belt: 650 - 750 N; For a reused belt: 520 - 600 N]
* The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 50 mm and a span length of
333 mm.
* It is recommended that you use the Yunitta U-505 tension gauge.

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7-18. Adjusting the tension release amount

5156Q

4689Q

1. Loosen the nut (4) and turn the bolt (2) to adjust so that the distance between the tip of the bolt (2) and the solenoid
setting plate (3) is 16.5 mm when the plunger of the tension release solenoid (1) is pushed in as far as it will go.
2. Check that the tension disc opening amount is 1.0 - 1.5 mm when the tension release solenoid (1) is installed to the arm
and the plunger is pushed with a screwdriver or similar tool through the hole in the solenoid cover.
*

If memory switch No. 552 has been set so that the tension release timing is early, you can increase the trailing length
for the upper thread.

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7. ADJUSTMENT

7-19. Adjusting the lower shaft gear backlash

1380B
1379B

1381B

1. Remove the two screws (1), and then remove the motor cover (2).
2. Remove the sixteen screws (3), and then remove the rear cover (4).
3. Remove the two screws (5), and then remove the Y motor fan (6).
4. Gently tilt back the machine head.

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1383B

1382B

5. Loosen the two set screws (7) and the bolt (8).
6. Push set screw collar R (9) against the edge of the bed, and then turn the pulley by hand and check that it turns smoothly.
* If the pulley cannot turn smoothly, loosen the set screw (10) and turn the pulley while moving the rock gear (11) back
and forth. At the position where the pulley moves smoothly, place set screw collar R (9) against the edge of the bed and
tighten the set screw (10).
7. Turn the rock gear shaft (12) to adjust the tip of the driver (13) so that there is 0.05 to 0.15 mm of play, and then tighten the
two set screws (7) and the bolt (8).

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7-20. Adjusting the home position
7-20-1. Presser foot lift home position
1 Turn the pulley to set the needle to the needle up stop position.
While pressing
2

the
keys simultaneously, turn on
the power switch.
* Keep pressing the
keys until the model name is
displayed and the buzzer beeps once.

TEST indicator and THREAD/CLAMP indicator illuminate.

3

• "orG" will flash in the PROGRAM No. display and the
offset value (default: 0) will be displayed in the menu
display.
5205Q 4443Q 4421Q

Press the RESET key.
• Intermittent presser foot home position detection will be carried out, and the intermittent
presser foot will stop at the currently-registered home position.
* If you press the RESET key for 2 seconds or more at this time, the offset value will be reset
to “
0 ”.

4

Remove the rear cover, align the index marks of the work
clamp cam gear (2) and the work clamp driving gear (3)
to the center line, and then press the
or
key to
change the offset value (-999 – 999).

Index marks

• The work clamp driving gear (3) will move in
5207Q 5208Q

conjunction with the setting value.

5

Press the RESET key.
• Intermittent presser foot home position detection will be
carried out. Check if the index marks are aligned with
the center line.

6
7

Repeat steps 4 and 5 until the index marks are aligned with the center line.
End adjustment mode.
Press the TEST key.
• The display will return to the normal display and the
sewing machine will switch to home position detection
standby.

TEST indicator switches off
NOTE:
Always be sure to press the RESET key and check that the index marks are aligned with the center line before ending
adjustment mode. If you end adjustment mode without checking the home position, error "E303" may be generated.

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7-20-2. X-Y feed home position
1
2

Turn the pulley to set the needle to the needle up stop position.
While pressing the
keys simultaneously, turn on
the power switch.
* Keep pressing the
keys until the model name is
displayed and the buzzer beeps once.

• "orG" will flash in the PROGRAM No. display and the
offset value (default: 0) will be displayed in the menu
display.
5205Q 4443Q 4421Q

TEST indicator and X-SCALE indicator illuminate.

3

Press the SELECT key so that either the X-SCALE
indicator or the Y-SCALE indicator illuminates.

4570Q

4

Press the RESET key.
• Home position detection will be carried out, and the work clamp will stop at the
currently-registered home position.
* If you press the RESET key for 2 seconds or more at this time, the offset value will be reset
to “
0 ”.
(Continued on the next page)

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7. ADJUSTMENT

5

1) Remove the feed plate.
2) Place the rear edge of the home position reference plate (1) against the stepped part of base plate Y (2) (shaded
section (A)) and use a 2 mm diameter pin (such as a needle) to align the hole in the home position reference plate
(1) with the hole in base plate Y (2); then tighten the two bolts (3).
3) Press the
or
key to change the offset value (-999 to 999) so that the needle drops to the center of the mark
(B) on the home position reference plate (1).
・ The home position reference plate (1) will move in accordance with the setting value.
Press the RESET key.
・ Home position detection will be carried out. Check the
home position. If the home position is correct, remove
the home position reference plate (1), and then install
the feed plate. (Refer to "7-10-1. Installing the feed
plate".)

6

7

Press the TEST key.
・ The display will return to the normal display and the
sewing machine will change to home position standby.

End adjustment mode.

TEST indicator switches off
NOTE:
Be sure to press the RESET key to check the home position before ending adjustment mode. If adjustment mode is ended
without checking the home position, error “E202” will be generated.

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7-21. Adjusting the needle up stop home position
NOTE:
If the four bolts (1) of the sewing machine motor and the
bolt (3) of the magnet are loosened, it may disrupt the feed
timing.
Do not loosen these bolts at the time of shipment from the
factory or after the needle up stop home position has been
adjusted.
1. Remove the needle and the needle bar thread guide.
2. Turn the pulley to move the needle bar (4) to its lowest
position.
3. Remove the rubber cap (5) from the face plate, and then
1421B

loosen the screw (6) of the needle bar clamp.
4. Adjust so that the lowest needle bar position is at the
distance h.
5. Tighten the screw (6) and then install the rubber cap (5).
6. While pressing the
*

key (7), turn on the power switch.

Keep pressing the

key (7) until the model name is

displayed and the buzzer beeps once.
7. Press the

key (7) or the

key (8) to select check

code “ 8”. (Refer to “2-7. Input checking method” for
details.
8. Remove the flywheels, and then loosen the bolt (3) of the
magnet (2) 1/4 of a turn.
9. Turn the pulley to lower the needle bar (4) to a distance H
from the highest position.
10. Move the magnet (2) to the precise point where the
1384B

menu display switches from “ on” to “ oFF”, and then
tighten the bolt (3).

Needle
plate

11. Turn the pulley to move the needle bar (4) to the position
of H and check that the menu display switches from “

Needle
Distance H
Distance h

DP x 17
55.5 mm
18.0 mm

DP x 5
50.4 mm
12.9 mm

on” to “ oFF”

1420B

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7-22. Adjusting the needle up stop position
Use the operation panel to adjust the needle up stop
position so that the needle bar (1) is lowered 6.2 - 6.7 mm
from its highest position (near the highest stop position for
the thread take-up).

5211Q

[Adjustment method]
and
keys simultaneously, turn
While pressing the
on the power switch.
* Keep pressing the
and
keys until the model
name is displayed and the buzzer beeps once.

1

・ “orG” will flash in the PROGRAM No. display, and the
home position offset value will appear in the menu
display.
4703Q 4448Q 4421Q

2

TEST indicator and SPEED indicator illuminate.
Lower the work clamp and then depress the start switch.
・ X-Y feed home position detection will be carried out, and then
“orG” will stop flashing and illuminate steadily.

Start switch

1385B

Depress the start switch once more.
・ The upper shaft will operate and the needle bar will stop at the
needle up stop position.

3

Start switch

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4

Press the
or
key to set the offset value (-9 to 10) so that the
needle up stop position is 6.2 to 6.7 mm below the highest position for
the needle bar (1).
・ When the
key is pressed, the needle bar will move down, and
when the
key is pressed, the needle bar will move up.
NOTE:
After changing the offset value, check that the thread trimming
operation is normal and that error [E110] is not generated.
5212Q

5

Lower the work clamp and then depress the start switch.
・ The upper shaft will operate and stop at the offset value which has
been set.
Start switch

6

1385B

End adjustment mode

Press the TEST key.
・ The changes to the offset value will be memorized and the sewing
machine will switch to home position detection standby.

TEST indicator switches off

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8. ELECTRICAL 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 cover of the control box. Touching areas where high voltages are present can result in severe
injury.

8-1. Precautions while carrying out adjustments
Be sure to note the following cautions when opening the control box to carry out inspections and adjustments.

Electric shocks
High voltages can remain in large-capacity capacitors for up to 5 minutes in some circumstances, even when the power has
been turned off. Accordingly, wait at least 5 minutes after turning off the power before carrying out the following operations.
•
•
•
•
•

Opening and closing the control box
Replacing fuses
Inserting and disconnecting connectors
Measuring resistance values
Any other tasks that may involve touching components inside the control box

Some inspection items require the control box to be open when the power is turned on and voltages are measured.
At such times, be extremely careful never to touch anywhere other than the specified locations. In addition, note that high
voltages may remain for up to 5 minutes after the power is turned off.
Injury
The fan inside the control box turns while the power is turned on, so be careful not to get anything caught in it.
Be careful not to touch metallic objects such as the heat sink and cover when connecting and disconnecting connectors and
making measurements.

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8-2. Inside the control box and operation panel structure
Main P.C. board
Secured to the side. This is the P.C. board that controls sewing machine operation.
PMD P.C. board
Secured to the base plate. This P.C. board drives the pulse motors and solenoids.
Power supply motor P.C. board
Secured to the rear. This P.C. board generates the voltages that are required for control, and drives the main shaft motor.
There are 8 fuses on this P.C. board.
DC fan motor
This fan cools the inside of the control box.
The filters at the air intake slots in the cover and base plate should be cleaned about once a month.
Conversion transformer
This breaks down the power supply voltage into the voltages that are required for control operations.
NF P.C. board
This eliminates the electrical interference that is generated by the power supply fan.
Panel P.C. board
Secured to the inside of the operation panel. This P.C. board is used for displaying the sewing machine status and for input
operations.

Control box

Operation panel

DC fan motor

Panel P.C. board

NF P.C. board
Power supply
motor P.C. board

Main P.C. board
Conversion
transformer

PMD P.C. board
5071Q

1407B

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8-3. Description of fuses
When replacing the fuses, be sure to use the fuses specified below.
If the components on the P.C. boards are damaged, the fuses may blow again soon even after they have been replaced.
No.
F1

Part name
Fuse 15AFB
(Glass tube fuse 15A-250V)

Parts code
SA3794-001

F2

Fuse 6AFB
(Glass tube fuse 6A-250V)

SA3759-001

F3

Fuse 6AFB
(Glass tube fuse 6A-250V)

SA3759-001

F4
F5
F6
F7
F8

Fuse 3AFB
(Glass tube fuse 3A-250V)
Fuse 3AFB
(Glass tube fuse 3A-250V)
Fuse 3AFB
(Glass tube fuse 3A-250V)
Fuse 15AFB
(Glass tube fuse 15A-250V)

616167-001
616167-001
616167-001
SA3794-001

Symptom when fuse blows
Sewing machine motor does not operate and
[E130] is displayed.
Feed mechanism does not operate and [E201] or
[E211] is displayed.
Intermittent presser foot does not operate and
[E300] is displayed.
Thread trimming solenoid or digital tension/tension
release solenoid does not operate, and thread
trimming or thread tightening problems occur.
Communication problem with PMD P.C. board and
[E403] is displayed.
Power indicator does not illuminate and nothing
operates.
DC fan motor does not operate and [E740] is
displayed.
Power indicator does not illuminate and nothing
operates.

Power supply motor P.C. board

4590Q

111

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8-4. Description of connectors
A large number of problems are often caused by connectors that are not inserted correctly or which are contacting poorly.
As a result, check that all connectors are inserted correctly and that the pins and wires are crimped properly before carrying
out problem diagnosis.

8-4-1. Connector positions
Main P.C. board

5072Q

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8. ELECTRICAL MECHANISM
PMD P.C. board

1260B

Power supply motor P.C. board

4593Q

113

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8. ELECTRICAL MECHANISM
Panel P.C. board

4594Q

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8. ELECTRICAL MECHANISM

8-4-2. Symptoms when there are poor connections
This divides the functions of the connectors into five sections, but some connectors have more than one function, so be sure
to refer to the trouble symptoms in other sections too.
Feed mechanism
Trouble symptom

Connector No. and position

• The feed mechanism operates briefly but does not detect
the home position correctly.
• [E200] (P20 X_ENC) or [E210] (P4 Y_ENC) is displayed.

5241Q

• Feed mechanism moves to the left and right briefly, and then
error [E210] appears.

4708Q

• Feed mechanism moves forward and back briefly, and then
error [E200] appears.

4709Q

• Feed mechanism does not move, and [E300] appears.

4710Q

Work clamp mechanism
Trouble symptom

Connector No. and position

• The work clamp pulse motor operates, but the home position
is not detected correctly.
• [E300] is displayed.

5242Q

• The work clamp pulse motor does not operate.
• [E300] is displayed.

4712Q

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8. ELECTRICAL MECHANISM

Thread trimming mechanism
Trouble symptom

Connector No. and position

• Thread trimming does not operate. (No error displayed)

4713Q

• Digital tension does not operate. (No error displayed)
[Digital tension specifications]

5243Q

• Analog tension does not operate. (No error displayed)
[Analog tension specifications]

4714Q

Sewing operations
Trouble symptom

Connector No. and position

• Power indicator does not illuminate and sewing machine
does not operate.
• Operation is unstable.

5244Q

• [E403] is displayed when the power is turned on and the
sewing machine does not start.

4717Q

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8. ELECTRICAL MECHANISM
Other
Trouble symptom

Connector No. and position

• The DC fan motor inside the control box does not operate.
• [E740] is displayed.

5245Q

• DC fan motor for X feed motor does not operate.
• [E741] is displayed.

1422B

• DC fan motor for Y feed motor does not operate.
• [E742] is displayed.

1423B

• Operation panel display is incorrect.
• Power indicator does not illuminate.
• Operation panel keys do not work.

5246Q

• Sewing machine does not start when foot switch is
depressed.
Work clamp is lowered when work clamp switch (left) is
depressed.
Home position is detected and sewing machine starts when
start switch (right) is depressed.

5247Q

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8. ELECTRICAL MECHANISM

• After the power is turned on, [E055] is displayed.

5248Q

• After the power is turned on, [E452] is displayed.

5249Q

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8. ELECTRICAL MECHANISM

8-5. Troubleshooting
8-5-1. Troubleshooting procedure
Carry out troubleshooting by following the procedure given below.

1 Checking connectors

With the power turned off, check that all connectors are securely inserted while
referring to “8-4. Description of connectors”.

2 Diagnosis flowchart

Carry out diagnosis while following the steps in “8-5-2. Diagnosis flowchart” on the next
page, and if a problem # is reached, continue to the next procedure.

3 Remedy

Refer to “8-5-3. Remedy” for the item that corresponds to the problem #. Carry out the
inspections for the problems in the order of the numbers in the “Cause” column.

NOTE:
When replacing the fuses, be sure to use a fuse with the same material and rating.

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8-5-2. Diagnosis flowchart
Description of symbols
Setting and status

Continued on
previous/next page

Switch operation

Judgment

OFF

Power switch OFF

“Problem” symbol in the “8-5-3. Remedy” lists

1429B

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1424B

121

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1425B

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8. ELECTRICAL MECHANISM

1426B

123

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8-5-3. Remedy
Problem

#1

The power indicator does not illuminate when the power is turned on.
Cause

1. Malfunction
harness ***

of

voltage

Inspection/Remedy/Adjustment
select

For 200 V specifications

a. Check if there is a broken wire in the voltage
select harness.
b. Disconnect the connector at the transformer
side, turn on the power and then measure the
voltage at the cord.
(The wiring position may vary depending on the
voltage specifications.)
OK if same as wall outlet voltage
Voltage
specifications
200V
H220V
380V
400V

Replacement if a
malfunction
Voltage select harness ***
(*** indicates voltage
specifications)

Pin No.
3-5
3-6
2-3
1-3

4876Q

2. Malfunction of transformer

1319B

1）OK if there is continuity between pins 1-3, 2-3,
3-4, 3-5, and 3-6 of the 6-pin connector
coming out from the transformer. [Fig. A]
2）OK if there is continuity between pins 1-2, 3-4
and 5-6 of the 6-pin connector coming out
from the transformer.
[Fig. B]
3）OK if there is continuity between pins 3-4 and
6-7 of the 7-pin connector coming out from the
transformer.
[Fig. C]

Transformer

1266B

1426B

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8. ELECTRICAL MECHANISM

Problem

#1

The power indicator does not illuminate when the power is turned on.
Cause

Inspection/Remedy/Adjustment

3. Malfunction of power cord

Replacement if a
malfunction

Disconnect connector P9 (ACIN) on the power
supply motor P.C. board from the circuit board,
turn on the power, and then measure the voltage
between pins 3-4 of the cord-side connector.
OK if same as wall outlet voltage
After inspecting, turn off the power and insert
connector P9.

4880Q

4. Blown fuse

5. Malfunction of power supply motor
P.C. board

Remove fuses F7 and F8 and check the continuity.
OK if continuity
(If there is no continuity, replace the fuse and then
carry out the inspections in 5. )
Disconnect connector P17 (M-MOTOR) of the
main P.C. board, turn on the power, and then
measure the voltages between the pins at the
cord-side connector.

Glass tube fuse
15A-250V
Power supply motor P.C.
board

OK if the voltages are as shown in the table below.
Pin Nos.
+ side
− side
1
3
2
4
6
5
7
5

Normal
voltage
+5V
+5V
+24V
+24V

After measuring, turn off the power, wait 5 minutes
or more and then insert P14.
5085Q

With connector P17 (M-MOTOR) inserted into the
main P.C. board, turn on the power and then
measure the voltages between the pins at the
cord-side connector.

6. Malfunction of main P.C. board

Main P.C. board

OK if the voltages are as shown in the table below.
Pin Nos.
Normal
voltage
+ side
− side
1
3
+5V
2
4
+5V
6
5
+24V
7
5
+24V

After measuring, turn off the power.
5085Q

7. Malfunction of panel P.C. board

125

Check that connector P1 (PANEL) is inserted into
the main P.C. board, and that connector CN2
(MAIN) is inserted into the panel P.C. board.

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Panel P.C. board
Panel harness

8. ELECTRICAL MECHANISM

Problem

#2

When the power is turned on, nothing is displayed in the PROGRAM No. display or the menu display.
Cause

Control program does not operate.

Problem

#3

Inspection/Remedy/Adjustment
Insert a CF card containing the control program,
turn on the power switch and update the program
version. (Refer to “3-11. Updating the control
program”.)

Replacement if a
malfunction
Main P.C. board

When the power is turned on, an error code is displayed.
Cause

1. If [E025] is displayed, the start
switch is still depressed.
If [E035] is displayed, the work
clamp switch is still depressed.
2. If [E055] is displayed, there is a
malfunction of the safety switch.

3. If [E065] is displayed, one of the
keys on the operation panel is still
depressed.
4. If [E403] is displayed, the
connection to the PMD P.C. board
is defective.
5. If [E401] is displayed, there is a
poor connection between the main
P.C. board and the power supply
motor P.C. board.
6. If [E450] or [E452] is displayed, the
machine head memory cannot be
verified.
7. If [E700] is displayed, there is an
abnormal rise in the power supply
voltage.
8. If [E705] is displayed, there is an
abnormal drop in the power supply
voltage.
9. If [E740] is displayed, there is a
malfunction of the cooling fan for
control box.
10.If [E741] is displayed, there is a
malfunction of the cooling fan for
the X motor.
If [E742] is displayed, there is a
malfunction of the cooling fan for
the Y motor.

Inspection/Remedy/Adjustment
1） Check if the start switch or the work clamp
switch is still depressed.
2） Check if there is a harness short-circuit.
3） Check that connector P6 (FOOT) is inserted
into the main P.C. board.
1） Check that the safety switch is OFF
2） Check if there is a harness short-circuit.
3） Check that connector P9 (HEAD-SW) is
inserted into the main P.C. board.
Check that connector P1 (PANEL) is inserted into
the main P.C. board, and that connector CN2
(MAIN) is inserted into the panel P.C. board.
1）Check that connector P1 (MAIN) is inserted
into the PMD P.C. board.
2）Check if there is a harness short-circuit.
1）Check that connector P6 (MAIN) is inserted
into the power supply motor P.C. board, and
that connector P17 (M-MOTOR) is inserted
into the main P.C. board.
2）Check if there is a harness short-circuit.
1）Check that connector P3 (HEAD-M) is
inserted into the power supply motor P.C.
board.
2） Check if there is a harness short-circuit.
1）Check that the power supply voltage at the wall
outlet is within the range of the specification
voltage +/- 10%.
2） Refer to check items #1-2 and #1-3.
1）Check that the power supply voltage at the
wall outlet is within the range of the
specification voltage +/- 10%.
2） Refer to check items #1-2 and #1-3.
1）Check if there are any thread scraps blocking
the cooling fan.
2）Check that connector P22 (FAN) is inserted
into the main P.C. board.
1） Check if there are any thread scraps blocking
the cooling fan.
2） Check that connector P10 (SENSOR2) is
inserted into the main P.C. board.

BAS-342G

Replacement if a
malfunction
Two-pedal foot switch

Safety switch

Panel P.C. board
Panel harness
Harness
Power supply motor P.C.
board
Main P.C. board
Main P.C. board

Machine head memory

Cooling fan
(for control box)
Cooling fan
(for X motor or Y motor)

126

8. ELECTRICAL MECHANISM

Problem

#4

Panel keys do not work.
Cause

Inspection/Remedy/Adjustment

Malfunction of panel P.C. board

Problem

#5

Check that connector P1 (PANEL) is inserted into
the main P.C. board, and that connector CN2
(MAIN) is inserted into the panel P.C. board.

Replacement if a
malfunction
Panel P.C. board
Panel harness

Home position detection is not carried out (nothing moves at all)
Cause

Inspection/Remedy/Adjustment

Malfunction of two-pedal foot switch

Disconnect connector P6 (FOOT) from the main
P.C. board, and check the continuity between
pins 5-6 and 7-8 at the cord-side connector.

Replacement if a
malfunction
Two-pedal foot switch

OK if normally ∞ Ω, and 0 Ω when the foot switch
is depressed.

Work Start
clamp

Problem

#6

1201B

Home position is incorrect.
Cause

Incorrect home position adjustment

127

Inspection/Remedy/Adjustment
Switch to adjustment mode and adjust the X and Y
feed home positions. (Refer to “7-20. Adjusting the
home position”.)

BAS-342G

Replacement if a
malfunction

8. ELECTRICAL MECHANISM

Problem

#7

An error code is displayed.
Cause

Inspection/Remedy/Adjustment

1. If the work clamp moves slightly in
the X feed direction and then
[E200] is displayed, there is a
malfunction of the encoder.
2. If the work clamp moves in the X
feed direction and then [E200] is
displayed, there is a malfunction of
the X home position sensor.

1）Check that connector P20 (X-ENC) is inserted
into the main P.C. board.
2）Check the encoder input while referring to
“2-7. Input checking method”.
1）Check that connector P10 (XPM) is inserted
into the PMD P.C. board, and that connector
P20 (X_ENC) is inserted into the main P.C.
board.
2）Check the X home position sensor input while
referring to “2-7. Input checking method”.
3）If a metallic object is brought close to the X
home position sensor and the LED inside the
sensor does not illuminate, there is a
malfunction of the sensor.
1）Disconnect connector P10 (XPM) from the
PMD P.C. board, and measure the resistance
between pins 1-2 and 3-4 at the cord-side
connector.
OK if 2−3 Ω
After measuring, insert P10.
2）If 1) is OK, there is a malfunction of the PMD
P.C. board.

3. If the work clamp does not move
and [E200] is displayed, there is a
malfunction of the pulse motor or
cord.

Replacement if a
malfunction
Pulse motor X assembly

X home position sensor

Pulse motor X assembly

PMD P.C. board

4885Q

Problem

#8

An error code is displayed.
Cause

Inspection/Remedy/Adjustment

1. If the work clamp moves slightly in
the Y feed direction and then
[E210] is displayed, there is a
malfunction of the encoder.
2. If the work clamp moves in the Y
feed direction and then [E210] is
displayed, there is a malfunction of
the Y home position sensor.

1）Check that connector P4 (Y-ENC) is inserted
into the main P.C. board.
2）Check the encoder input while referring to
“2-7. Input checking method”.
1）Check that connector P8 (YPM) is inserted
into the PMD P.C. board, and that connector
P4 (Y_ENC) is inserted into the main P.C.
board.
2）Check the Y home position sensor input while
referring to “2-7. Input checking method”.
3）If a metallic object is brought close to the Y
home position sensor and the LED inside the
sensor does not illuminate, there is a
malfunction of the sensor.

BAS-342G

Replacement if a
malfunction
Pulse motor Y assembly

Y home position sensor

128

8. ELECTRICAL MECHANISM

Problem

#8

An error code is displayed.
Cause

Inspection/Remedy/Adjustment

3. If the work clamp does not move
and [E210] is displayed, there is a
malfunction of the pulse motor or
cord.

1）Disconnect connector P8 (YPM) from the PMD
P.C. board, and measure the resistance
between pins 1-2 and 3-4 at the cord-side
connector.
OK if 2-3 Ω
After measuring, insert P8.
2）If 1) is OK, there is a malfunction of the PMD
P.C. board.

Replacement if a
malfunction
Pulse motor Y assembly

PMD P.C. board

4886Q

Problem

#9

An error code is displayed.
Cause

Inspection/Remedy/Adjustment

1. If the intermittent presser foot does
not operate and [E300] is
displayed, there is a blown fuse.

Remove fuse F2 from the power supply motor
P.C. board and check the continuity.
OK if continuity
(If there is no continuity, carry out the inspections
in 2.)
1）Disconnect connector P9 (POWER1) from the
PMD P.C. board and measure the resistance
between pins 1-2 at connector P9.
OK if ∞ Ω; if 0 Ω, there is a malfunction of the
PMD P.C. board.
2）Measure the resistance between the fuse F2
terminal that is close to P6 (MAIN) and pin 2
of connector P7 (PMD) on the power supply
motor P.C. board. (D10 check)
OK if ∞ Ω.
3）Disconnect connector P9 (POWER1) from the
PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +200 V
After measuring, turn off the power, wait 5
minutes or more and then insert P9.
4）Disconnect connector P2 (POWER2) from the
PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +16 V
After measuring, turn off the power, wait 5
minutes or more and then insert P2.
5）Check that connector P1 (MAIN) is inserted
into the PMD P.C. board.

2. If the intermittent presser foot does
not operate and [E300] is
displayed, there is a malfunction of
the PMD P.C. board or of the
power supply motor P.C. board.

1267B

129

BAS-342G

Replacement if a
malfunction
Fuse
6A-250V

PMD P.C. board or power
supply motor P.C. board

8. ELECTRICAL MECHANISM

Problem

#9

An error code is displayed.
Cause

Inspection/Remedy/Adjustment

3. If the intermittent presser foot
moves slightly and then [E300] is
displayed, there is a malfunction of
the encoder.
4. If the intermittent presser foot
operates and [E300] is displayed,
there is a malfunction of the work
clamp home position sensor.

1）Check that connector P5 (P-ENC) is inserted
into the main P.C. board.
2）Check the encoder input while referring to
“2-7. Input checking method”.
1）Check that connector P3 (PPM) is inserted
into the PMD P.C. board, and that connector
P5 (P_ENC) is inserted into the main P.C.
board.
2）Check the work clamp home position sensor
input while referring to “2-7. Input checking
method”.
3）If a metallic object is brought close to the work
clamp home position sensor and the LED
inside the sensor does not illuminate, there is
a malfunction of the sensor.
1）Disconnect connector P3 (PPM) from the PMD
P.C. board, and measure the resistance
between pins 1-2 and 3-4 at the cord-side
connector.
OK if 2-3 Ω
After measuring, insert P3.
2）If 1) is OK, there is a malfunction of the PMD
P.C. board.

5. If the intermittent presser foot does
not move and [E300] is displayed,
there is a malfunction of the pulse
motor or cord.

Problem

#10

1. Incorrectly inserted

2. CF card incorrectly formatted.
3. Malfunction of CF card

#11

Work clamp home position
sensor

Pulse motor P assembly

PMD P.C. board

CF media indicator does not illuminate.
Cause

Problem

Replacement if a
malfunction
Pulse motor P assembly

Inspection/Remedy/Adjustment

Replacement if a
malfunction

1）Check the insertion direction of the CF card.
(The side with the projection should be at the
left.)
2）Check the insertion of the CF card.
Check the format of the CF card.
(Format according to FAT16.)
Use a computer to check whether the contents of
the CF card can be read.

Work clamp does not rise.
Cause

1. Insufficient air pressure
2. Incorrect mechanism adjustment

Inspection/Remedy/Adjustment

Replacement if a
malfunction

Set to an appropriate pressure while referring to
“7-15. Adjusting the air pressure”.
Move the air valve manually and check that the
work clamp does not move stiffly.

BAS-342G

130

8. ELECTRICAL MECHANISM

Problem

#12

Work clamp does not drop.
Cause

1. Insufficient air pressure
2. Incorrect mechanism adjustment

Problem

1. Malfunction of panel P.C. board

2. Malfunction of main P.C. board

1. Malfunction of start switch or cord
2. Incorrect memory switch setting

#15

Check that connector P1 (PANEL) is inserted into
the main P.C. board, and that connector CN2
(MAIN) is inserted into the panel P.C. board.
Replace the main P.C. board.

Malfunction of work clamp switch or
cord

Main P.C. board

# 16

Replacement if a
malfunction

Inspection/Remedy/Adjustment
Refer to inspection #5.
1） Set memory switch No. 200 to OFF.
2） Set memory switch No. 252 to OFF.

Replacement if a
malfunction

Inspection/Remedy/Adjustment
Refer to inspection #5.

Sewing machine does not operate during sewing and an error code is displayed.
Cause

Inspection/Remedy/Adjustment

1. Malfunction of sewing machine
motor cord

Check connector P4 (UVW) of the power supply
motor P.C. board and the sewing machine motor
connector.
1）If the fuse (F1) is blown, check the resistance
values between all pins of the connector P4
(UVW) and the pins of the fuse (∞ Ω) and
replace the fuse.
2）If the fuse blows again, replace the power
supply motor P.C. board.
1）Turn off the power and let the sewing machine
stand for 30 minutes.
2）Turn the power back on; OK if operation is
normal.

2. If the fuse (F1) on the power supply
motor P.C. board is blown, there is
a malfunction of the main P.C.
board.
3. Sewing machine motor overheats
and the thermostat inside the motor
operates when the sewing machine
is operated at short cycle.

Avoid repeated sewing of sewing data that is less
than 15 stitches.

131

Replacement if a
malfunction
Panel P.C. board
Panel harness

Feed mechanism does not move fast during test feed.
Cause

Problem

Inspection/Remedy/Adjustment

#14 The feed mechanism does not move one stitch at a time during test feed.
Cause

Problem

Set to an appropriate pressure while referring to
“7-15. Adjusting the air pressure”.
Move the air valve manually and check that the
work clamp does not move stiffly.

#13 TEST indicator does not illuminate when the TEST key is pressed.
Cause

Problem

Replacement if a
malfunction

Inspection/Remedy/Adjustment

BAS-342G

Replacement if a
malfunction
Motor cable
Power supply motor P.C.
board

Motor cable

8. ELECTRICAL MECHANISM

Problem

#17

An error code is displayed after the sewing machine operates.
Cause

Inspection/Remedy/Adjustment

1. If [E120], [E121] or [E130] is
displayed after the sewing machine
operates, there is a malfunction of
the synchronizer, interference is
causing operating problems, or the
sewing machine is incorrectly
adjusted.

1）Check that connector P4 (UVW) is inserted
into the power supply motor P.C. board and
that the synchronizer is connected.
2）Check the synchronizer input while referring to
“2-7. Input checking method”.
OK if the signal turns on and off.
3）Turn the pulley by hand and check that it turns
smoothly.
4）Check that connector P17 (M_MOTOR) is
inserted into the main P.C. board and that
connector P6 (MAIN) is inserted into the
power supply motor P.C. board.
5）Check the harness between connector P17
(M_MOTOR) of the main P.C. board and
connector P6 (MAIN) of the power supply
motor P.C. board.
6）Check that the ground wire is connected to a
secure ground and that there is no equipment
nearby that is generating strong electrical
interference.
7）If [E121] is displayed when the sewing
machine stops:
• Check if the thread trimming solenoid is
operating.
• Adjust the thread trimming mechanism.
1）Turn off the power and let the sewing machine
stand for 30 minutes.
2）Turn the power back on; OK if operation is
normal.
3）If the area around the motor is not hot, carry
out the steps for [E121].

2. If [E150] is displayed after the
sewing machine operates, the
motor is abnormally overheating.

Replacement if a
malfunction
Motor assembly CCD-430D

Avoid repeated sewing of sewing data that is less
than 15 stitches.

Problem

#18

Sewing is incorrect.
Cause

Inspection/Remedy/Adjustment

1. Malfunction of synchronizer

Refer to inspection #17.

2. If uneven seams occur, there is a
malfunction of the pulse motor or
the mechanism is incorrectly
adjusted.

1）Refer to inspection #7-3 or #8-3.
2）If uneven seams occur because there is
insufficient air pressure for the work clamp,
adjust the work clamp pressure while referring
to “6-13-1. Adjusting the lift of the work clamp
arm assembly.”
3）If there is play in the feed mechanism, adjust
the feed mechanism.

BAS-342G

Replacement if a
malfunction

132

8. ELECTRICAL MECHANISM

Problem

#19 Thread is not trimmed.
Cause

Inspection/Remedy/Adjustment

1. Incorrect mechanism adjustment

2. Poor connector contact
3. Malfunction
solenoid

of

thread

trimming

Adjust the thread trimming mechanism while refer
to “7-16. Adjusting the thread trimmer cam
position”.
(If it is clear that the thread trimming mechanism
is not operating, carry out inspections 2. and 3.
below.)
Check that connector P1 (MAIN) is inserted into
the PMD P.C. board.
Disconnect connector P6 (SOL1) from the PMD
P.C. board, and measure the resistance between
pins 3-6 of the cord-side connector.
OK if 6 − 8 Ω

Replacement if a
malfunction

Thread trimming solenoid

4889Q

4. Malfunction of tension
solenoid/digital tension

release

Disconnect connector P7 (SOL2) from the PMD
P.C. board, and measure the resistance between
pins 1-2 of the cord-side connector.
OK if 6 − 8 Ω

Tension release solenoid/
digital tension solenoid

1）With connector P6 (SOL1) connected to the
PMD P.C. board, turn on the power and carry
out sewing, and measure the voltage between
pins 3-6 of connector P6 (SOL1).
OK if voltage is output momentarily at the
sewing end.
2）With connector P7 (SOL2) connected to the
PMD P.C. board, turn on the power and carry
out sewing, and measure the voltage between
pins 1-2 of connector P7 (SOL2).
OK if voltage is output momentarily at the
sewing end.

PMD P.C. board

4890Q

5. Malfunction of PMD P.C. board

4891Q

133

BAS-342G

8. ELECTRICAL MECHANISM

Problem

#20 Thread wiper does not operate.
Cause

Inspection/Remedy/Adjustment

1. Incorrect mechanism adjustment

2. Poor connector contact
3. Malfunction
solenoid

of

thread

wiper

Adjust the thread wiper while referring to “7-11.
Adjusting the thread wiper”.
(If it is clear that the thread wiper mechanism is not
operating, carry out inspections 2. and 3. below.)
Check that connector P1 (MAIN) is inserted into
the PMD P.C. board.
Disconnect connector P6 (SOL1) from the PMD
P.C. board, and measure the resistance between
pins 2-5 of the cord-side connector.
OK if approximately 4 Ω

Replacement if a
malfunction

Thread wiper solenoid

5088Q

4. Malfunction of PMD P.C. board

With connector P6 (SOL1) connected to the PMD
P.C. board, turn on the power and carry out
sewing, and measure the voltage between pins
2-5 of connector P6 (SOL1).
OK if voltage is output momentarily at the sewing
end.

PMD P.C. board

5089Q

Problem

#21

Needle does not stop in the up position ([E110] or [E111] is displayed.)
Cause

Inspection/Remedy/Adjustment

1. Incorrect adjustment

2. Malfunction of synchronizer
3. Malfunction of cord
4. Malfunction of power supply motor
P.C. board

Adjust while referring to “7-21. Adjusting the
needle up stop home position” and “7-22.
Adjusting the needle up stop position”.
Refer to inspection #17.
Refer to inspection #16.
With connector P2 (POWER2) connected to the
PMD P.C. board, measure the voltage at the cord.
OK if approximately 30 V DC between pins 3-4

Replacement if a
malfunction

Power supply motor P.C.
board

4892Q

5. Malfunction of main P.C. board
6. Malfunction of motor

Main P.C. board
Motor

BAS-342G

134

9. TABLE OF ERROR CODES

9. 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 cover of the control box. Touching areas where high voltages are present can result in severe
injury.
If a malfunction should occur with the sewing machine, a buzzer will sound and an error code will appear in the display
window. Follow the remedy procedure to eliminate the cause of the problem.

Switch-related errors
Cause and remedy
Code
E010
Stop switch was pressed. Press the RESET key to clear the error.
Stop switch was pressed. Press the RESET key to clear the error.
E011
Press the
key to move the work clamp so that you can continue sewing.
The stop switch was still being pressed, or there is a problem with the stop switch connection.
E015
Turn off the power, and then check that connector P13 on the main P.C. board is properly connected.
Problem with the stop switch connection.
E016
Turn off the power, and then check that connector P13 on the main P.C. board is properly connected.
The power was turned on while the start switch was still being depressed, or the start switch was depressed
without the work clamp being lowered.
If the power has been turned on while the start switch was still depressed, turn off the power and check the start
E025
switch.
If the start switch was depressed without lowering the work clamp, depress the work clamp switch to lower the
work clamp.
The work clamp switch is depressed.
E035
Turn off the power, and then check the work clamp switch.
A foot switch that does not match specifications is connected, or work clamp mode has not been set correctly.
E036
Use a foot switch that matches specifications, or initialize the memory switch settings.
Machine head tilting was detected after the power was turned on.
E050
Turn off the power, and then return the machine head to its original position.
Check that connector P9 on the main P.C. board is properly connected.
Machine head tilting was detected while the sewing machine was operating.
E051
Turn off the power, and then check that connector P9 on the main P.C. board is properly connected.
Machine head tilting was detected when the power was turned on.
E055
Turn off the power, and then return the machine head to its original position.
Check that connector P9 on the main P.C. board is properly connected.
An operation panel key was still being pressed when the power was turned on, or key is faulty.
E065
Turn off the power and check the operation panel.
Upper shaft motor-related errors
Cause and remedy
Code
Needle up stop position error.
E110
Turn the machine pulley until the point where the error display disappears.
Upper shaft did not stop at the needle up stop position when the sewing machine stopped.
E111
Turn the machine pulley until the point where the error display disappears.
Needle drop signal could not be detected.
E120
Turn off the power, and then check the synchronizer connection.
Thread trimming was not completed.
E121
Turn off the power, and then check if the cutting edges of the fixed knife and movable knife are damaged or worn.

135

BAS-342G

9. TABLE OF ERROR CODES
Code
E130

E131

E132

E133

E150

Cause and remedy
Sewing machine motor stopped due to a problem, or synchronizer is faulty.
Turn off the power, and then turn the machine pulley and check if the sewing machine has locked up.
Check that connectors P4 and P5 on the power supply motor P.C. board are properly connected.
Synchronizer is faulty.
Turn off the power, and then check that connector P5 on the power supply motor P. C. board is properly
connected.
Problem detected with sewing machine motor operation.
Turn off the power, and then check that connector P4 on the power supply motor P.C. board is properly
connected.
Sewing machine motor stopping position is incorrect.
Turn off the power, and then check that connector P5 on the power supply motor P.C. board is properly
connected.
Sewing machine motor is overheating, or temperature sensor is faulty.
Turn off the power, and then check the sewing machine motor.
(When sewing data with a small number of stitches (15 stitches or less) is sewn repeatedly (short cycle
operation), the upper shaft motor may overheat and the "E150" error code may be generated.)

Feed mechanism-related errors
Cause and remedy
Code
X-feed motor home position cannot be detected.
Problem with X -feed motor or poor X home position sensor connection.
E200
Turn off the power, and then check that connector P10 on the PMD P.C. board and connector P20 on the main
P.C. board are properly connected.
X-feed motor stopped due to a problem.
E201
Turn off the power, and then check if there are any problems in the X-feed direction.
Problem with X-feed motor or Y-feed motor home position adjustment data.
E202
Re-adjust the home position.
X feed motor stopped abnormally during sewing.
E204
Turn off the power, and then check if there are any problems in the X-feed direction.
X feed motor stopped abnormally while moving to the sewing start position.
E205
Turn off the power, and then check if there are any problems in the X-feed direction.
X feed motor stopped abnormally during test feeding.
E206
Turn off the power, and then check if there are any problems in the X-feed direction.
X feed motor stopped abnormally during programming.
E207
Turn off the power, and then check if there are any problems in the X-feed direction.
Y-feed motor home position cannot be detected.
Problem with Y-feed motor or poor Y home position sensor connection.
E210
Turn off the power, and then check that connector P8 on the PMD P.C. board and connector P4 on the main P.C.
board are properly connected.
Y-feed motor stopped due to a problem.
E211
Turn off the power, and then check if there are any problems in the Y-feed direction.
Y feed motor stopped abnormally during sewing.
E214
Turn off the power, and then check if there are any problems in the Y-feed direction.
Y feed motor stopped abnormally while moving to the sewing start position.
E215
Turn off the power, and then check if there are any problems in the Y-feed direction.
Y feed motor stopped abnormally during test feeding.
E216
Turn off the power, and then check if there are any problems in the Y-feed direction.
Y feed motor stopped abnormally during programming.
E217
Turn off the power, and then check if there are any problems in the Y-feed direction.

Work clamp-related errors
Cause and remedy
Code
Work clamp home position cannot be detected.
Problem with work clamp motor or poor work clamp home position sensor connection.
E300
Turn off the power, and then check that connector P3 on the PMD P.C. board and connector P5 on the main P.C.
board are properly connected.
Intermittent presser foot raised or lowered position cannot be detected.
E301
Turn off the power, and then check if there are any problems in the intermittent presser foot vertical direction.
Problem with work clamp motor home position adjustment data.
E303
Re-adjust the home position.

BAS-342G

136

9. TABLE OF ERROR CODES

Communication and memory-related errors
Cause and remedy
Code
Connection communication error with power supply motor P. C. board detected when power was turned on.
E401
Turn off the power, and then check that connector P6 on the power supply motor P.C. board and connector P17
on the main P.C. board are properly connected.
Communication error with programmer detected when power is turned on.
E402
Turn off the power, and then check that connector P7 on the main P.C. board is properly connected.
Connection error with PMD P. C. board detected when power was turned on.
E403
Turn off the power, and then check that connector P1 on the PMD P.C. board is properly connected.
Communication error with main P. C. board detected.
E410
Turn off the power, and then turn it back on again.
Communication error with power supply motor P. C. board detected.
E411
Turn off the power, and then turn it back on again.
Communication error with programmer detected.
E412
Turn off the power, and then turn it back on again.
Communication error with PMD P. C. board detected.
E413
Turn off the power, and then turn it back on again.
E420
No CF card is inserted.
Program contents are incorrect and cannot be used, or no data.
E421
Check that the CF card or floppy disk contains data with this program number.
Error occurred while reading the CF card or floppy disk.
E422
Check the data on the CF card or floppy disk.
Insufficient free space on the CF card, or data cannot be written to the floppy disk.
E424
Use a different CF card.
Check if the floppy disk is write-protected and if it has enough free space.
Error occurred while writing to the CF card or floppy disk.
E425
Use the specified type of CF card.
Check if the floppy disk is write-protected and if it has enough free space.
R/W key has not been pressed.
E426
Press the R/W key to load the data.
CF card or floppy disk does not contain any data with this program number.
E427
Check the program number.
Data that has already been loaded into internal memory can be used without having to press the R/W key again.
Data cannot be backed up to main P.C. board.
E430
Turn off the power, and then turn it back on again.
Data memory error on main P.C. board.
E440
Turn off the power, and then turn it back on again.
Model selection cannot be read from the machine head memory.
E450
Turn off the power and check that connector P3 on the power supply motor P.C. board is properly connected.
Data cannot be backed up to machine head memory.
E451
Turn off the power, and then turn it back on again.
Machine head memory is not connected.
E452
Turn off the power, and then check that connector P3 on the power supply motor P.C. board is properly
connected.
Internal memory is full and copying is not possible.
E474
Clear the sewing data.

137

BAS-342G

9. TABLE OF ERROR CODES

Data editing-related errors
Cause and remedy
Code
The enlargement ratio setting caused the sewing data to extend outside the sewing area.
E500
Set the enlargement ratio again.
Sewing data that exceeds the sewing machine's sewing area was loaded.
E501
Check the size of the sewing data.
The enlargement ratio caused the data pitch to exceed the maximum pitch of 12.7 mm.
E502
Set the enlargement ratio again.
Invalid code in sewing data.
E510
Reload the data from the CF card or floppy disk.
No end code has been input into sewing data.
E511
Input an end code, or change the program number.
E512
Number of stitches exceeds allowed maximum.
Extended option output number already exists. Change the extended option output number.
E520
If not using the extended option output, initialize the data to clear the extended option output data.
E530
Changing program number is prohibited.
Device-related errors
Cause and remedy
Code
Upper thread breakage occurred.
E600
Thread the upper thread. You can continue sewing.
P.C. board-related errors
Cause and remedy
Code
Abnormal rise in power supply voltage.
E700
Turn off the power and check the input voltage.
Abnormal rise in sewing machine motor drive voltage.
E701
Turn off the power, and then check the voltage.
Abnormal drop in power supply voltage.
E705
Turn off the power and check the input voltage.
Abnormal current detected in sewing machine motor.
E710
Turn off the power, and then check if there are any problems with the sewing machine.
Abnormal current detected in X-feed motor.
E711
Turn off the power, and then check if there are any problems in the X-feed direction.
Abnormal current detected in Y-feed motor.
E712
Turn off the power, and then check if there are any problems in the Y-feed direction.
Abnormal current detected in work clamp motor.
E713
Turn off the power, and then check if there are any problems with the X-feed mechanism, Y-feed mechanism or
work clamp lifter.
External error input (AIRSW) detected.
E730
Turn off the power, and then check the air pressure.
Control box cooling fan does not operate.
E740
Turn off the power, and then check if the cooling fan is blocked with scraps of thread.
Check that connector P22 on the main P.C. board is properly connected.
X-feed motor cooling fan does not operate.
E741
Turn off the power, and then check if the cooling fan is blocked with scraps of thread.
Check that connector P10 on the main P.C. board is properly connected.
Y-feed motor cooling fan does not operate.
E742
Turn off the power, and then check if the cooling fan is blocked with scraps of thread.
Check that connector P10 on the main P.C. board is properly connected.
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.

BAS-342G

138

10. TROUBLESHOOTING

10. 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.
If the foot switch is depressed by mistake, the sewing machine might start operating and injury could result.

Problem

Cause

Remedy

Work clamp moves stiffly.

Apply a suitable amount of grease to
the sliding parts of the work clamp
slider.

Air tube of presser lifter cylinder is bent
or damaged.

Straighten the bend in the tube or
replace the tube.

Work clamp lift amount is
incorrect.

Work clamp lifter lever position is
incorrect.

Adjust the position of the work clamp
lifter lever.

Work clamp does not lift
to the maximum height.

Cylinder joint position is incorrect.

Adjust the position of the cylinder joint.

Work clamp does not
lift.
Work clamp does not
drop.

Thread wiper does not
operate correctly.

Reference

P. 97

Adjust the height of the thread wiper.

P. 94

Adjust the stroke of the thread wiper.

P. 94

Thread wiper position is incorrect.

Adjust the stroke of the thread wiper.

P. 94

Lower thread winds to
one side.

Bobbin winder tension
height is incorrect.

Adjust the height of the bobbin winder
tension assembly.

Instruction
manual

Lower thread winding
amount is incorrect.

Bobbin presser position is incorrect.

Adjust the position of the bobbin
presser.

Instruction
manual

Thread slips out of the
needle.

Stitches being skipped at the sewing
start.

Refer to "Skipped stitches occur".

Upper thread trailing length is uneven.

Adjust the sub-tension.

Position of shuttle race thread guide is
incorrect

Adjust the position of the shuttle race
thread guide.

139

The thread wiper is obstructing the
needle.

assembly

BAS-342G

P. 140
Instruction
manual
P. 89

10. TROUBLESHOOTING

Problem
Upper thread breaks.

Lower thread breaks.

Skipped stitches occur.

Cause

Remedy

Reference

Upper thread tension is too strong.

Adjust the upper thread tension.

Instruction
manual

Needle is incorrectly installed.

Install the needle correctly.

Instruction
manual

Thread is too thick for the needle.

Select a thread that matches the
needle.

Instruction
manual

Thread take-up spring tension and
height are incorrect.

Adjust the tension and height of the
thread take-up spring.

P. 87

Damage or burring of the rotary hook,
needle hole plate or needle.

Repair or replace the problem part.

Thread breaking from heat (Synthetic
thread)

Use a cooling tank.

Instruction
manual

Thread is threaded incorrectly.

Thread the thread correctly.

Instruction
manual

Lower thread tension is too strong.

Adjust the lower thread tension.

Instruction
manual

Damage to corners of needle hole
plate or bobbin case.

Repair or replace the problem part.

Clearance between needle and rotary
hook tip is too great.

Adjust the needle clearance.

P. 89

Needle and rotary hook timing is
incorrect.

Adjust the needle bar lift amount.

P. 88

The driver is covering the needle more
than necessary.

Adjust the driver.

P. 88

Needle is bent.

Replace the needle.

Needle is incorrectly installed.

Install the needle correctly.

Needle is broken.

Instruction
manual

Adjust the needle clearance.

P. 89

Adjust the needle bar lift amount.

P. 88

Clearance between needle and rotary
hook tip is too great.

Thread jamming.

Needle is bent.

Replace the needle.

Needle deflection

Select a needle that is suitable for the
sewing conditions.
Reduce the sewing speed.

Instruction
manual

Needle is too thin.

Select a needle that is suitable for the
sewing conditions.

Instruction
manual

Thread take-up spring tension and
height are incorrect.

Adjust the tension and height of the
thread take-up spring.

P. 87

Needle and rotary hook timing is
incorrect.

Adjust the needle bar lift amount.

P. 88

Shuttle race thread guide is not
separating the threads.

Adjust the position of the shuttle race
thread guide.

P. 89

BAS-342G

140

10. TROUBLESHOOTING

Problem
Upper thread
trimmed.

Cause
is

not

Remedy

Movable knife is not cutting cleanly.

Replace with a new one.

P. 93

Fixed knife is not cutting cleanly.

Sharpen the fixed knife or replace it
with a new one.

P. 93

Adjust the position of the shuttle race
thread guide.

P. 89

Adjust the needle bar lift amount.

P. 88

Movable knife is not picking up the
upper thread because the last stitch is
being skipped.

Refer to "Skipped stitches occur".

P. 140

Movable knife position is incorrect.

Adjust the position of the movable
knife.

P. 91

Sub-tension is too weak.

Turn the sub-tension nut to adjust the
tension.

Instruction
manual

Shuttle race thread guide is not
separating the threads enough.

Adjust the position of the shuttle race
thread guide.

P. 89

Incorrect
thread

Adjust the upper thread tension.

Instruction
manual

Upper thread trailing length is uneven.

Adjust the sub-tension.

Instruction
manual

Upper thread tension is too weak.

Adjust the upper thread tension.

Instruction
manual

Lower thread tension is too weak.

Adjust the lower thread tension.

Instruction
manual

Thread take-up spring tension and
height are incorrect.

Adjust the tension and height of the
thread take-up spring.

P. 87

Position of arm thread guide R is
incorrect.

Adjust the position of arm thread guide
R.

P. 87

Thread take-up spring tension and
height are incorrect.

Adjust the tension and height of the
thread take-up spring.

P. 87

Sub-tension is too weak.

Turn the sub-tension nut to adjust the
tension.

Instruction
manual

Fixed knife is not cutting cleanly.

Sharpen the fixed knife or replace it
with a new one.

P. 93

Check if the safety switch cord is
disconnected.

Instruction
manual

Adjust the position of the safety
switch.

Instruction
manual

Movable knife is not picking up the
upper thread.

Poor stitch finish on
underside of material.

Incorrect tightening of
the thread

Upper thread trailing
length is uneven.

Sewing machine does
not operate when the
power is turned on and
the foot switch is
depressed.

tightening

of

the

upper

Safety switch does not work.

If the safety switch is malfunctioning,
replace it with a new one.

141

Reference

BAS-342G

11. 7 SEGMENT DISPLAY

11. 7-SEGMENT DISPLAY
０

１

２

３

４

５

６

７

８

９

Ａ

Ｂ

Ｃ

Ｄ

Ｅ

Ｆ

Ｇ

Ｈ

Ｉ

Ｊ

Ｋ

Ｌ

Ｍ

Ｎ

Ｏ

Ｐ

Ｑ

Ｒ

Ｓ

Ｔ

Ｕ

Ｖ

Ｗ

Ｘ

Ｙ

Ｚ

BAS-342G

142

SERVICE MANUAL

http://www.brother.com/
15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177
Printed in Japan

BAS-342G
I7070928B
2007.09. B (1)



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