VJW602CP'7_Allegro_COVER ABR521

User Manual: ABR521

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SERVICE MANUAL
MODEL : ABR521

VCR+DVD RECORDER
MODEL : ABR521

P/NO : 3829RGN004P

APRIL, 2005

SECTION 1
SUMMARY
CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-2
SERVICING PRECAUTIONS .................................................................................................. 1-3
THE STEPS FOR CHANGE THE OPTION CODE ........................................................... 1-4
UP-DATING PROGRAM ........................................................................................................... 1-5
SPECIFICATIONS ...................................................................................................................... 1-7

1-1

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE

A.C. Voltmeter

This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from ALLEGRO Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
0.15uF

Special components are also used to prevent x-radiation, shock and fire hazard. These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations
are allowed without prior approval by ALLEGRO Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes
into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or
user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
service literature.
The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.

Good Earth Ground
such as the Water
Pipe, Conduit, etc.

1500 OHM

Place this probe
on each exposed
metal part.

10 WATT

TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where
dew is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. A product mounted to a
shelf or platform must retain its original feet (or the equivalent thickness in
spacers) to provide adequate air flow across the bottom. Bolts or screws
used for fasteners must not touch any parts or wiring. Perform leakage tests
on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and
from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled
per the original design. Be sure that the safety purpose of the polarized line
plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor rated
at 1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all
exposed metallic parts of the cabinet (the channel selector knobs, antenna
terminals, handle and screws) to be sure that set is safe to operate without
danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per
volt or more sensitivity in the following manner: Connect a 1500 ohm, 10
watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a
known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

1-2

SERVICING PRECAUTIONS
CAUTION: Before servicing the VCR + DVD RECODER covered by this service data and its supplements and addends,
read and follow the SAFETY PRECAUTIONS. NOTE: if
unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.
Remember Safety First:

Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.

General Servicing Precautions
1. Always unplug the VCR + DVD RECODER AC power cord
from the AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an electrolytic capacitor.
Caution: A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which
should be removed for potential shock reasons prior to
applying power to the unit under test.

2. Do not spray chemicals on or near this VCR + DVD
RECODER or any of its assemblies.

3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.

3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.

4. Use only an anti-static solder removal device. Some
solder removal devices not classified as “anti-static” can
generate electrical charges sufficient to damage ES
devices.

4. Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5. Do not apply AC power to this VCR + DVD RECODER
and / or any of its electrical assemblies unless all solidstate device heat sinks are correctly installed.
6. Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V)
to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.

2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.

5. Do not use freon-propelled chemicals. These can
generate an electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
leads electrically shorted together by conductive foam,
aluminum foil,or comparable conductive material).

7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

1-3

THE STEPS FOR CHANGE THE OPTION CODE
Note : This procedure must be done when IC304(On digital Board) or Digital Boardassy
Push Switch POWER ON/ OFF
at remocon or timer keyborad

Select DVD MODE at the set
use remocon or timer keyborad

Push REC+ PLAY
at timer keyboard

Use remocon and push ENTER

DETECT NEW EEPROM (OPTION EDIT SCREEN)
ABR521
NAME
OPT1
OPT2
OPT3
OPT4
OPT5
OPT6
OPT7
OPT8

HEX
F2
55
53
55
17
B8
20
00

Press “Enter” key
to Save and Exit

Use Direction Key at
remocon (LEFT/ RIGHT)
for select the position of option

Use Direction Key
at remocon (UP/ DOWN)
for change the option

After finish edit code of option
push ENTER at remocon

For finishing and intialized
the option code push
REC + EJECT at remocon

1-4

UP-DATING PROGRAM
BURNING DISC
• For up-dating the DVD program using the disc, it must burning the disc which include the DVD software.
• For recorder combi set which using the disc downloader program are DVD Program and Loader Program.
• In 2nd generation for recorder combi can download the DVD program and Loader program one by one, or all
together.
Number 1

Number 2

* There is two way to format disc DVD Program
1. DVD and LOADER program format in one
disc
2. Only DVD program format in one disc

• If you format like number 1 you’ll see capture like (figure 1)
• And you have three choice:
1. Main. It’s mean if you chose this it’ll up-dating only DVD prgram.
2. Loader.It’s mean if you chose this it’ll up-dating only Loader program.
3. ALL. It’s mean if you chose this it’ll up-dating DVD and Loader program.

(Figure 1)

• If you format like number 2 you’ll not see capture like figure 1 that give you choices, you have no choice only
update DVD program

1-5

DVD UPGRADE INSTRUCTION
FORMAT NO 1
1. Press POWER KEY to turn on.
2. After booting, insert the upgrade disc, and you will see massage like [FIGURE 1]
3. Press “REC” key (front or remote) 3 times and you will see as [FIGURE 2] with remote Chose one of them
then Press enter
4. For update both of them [MAIN & LOADER] we chose “ALL” and first you will see [FIGURE 3] DVD update
→ Check the “Current Version” and “ New CD Write Version” and press “REC” key.
5. The DVD update will be on progress.And when finish update MAIN Version it’s automatically continue to
Update Loader Version and You will see [FIGURE 4]
→ Check the “Current Version” and “New CD Write Version “ and Press “REC” key once more
6. The LOADER update will be on progress. And tray will open.
7. Remove the disc and wait until finish
8. The tray will be close and open automatically after completing “UNDER UPDATE” 100%
9. Turn off the unit
10. Turn on again the unit is operation with new software

[FIGURE 1]

[FIGURE 2]

[FIGURE 3]

[FIGURE 4]

FORMAT NO 2
1. Press POWER KEY to turn on.
2. After booting, insert the upgrade disc, and you will see massage like [FIGURE 1]
3. Press “REC” key (front or remote) 3 times
4. The DVD update will be on progress.
→ Check the “Current Version” and “New CD Write Version “ and Press “REC” key once more
5. The tray will be open automatically after completing “UNDER UPDATE” 100%
6. Remove the disc andTurn off the unit
7. Turn on again the unit is operation with new software

[FIGURE 1]

[FIGURE 2]

1-6

SPECIFICATIONS
General
Power requirements
Power consumption
Dimensions (approx.)
Mass (approx.)
Operating temperature
Operating humidity
Television system
Recording format

AC 120V, 60 Hz
35W
430 X 78.5 X 354 mm (w x h x d)
5.7 kg
5°C to 35°C
5 % to 90 %
NTSC color system
NTSC

System
Laser
Video head system
Signal system

Semiconductor laser, wavelength 650 mm
Double azimuth 4 heads, helical scanning
NTSC

Recording
Recording format
Recordable discs
Recordable time
Video recording format
Sampling frequency
Compression format
Audio recording format
Sampling frequency
Compression format
Playback
Frequency response

Harmonic distortion
Dynamic range
Inputs
RF IN
VIDEO IN
AUDIO IN
DV IN
S-VIDEO IN

Outputs
S-VIDEO OUT
COMPONENT VIDEO OUT
Audio output (digital audio)
Audio output (analog audio)

DVD+RW/+R Video format
DVD-ReWritable, DVD-Recordable, DVD+ReWritable, DVD+Recordable
Approx. 1 hour (XP mode), 2 hours (SP mode), 4 hours (LP mode),
6 hours (EP mode)
27MHz
MPEG 2
48kHz
Dolby Digital

DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
DVD (PCM 96 kHz): 8 Hz to 44 kHz
Less than 0.008% (AUDIO OUT connector)
More than 95 dB (AUDIO OUT connector)

RF input, 75 ohms
1.0 Vp-p 75 ohms, sync negative, RCA jack
0 dBm more than 47 kohms, RCA jack (L, R)
4 pin (i.LINK/IEEE 1394 standard)
(Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω

(Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
(Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
0.5 V (p-p), 75 Ω, RCA jack x 1
2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1

* Design and specifications are subject to change without notice.
* Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic” and the double-D symbol are trademarks of
Dolby Laboratories.
* DTS and DTS Digital Out are registered trademarks of Digital Theater Systems, Inc.

1-7

SECTION 2
EXPLODED VIEWS
CONTENTS

EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Deck Mechanism Section (RL-05) ..........................................................................................2-3
3. Packing Accessory Section ....................................................................................................2-4

2-1

280

A44

A43

285

452

286

469

457

260

261

283
284

A50

2-2
261

264

266

274

320

A54

A60

263

468

A52

278

261

265

A48

457

469

465

A00

457

457

276

470

A47

469

469

323

463

321

256

255

257

469

A46

300

463

250

463

EXPLODED VIEWS

1. Cabinet and Main Frame Section

2. Deck Mechanism Section (RL-05)
A60
A001
1437

1001
1003

1002
A000

1434

1434

1030

1025
1029

1432 1027
1038 1029

1025
1027

1005

1432
1032
1026

1021 1432

1019

1433

1024

1033

1012

1435
1013
1014

1009

1016

1019

1015

1011
1020

1017

1436

A002

A004
1018A
1018

1006

1018B

1018C
1018E

1018D

1042

1432

1434
1041

2-3

1434

3. Packing Accessory Section
OPTIONAL PARTS

810 CABLE ASS'Y RF

806

808 BATTERY

CABLE(COAXIAL)

811

PLUG ASS'Y 1WAY

812

PLUG ASS'Y 2WAY

900 REMOCON

801 INSTRUCTION ASSEMBLY
826 FILTER
804 BAG
803 PACKING
803 PACKING

802 BOX CARTON

2-4

SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM ..............................3-2

VDR PART

VCR PART

VDR ELECTRICAL TROUBLESHOOTING
GUIDE ...........................................................................3-66
1. POWER(SMPS) CIRCUIT .....................................3-66
2. NO COMPONENT VIDEO SIGNAL WHEN
PLAYING DISC ......................................................3-68
3. NO COMPOSITE / S-VIDEO SIGNAL WHEN
PLAYING DISC ......................................................3-69
4. NO TV, EXTERNAL INPUT VIDEO SIGNAL.........3-70
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ......3-71
6. NO TUNER AUDIO OUTPUT ................................3-71
7. NO OPTICAL / DIGITAL OUTPUT ........................3-71
8. NO EXTERNAL INPUT 1, 2 AUDIO ......................3-72
9. NO EXTERNAL INPUT 3 AUDIO ..........................3-72

ELECTRICAL ADJUSTMENT
PROCEDURES............................................................3-3
VCR ELECTRICAL TROUBLESHOOTING
GUIDE .............................................................................3-4
1. POWER(SMPS) CIRCUIT .......................................3-4
2. SYSTEM/KEY CIRCUIT ..........................................3-7
3. SERVO CIRCUIT.....................................................3-8
4. Y/C CIRCUIT..........................................................3-11
5. HI-FI CIRCUIT .......................................................3-15
6. TUNER/IF CIRCUIT...............................................3-18

BLOCK DIAGRAMS ................................................3-73
1. VDR SET TOTAL BLOCK DIAGRAM ....................3-73
2. VDR MAIN H/ W BLOCK DIAGRAM.....................3-74
3. POWER BLOCK DIAGRAM ..................................3-75
4. AUDIO IN/ OUT BLOCK DIAGRAM ......................3-76
5. CPU & CONTROL REGISTER
BLOCK DIAGRAM.................................................3-77
6. VIDEO IN/ OUT BLOCK DIAGRAM ......................3-78
7. DV 1394 IN/OUT BLOCK DIAGRAM ....................3-79
8. MEMORY CARD IN/ OUT BLOCK DIAGRAM ......3-80

BLOCK DIAGRAMS ................................................3-20
1. POWER(SMPS) BLOCK DIAGRAM......................3-20
2. AVCP BLOCK DIAGRAM ......................................3-22
3. SYSTEM BLOCK DIAGRAM .................................3-24
4. JACK BLOCK DIAGRAM ......................................3-26
5. STUNER/MTZ BLOCK DIAGRAM.........................3-28
6. AVCP BLOCK DIAGRAM ......................................3-30

CIRCUIT DIAGRAMS..............................................3-32
1. POWER(SMPS) CIRCUIT DIAGRAM ...................3-32
2. TU/IF CIRCUIT DIAGRAM ....................................3-34
3. A/V CIRCUIT DIAGRAM........................................3-36
4. HI-FI CIRCUIT DIAGRAM .....................................3-38
5. SYSTEM CIRCUIT DIAGRAM...............................3-40
6. JACK CIRCUIT DIAGRAM ....................................3-42
7. TIMER CIRCUIT DIAGRAM( 2 TOOL ) .................3-44
8. TIMER CIRCUIT DIAGRAM( 3 TOOL, 8 TOOL ) ..3-46
9. TIMER CIRCUIT DIAGRAM( 4 TOOL ) .................3-48
10. TIMER CIRCUIT DIAGRAM( 6 TOOL ) ...............3-50
11. TIMER CIRCUIT DIAGRAM( 7 TOOL ) ...............5-52
• WAVEFORMS .........................................................3-54
• CIRCUIT VOLTAGE CHART ...................................3-56

CIRCUIT DIAGRAMS..............................................3-81
1. BGA 308P CIRCUIT DIAGRAM.............................3-81
2. DDR & B TO B CONNECTOR
CIRCUIT DIAGRAM ..............................................3-83
3. POWER, FLASH, CONNECTOR CIRCUIT
DIAGRAM ..............................................................3-85
4. RST, CONTROL/STATUS_REG., ATAPI,
HOST_CPLD, LATCH CIRCUIT DIAGRAM ..........3-87
5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM......3-89
6. DV1394, HDMI CIRCUIT DIAGRAM .....................3-91
7. AUDIO IN/OUT CIRCUIT DIAGRAM .....................3-93
• WAVEFORMS .........................................................3-95
• CIRCUIT VOLTAGE CHART ...................................3-97

PRINTED CIRCUIT DIAGRAMS .........................3-58
1. VCR P.C.BOARD...................................................3-58
2. SMPS P.C.BOARD ...............................................3-60
3. JACK P.C.BOARD ................................................3-62
4. KEY P.C.BOARD .................................................3-64
5. TIMER P.C.BOARD .............................................3-64

PRINTED CIRCUIT DIAGRAMS .........................3-99

3-1

1. VDR P.C.BOARD(TOP VIEW) ...............................3-99
2. VDR P.C.BOARD(BOTTOM VIEW).....................3-101

P3D02

A/E(-)
A/E(+)

P3D02

PMC01

CFG
CAP.VCC
SERVO VCC
CAP.REV'H'
I-LIMIT
MOTOR GND
S.GND
DRUM VCC(13.5VA)
CAP.CTL
L/M CTL
DPG/DFG
DRUM CTL

PMC01
P3D03

P3D03

P3D01

P3D01
1
2

8.7V
GND

1
2

P101

PPM01

P104

13.5VA(DRUM)

P104
P103

PN301

PMD02

PN304
CON401

CON401

R493

PMD01

1
1
SPD.F
2
2
GND
3
3
INTR/PROG
4
4
NC
5
5
GND
6
6
RADIO'H'
7
7
AMP ON
8
8
VDR REDET
9
9
NC
10
10
NC
11
11
NC
12
12
VDR CLK
13 DATA(VCR-VDR) 13
14 DATA(VDR-VCR) 14
15
15
VDR ENA
16
16
AMP CLK
17
17
AMP RX
18
18
AMP TX
19 AMP READY 19
20
20
AMP MUTE
21
21
NC

PN303

PM601

PM602

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

P6M01

PN301
PM603

3-2
P103
PN302
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

PN302

P6602

P6603

OVERALL WIRING DIAGRAMS

VCR PART
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
a) OSCILLOSCOPE : NTSC SP TEST TAPE

• Adjustment And Specification
MODE

MEASUREMENT POINT

ADJUSTMENT POINT

SPECIFICATION

PLAY

V.Out
H/SW(TP)

R/C TRK JIG KEY

6.5 ± 0.5H

• Adjustment Procedure
a) Insert the SP Test Tape and play.
b) Connect the CH1 of the oscilloscope to the H/SW and CH2 to the “VCR VIDEO” TP for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW, and then check the distance (time difference), which is from the selected A(B) Head point of the H/SW signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64µs).

• PG Adjustment Method
a-1) Playback the SP standard tape
b-2) Wait for 3seconds with F/P “REC” key and “PLAY” key presseed at the same time. < Digitron[ - - ] >
c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically. < Digitron[ PG ] >
d-4) Stop the playback, then it goes out of PG adjusting mode after mony the PG data.

• CONNECTION

OSCILLOSCOPE

TP
(VCR
VIDEO)
(CH2)

CH1 CH2

(CH1)

R/C KEY

H/SW
(TP)

H/SW "VCR VIDEO" TP
(TP)

VDR BOARD

VCR BOARD

• WAVEFORM

H/SW
6.5H(416µs)

Composite
VIDEO

3-3

VCR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT

Is the D127
normal?

NO 5.3VA.

NO

Replace the D127

YES

Is the F101 normal?

NO

Replace the F101
(Use the same Fuse)

Is the D128
normal?

YES

Is the BD101
Normal?

YES

NO

Power Line of Main
PCB(VCR) is short

Replace the BD101

YES

Is the TH01
Normal?

NO

Replace the TH01

YES

NO
Is the Vcc (14V - 17V)
supplied to IC101 Pin7?
YES

Is the D102
normal?
NO
Check or Replace
the D102

Is the D121
normal?

NO

Replace the D121

YES

Is there about 2.5V NO
at the IC103 Pin1?

Replace the IC103

YES

Is the D126
normal?

NO

Replace the D126

YES

Is the D129
normal?

NO

Replace the D129

YES

Is the D130
normal?

NO

Replace the D130

YES

3-4

NO

Replace the D128

VCR ELECTRICAL TROUBLESHOOTING GUIDE

(To Cap, Drum Motor )
No 12VA

Is the Vcc(13V)
supplied to C130?

No REG 12V

NO

NO
Is the Vcc(13V) supplied to Q126Collector?

Check or Replace
the D126

YES

Is the D132
Normal?

Check or Replace
the D126

YES

NO

Is the Vcc(33V) supplied to Q126 Base?

Replace the D132

YES

NO

Check the ‘PWR CTL
“H”’signal from µ-com

YES

Check or Replace
the Cap / Drum

Check the 33V Line

Is the Q126 Nomal?

NO

Replace the Q126

YES

Check or Replace
the D126

NO VFD

Is the R107
Normal?

No 33V

NO

NO
Is the Vcc(33V) supplied to Q123 Emittor?

Check or Replace
the R107

YES

Is the D128
Normal?

YES

NO

Check or Replace
the D128

Is the Q123 Base
‘H’?

YES

Is the ZD151
Normal?

Check or Replace
the D130

YES

NO

Check or Replace
the ZD151

Check or Replace
the Q123

YES

Check or Replace
the D127

3-5

NO

Check the ‘PWR CTL
“H”’signal from µ-com

VCR ELECTRICAL TROUBLESHOOTING GUIDE

No 28V (HSR)

Is the Vcc(30V) supplied NO
to Q120 Collector?

Check or Replace
the D129

YES

Is the Vcc(30V) sup- NO
plied to Q120 Base?

Check or Replace
the ZD153

YES

Is the Vcc(33V) supplied NO
to Q121 Collector?

Check the ‘HSR “H”
signal from µ-com

YES

Check or Replace the
Q121/Q122 & 33V line

Check or Replace
the Q120

3-6

VCR ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP

Auto Stop

Does the H/SW waveform
appear at IC501 Pin18?

NO

Check the Drum Motor
signal.

NO

Does 5.0V appear at the
RS501?

YES
Do the T-UP Reel Pulses
appear at IC501 Pin80?
YES

NO
Check the Power Circuit.

YES
Replace the T/UP Reel
Sensor (RS501).

Replace the IC501.

Note : Auto stop can occur because Grease or Oil has dried up

(2) The unstable loading of a Cassette tape
The unstable loading of a
Cassette tape

Is 12V applied to PMC01
Pin8?

NO

Check the power.

YES
Does the “H” signal appear
at IC501 Pin58 during
inserting the CST ?

NO

Is 5.0V applied to the
R531?
YES

YES
Does the “L” signal appear
at IC501 Pin10 while
inserting the CST?

Check the CST SW and
the peripheral circuitry.

NO

Refer to SMPS 5.3VA
troubleshooting.

NO
YES
Check IC501
Pins22, 23, 24, 25.

Check the Deck
Mechanism.
3-7

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Does the Noise level of the
screen change
periodically?

Do the CTL pulses appear
at IC501 Pin97?

NO

Is adjusting the height of
the CTL Head accurate?

NO

Readjust the height of the
CTL Head.

YES
Does the CFG waveform
appear at the IC501 pin87?

On tracking, do the CTL
pulses move?

NO

Replace the IC501.

YES
Does the Video Envelope NO
waveform appear at IC501
Pin9?
YES

Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.

Refer to “(2)
No 12VA of Power section”

Replace IC501.

(2) When the Drum Motor
(2) doesn’t run.

Do the Drum PWM Pulses
appear at IC501 Pin76?

When the Drum Motor
doesn’t run,

Does 12V appear at
PMC01 Pin8?

YES
Check the connector
(PMC01) and the Drum
Motor Ass’y.

YES

Do the DFG Pulses appear
at PMC01 Pin11?
NO

YES
Aren’t the foil patterns and
the Components between
IC501 Pin76 and PMC01
Pin12 shorted?

Replace the Cap M.

NO

YES
Does 2.8V appear at
PMC01 Pin12?

NO

Do the DFG Pulses appear
at IC501 Pin90?
NO

NO

YES
Do the Drum PWM Pulses
appear at IC501 Pin76?

NO

Aren’t the foil patterns and
the Components between
IC501 Pin 90 and PMC01
Pin11 shorted?
Replace the IC501.

YES
Are the connecting patterns and the Components
between IC501 Pin76 and PMC01 Pin12 shorted?

3-8

VCR ELECTRICAL TROUBLESHOOTING GUIDE
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,

When the Capstan Motor doesn’t run,

Does 12VA appear at PMC01?

NO

Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.

YES
Does 2.8V appear at PMC01 Pin9?
NO
YES
Check the PMC01 and the Capstan
Motor Ass’y.

Does the PWM signal appear at IC501
Pin77?
YES
NO

Aren’t the foil patterns and Components
between IC501 Pin77 and PMC01
Pin9 short?

Does the CFG signal appear at
PMC01 Pin1?
YES
NO

Does the CFG signal come into IC501
Pin87?

Check the Capstan Motor Ass’y.
NO

YES
Aren’t the foil patterns and component
between IC501 Pin87 and PMC01
Pin1 shorted?

Does the Capstan PWM signal appear at
IC501 Pin77?
NO
YES
Aren’t the foil patterns and Components
between IC501 Pin77 and PMC01
Pin9 short?

Replace the IC501.

3-9

VCR ELECTRICAL TROUBLESHOOTING GUIDE
2. SERVO CIRCUIT
(4) Keys do not work

Keys do not work

Is 5V applied to IC501
Pin99?

NO

Refer to “SMPS 5.3VA
Trouble Shooting”.

NO

Replace the defective
switches.

YES
Does FLD change when
a function button is
pressed?

3-10

VCR ELECTRICAL TROUBLESHOOTING GUIDE
4. Y/C CIRCUIT
(1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal
appear at IC301 Pin15?

NO

Check the Tuner Part

YES
Is REG 5.0V applied to
IC301Pins4, 22, 47, 50, 52,
60, 84, 92?

NO

Check the 5.0V, 5.3VA
Line. (Power Circuit)

YES
Does the Video signal
appear at IC301 Pin29?

NO

Is I2C BUS signal applied to NO
the IC301 Pins73, 74?

YES
Does the Video signal
appear at the PMD02
Pin7?

YES

NO

Check the Video Buffer
Q310, Q605.

NO

Check the DVD Board
Video path.

NO

Check PMD02 Pin5 and
IC601 Pin4

YES
Does the Video signal
appear at the IC601
Pin4?

Check C327. (AGC)
YES

YES
Does the Video signal
appear at the PMD02
Pin5?

Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)

YES
Replace IC601?

3-11

Replace IC301.

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.0V 5.3VA applied to IC301 NO
Pins22, 47, 50, 52, 60, 84, 92?

Check the line of the 5.0V
5.3V Line. (Power Circuit)

YES
Is I2C BUS signal applied to NO
the IC301 Pins73, 74?

Refer to ‘SYSTEM I2C
BUS CHECK Trouble
Shooting’.

YES
Does the normal RF signal
appear at IC301 Pin 76?

NO

Is the V.H.S/W signal
applied to IC301 Pin80?

NO

Check the System Circuit.
(IC501 Pin23)

NO

Check the V.H.S/W level.
(Check R342)

YES
Is the V.H.S/W “H” about
3.4V at the IC301 Pin80?
YES
YES

Clean the Drum.

Does the Y(Luminance)
RF signal appear at
IC301 Pin33?

NO

YES
Is the Y(Luminance) Video
waveform showed up at
IC301 Pin43?

NO

Check the path of the
Y(Luminace) RF signal.

YES
Replace IC301.

3-12

NO

Replace the IC301.

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5.0V 5.3VA applied to the IC301
Pins22, 47, 50, 52, 60, 84, 92.

NO

Check the line of the 5.0V
5.3VA Line. (Power Circuit)

YES
Does the Color signal
appear at IC301
Pin29?

YES

NO

Does the X301
(3.58MHz) osxillate?

NO

Does the Color signal
appear at IC301 Pin42?

NO

YES

Replace the IC301.

Replace the IC301.

3-13

Replace the X301.

Check the Color Pass.

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
NO
Check EE Mode.

Is the EE signal normal?
YES
Is 5.0V 5.3VA applied to
the IC301 Pins22, 47, 50,
52, 60, 84, 92?

NO

Check the line of the 5.0V
5.3VA line. (Power Circuit)

YES
Does PB Mode operate
nomally?

NO
Check PB Mode.

YES
Does the RF signal
appear at the IC301
Pin76?

NO

YES

Does the REC RF signal
appear at the IC301
Pins86, 90?

NO

Is the REC ‘H’ signal
(about 4V) applied to the
OSC?

NO

Check REC Luminace
pass & Color pass.

NO

Check the circuit of the
IC301 Pin86, 90.

YES

YES
Check the Drum & Drum
Connector

3-14

Check the System of REC
‘H’.(the IC501 Pin74)

Replace the IC301.

VCR ELECTRICAL TROUBLESHOOTING GUIDE
5. Hi-Fi CIRCUIT
(1) No Sound(EE Mode)
No Sound.
YES
Check the AV1 Audio of IC801
Pins9, 14.

NO

Check the AV2 Audio of IC801
Pins10, 15

NO

Check the DVD Audio of IC801
Pins2, 4.

NO

Check the 74 Audio of IC801
Pins48.

NO

Check the AV1 Jack.

Check the AV2 Jack.

Check the DVD Audio out.

Check the Tuner Part

YES
Check the Vcc of IC801 Pins25, 40, 51,
58.

NO

Check the Power 5.0V, 12V.

YES
Check the IIC Clock and DATA at
IC801 Pins42, 43.

NO
Check the IC501 Pins71, 72.

YES
NO
Check the Audio of IC801 Pins53, 57.

Replace IC801.

YES
NO
Check the Audio of PMD02 Pin19, 21.

Check the Pcb Pattern between IC801
Pin53, 57 with PMD02 Pin19, 21.

YES
NO
Check the Audio of PMD02 Pin23, 25.

Check the DVD Board Audio path.

YES
Check the SC901, JK601.

3-15

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(2) Hi-Fi Playback
PB mode
YES
No Sound.
YES
Check the Vcc of IC801
(Pins25, 40, 51, 58)
YES

NO

NO
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
YES
Is the RF Envelope at IC801
Pin30 over 300mVp-p?
YES

NO

Check Power 5.0V, 12V.

Check IC501 Pin27
(A.H/SW)

NO
Is Pin29 of IC801 over
3.5V
NO
Check Rec ‘H’ signal of
µ-com.

Check IC801 Pin42(Data),
Pin43(Clock)
YES

NO

NO
Do Audio Signals appear at
IC801 Pin22(L-CH), 24(R-CH)?
YES
NO
Do Audio Signals appear at
IC802 Pin53(L-CH), 57(R-CH)?
YES
Check the Audio of
PMD02 Pins19, 21
YES

NO

Check the Audio of
PMD02 Pins23, 25
YES

NO

Is the head Switching signal
IC801 Pin27 ok?

Check the parts of µ-COM
(IC501 Pins17, 18)

Check the Connection at
P3D01 Pins7, 9.

Replace IC801.

Check the PCB pattern between IC801
Pins3, 5, 7 with PMD02 Pins19, 21

Check the DVD Board
Audio Part

Check the JK601

3-16

YES

Is the head Switching signal
IC801 Pin27 ok?
YES

VCR ELECTRICAL TROUBLESHOOTING GUIDE

(3)
Hi-Fi REC.
YES
It can’t be recorded Hi-Fi Audio
signal.
YES
Check Vcc of IC801. (Pins25, 40, 51, 58)

NO

Check Power 5V, 12V.

YES
Check IC801 Pin42(Data), Pin43(CLOCK).

NO

Check ports of µ-COM.
(IC501 pins 71, 72)

YES
Do Audio signals appear at IC801
Pins53, 57?

NO

Check Audio input signal of IC801
Pins2, 4, 9, 10, 14, 15, 48.

YES
Do FM Audio signals appear at IC801
Pin36?

NO

YES
Check the Contact Point of Drum
Connector if good then Replace the Drum.

3-17

Replace IC801.

VCR ELECTRICAL TROUBLESHOOTING GUIDE
7. Tuner/IF CIRCUIT
(A)

No Video on TV screen.
YES
Is Tuner mode selected?

NO

changer to Tuner mode using remocon.

YES
Is “TV” displayed on FLD displayed

YES

Set TV/VCR SW to VCR using remocon.

NO
Is +5V applied to TU701 Pin 3?

NO

Check 5V Line.

YES
Is “High” applied to TU701 Pin 4?

NO

Check the voltage at Pin26 of IC501.
(“H” for tuner mode)

NO

Check the path form Pin23 of IC601
to the Pin 5 of TU701.

YES
Does the Video signal appear at Pin 16
of TU701?
YES
Replace TU701

3-18

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B)

No TV sound.
YES
Check the Vcc of IC801(Pin58).

NO

Check Power (Vcc 12V)

YES
Check IC801 Pin 43(DATA),
Pin 42(CLOCK) “HIGH”?

YES

Check IC501 Pin 71(CLOCK),
Pin 72(DATA)

NO
Check IC801 Pin 48(TUNER SIF).

NO

YES
Replace IC801.

3-19

Check TU701 Pin 13
(TUNER Audio Output)

BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM

!

TH01

BD101

+
C103

!

RECTIFIER &
SMOOTING BLOCK
(D128,C133,R130)

T101

RECTIFIER &
SMOOTING BLOCK
(D126,C136,L122,C130)

SNUBBER
BLOCK
(D101,C105
C106,R103)

RECTIFIER &
SMOOTING BLOCK
(D129,C128,R147)
RECTIFIER &
SMOOTING BLOCK
(D130,C137,R146)

DRIVE & S/W BLOCK
(IC101, D102, R105,
C108,C112,C120,
ZD101)

NOISE FILTER
BLOCK
(C101,L102,
L101, C102)

S/W Block
(Q111)

!

PHOTO COUPLER
(IC107)

RECTIFIER &
SMOOTING BLOCK
(D121,C122,L121,C124)

!

FUSE
(F101)

!

FEED-BACK
PHOTO COUPLER
BLOCK
(IC102)
R121,R122,
C121,R123.
ERROR AMP
R124.R125
(IC103)
R126)
T102

SNUBBER
BLOCK
(D103,C115,C116
,R112,R115)

RECTIFIER &
SMOOTING BLOCK
(D125,C139,L127,C140)
RECTIFIER &
SMOOTING BLOCK
(D124,C129)

!
DRIVE & S/W BLOCK
(IC104, D104, R113,
C117,C114,C119,
ZD102)

Y-CAP
C110

RECTIFIER &
SMOOTING BLOCK
(D123,C126,L124,C127)
RECTIFIER &
SMOOTING BLOCK
(D122,C123,L123,C125)

BR BL
(BK)(WH)

!
!

Y-CAP
C111

FEED-BACK
BLOCK
R131,R132,
C141,R133.
ERROR AMP
R161.R162
(IC106)
R163)

RECTIFIER &
SMOOTING BLOCK
(D127,C131,L125,C132)
HSR S/W Block
(Q120,ZD153,C135,
R144,R145,D155,C157)
12V REG & S/W Block
(Q126,R150,ZD152,
C156,C153)
33V S/W Block
(Q123,R143,R134)
5.0V S/W Block
(Q124,R140,R135,R136
D134,C134)
HSR CTL Block
(Q121,Q122,R141)
PWR CTL Block
(Q125,R137,R138)

12V REG & S/W Block
(IC157,R156,C155)

3-21

5.3VA
5.0V
Cap Vcc
REG 12V
33V
12VA(DRUM)
PWR CTL 'H'

HSR 'H'
DVD PWR CTL

FD(-)
FD(+)
-28VA
TO FAN
(P104)

8.7V
TO VDR
(P102)

-12V
12V

5.0V REG & S/W Block
(IC151,R151,C151)
1.8V REG & S/W Block
(IC160,R159,C152,
R167,R168)
3.3V REG & S/W Block
(IC154,R154,C154)

PHOTO COUPLER
(IC105)

3-20

TO VCR
(P101)

2.5V REG & S/W Block
(IC152,R169,C150)

1.8V
2.5V
3.3V
5.0V

TO LOADER
(P103)

12V
5.0V

D-V SYNC

V. OUT

EP CH1

EP CH2

SP CH1

SP CH2

28

29

11

49

53

55

V.ENV
(TO u-COM)

Y-CCD

17

15

+

ATT
-10dB

+

19

ATT
-10dB

+

18

FBC
Video ALC

CLEAR
SYNC

VIDEO
AGC

78

36

TRAP

2M LPF

Y-LPF

LPF

18

38

37

CLAMP

SPF

51

Main
Conv2

Main
Conv2

36

CLAMP

YNR

C-LPF

SYNC
SEP

65

32

CCD
LPF

57

FBC
ALC

30

8

9

45

Y LPF

9

8

Main
Emph

L-DET

Main
Conv2

11

26

74

LPF

MIX
ATT

HPF

REC
Trap

68

LPF

TRAP

LPF

40

NC

X-tal
VCO/OSC

67

38

C.K

VCA

36

Sharpness
CONTROL

SYNC SEP

APC/ACC
DET

YNR

BD

f0=1.68M

37

CLAMP

CLAMP

BPF

Serial Cont
interface

73

f/0DEV
Adjst

FM
MOD

B.E
C.K

65

23

NL
De-eMPH

Main
Conv1

L- DET

CCD LPF

Main
De-Empf

VCA

57

DEMO
S LPF

C-LPF

VCD
(-4dB)

45

D LIM

DEALY

NL Emph

C LPF

Serial Cont
interface

73

System
DATA
(FROM u-COM)
74

System
CLOCK
(FROM u-COM)

G.EQ

D.E.

HIFI Trap

fh Trap

CTL Trap

FM AGC P.EQ

ACC

APC/ACC
DET

AGC DET

ACC

40

71

X-tal
VCO/OSC

68

IC301
HA118725NF

SQUEL CH

CLOCK Drive

C-CCD

46

ATT
-10dB

+

79

IC301
HA118725NF

REC-AMP
EP CH1

REC-AMP
EP CH2

REC-AMP
SP CH1

REC-AMP
SP CH2

6dB
AMP

91

90

89

87

86

85

83

80

System

System V.H/SW30
(FROM u-COM)

+
+
TV
VIDEO IN

91

90

89

87

86

85

30

D-V SYNC
System
(FROM u-COM)

V. OUT

EP CH1

EP CH2

SP CH1

SP CH2

System V.H/SW30
(FROM u-COM)

2HD Model Only
4HD/4HD Hi-Fi Model Only

REC-AMP
EP CH1

REC-AMP
EP CH2

REC-AMP
SP CH1

REC-AMP
SP CH2

80

FBC
Video ALC

50

28

SQUEL CH

CLEAR
SYNC

29

MIX
AMP

51

49

53

Y-CCD

55

C-CCD

46

CLOCK Drive

+

DVD

System

3-23
CLOCK
(FROM u-COM)

3-22
DATA
(FROM u-COM)

1) PB Mode

S/W
VIDEO IN

+

2HD Model Only
4HD/4HD Hi-Fi Model Only

2. AVCP BLOCK DIAGRAM
2) REC Mode

3. SYSTEM BLOCK DIAGRAM
TO/FROM DECK

TO/FROM AVCP
5.3VA

23 MODE S3

H.A.SW

D.V.Sync

V. ENV

V.H.SW30

9 18 13 16

59

LD CTL

CFG

DPG

90 87 12

CAP. REV 'H'

24 MODE S2

76 95 94

CTL -

77

I-Limit
25 MODE S1

CTL +

11

GND
MODE S1
MODE S2
MODE S3
MODE S4

CAP. PWM

MS501

DRUM PWM

MODE S/W

CV IN

50

COMP IN

17

REC 'H' 74
C.ROT 15
A.MUTE'H' 84

DISPLAY

22 MODE S4

FLD DATA 68
FLD ENA 69
FLD CLK 70

62 VDR ENA
66 VDR DATA

To/FROM DVD

IC5F1

65 VCR DATA
67 VCR ENA

X502
14MHz
38 X in

OSC

5V

T-UP END

X501

ES501

32.768KHz

R550

A. ENV
A. H.SW
A. MUTE 'H'
REC 'H'

39 X out
35 Xc in

OSC

IC501
M37760

36 Xc out

ES502

R535

C534

CV OUT 52
AFT 100

R537
C535

R564

SUP END

RS501

R556

TO/ FROM TU/IF

IIC CLK 71
IIC DATA 72
VCR 'H' 26

20 SUP Sensor

R553

TO/FROM AUDIO(Hi-Fi)

74

IIC CLK 71
IIC DATA 72

21 T-UP Sensor

R557
LD501
DECK IR LED

8
19
68

80 T-UP Reel

R536

T-UP REEL
R555

RS502

R538
Vss (AMP)

Vss (OSD)

Vss (SYSCON)

Vcc (A/D)

Vcc (OSD)

Vcc
(SERVO)
Vcc
(SYSCON)

SUP REEL

C582

58 CST IN
14

CST.SW/REC TAP
5.3VA

POWER FAIL 78

88

49

40

99

53

98

79 SUP Reel

R558

37

R/C

CS501

R544

R5C6

GND
3

RESET
+

C500
R531

IC504
34

Vcc

2

1

Q503

+
C517

C552
+

Vcc

2

1

L512

C592
+

+

GND
3

R583

R529

IC505

5.3VA

R541
Q501

RC601

5V
C503

C561

L501

LGXBR446 (LGEUS)

3-24

3-25

4. JACK BLOCK DIAGRAM

VIDEO SW IC
To.AVCP

7

To Hi-Fi

IC601

To.AVCP
3

5

1

JK601
A/V JACK

From
AVCP

AV1 Video in
AV1 Audio in

PMD02
1) Front Video

To TUNER
MOD VIDEO

IC601
VIDEO AMP IC

3) Mixed Video

(L/R)

4

23

Video Out

9) Y (Super)

6

21

Y Out (Super)

11) C (Super)

2

26

C Out (Super)

13) Y

10

20

Y Out (Comp)

15) Pb

12

18

Pb Out (Comp)

17) Pr

14

16

Pr Out (Comp)

5) VDR CVBS
7) VCR Video

19) VCR A-L
21) VCR A-R
23) VDR A-L

Audio Out L

25) VDR A-R

Audio Out R

27) Front A-L

Coaxial Out

IEC-958
From PMD01 1 Pin

29) Front A-R

JK603
Optical Jack

From/To Hi-Fi IC801

LGXBR446 (LGEUS)

3-26

3-27

V.OUT

NC

TU 30V

SIF

A.OUT

AFT

DATA

CLOCK

ENABLE

NC

RF AGC

V.IN

CONTROL

REG 5V

CH S/W

A.IN

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

999 GND

5. STUNER/MTZ BLOCK DIAGRAM

716 MOD A.IN
61

MOD CTL

106 5V
26

VCR 'H'

671 MOD VEDIO
TU.V.OUT 731

71

IIC CLK

72

IIC DATA

33V 458
AFT 100
781 SIF OUT

LGXBR446 (LGEUS)

3-28

3-29

3-30
94

95

EQ
AMP

3-31
4

DVD'L'

LINE 1 'R'
LINE 1 'L'
LINE 2 'R'
LINE 2 'L'

2

48

DVD'R'

18

IC301
HA118725NF

EQ
AMP

CLOCK

74
DATA

DATA

9

14

10

15

IC801
AN3662(AN3663)

73

74

CLOCK

VCA

73

VCA
62

62

57

53

62

61

A.OUT'L'

A.OUT'R'

NORMAL
AUDIO
OUT

DVD

From u-COM (System)

6

From u-COM (System)

6

6

2

VCA

REC
AMP

DET

HA118725NF

IC301

OUTPUT
SELECTOR

IC801
AN3662(AN3663)

OUTPUT
SELECTOR

53

57

53

57

98

A. OUT (R)

A. OUT (L)

A. OUT (R)

A. OUT (L)

2) PB Mode

AUDIO
OUT

TUNER
TU701

EQ

N.A.IN

96

94

95

96

IC801
AN3662(AN3663)

1) EE Mode

R/P HEAD

EQ

N.A.IN

R/P HEAD

IC301
HA118725NF

6. AVCP BLOCK DIAGRAM
3) REC Mode

CIRCUIT DIAGRAMS

IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE ALLEGRO ELECTRONICS CORPORATION.
ALL COMPONENTS SHOULD BE REPLACED ONLY
WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL

1. POWER(SMPS) CIRCUIT DIAGRAM

CIRCUIT. SPECIAL COMPONENTS ARE SHADED ON NOTE :
THE SCHEMATIC FOR EASY IDENTIFICATION.
1. Shaded( ) parts are critical for safety. Replace only
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFwith specified part number.
FER FROM THE ACTUAL CIRCUIT USED. THIS WAY,
2. Voltages are DC-measured with a digital voltmeter
IMPLEMENTATION OF THE LATEST SAFETY AND
during Play mode.
PERFORMANCE IMPROVEMENT CHANGES INTO THE
SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.

No Digitron Displayed
D128,R107,ZD151 are Defective
No Power
BD101,TH01 is Defective

-28VA No Power
D127 is Defective

28V No Power
Q120 or ZD153 are Defective
No Power
D102 is Defective

5.3VA No Power
D121 is Defective

Switching Error
IC102,IC103 are Defective

30VA No Power
D130 is Defective

12V No Power
Q125 or ZD152 are Defective

12V No Power
D126 is Defective
28V No Power
D129 is Defective
12V No Power
IC157 is Defective

S/W Error
IC107,Q111 is Defective

5V No Power
IC151 is Defective

12V No Power
D125 is Defective

2.5V No Power
IC152 is Defective

5V No Power
D124 is Defective
1.8V No Power
D123 is Defective

S/W Error
IC101,IC104 is Defective

1.8V No Power
IC160 is Defective
No Power
F101 is Defective

3.3V No Power
D122 is Defective

3.3V No Power
IC154 is Defective
Switching Error
IC105,IC106 are Defective

NOTES)

Symbol denotes AC ground.

NOTES)

Symbol denotes DC chassis ground.

A

B

NOTE)
NOTE)
NOTE)
NOTE)

Warning
Parts that are shaded are critical
With respect to risk of fire or
electricial shock.

C

D

E

F

G

H

I

3-32

J

K

L

3-33

M

N

O

P

Q

R

S

T

2. TUNER CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-34

J

K

L

3-35

M

N

O

P

Q

R

S

T

3. A/V CIRCUIT DIAGRAM

6

10

2
2

1

2

14

3
2
9

2

7

WAVEFORM

4
11

12

8

13

3

A

B

C

D

E

F

G

H

I

3-36

J

K

L

3-37

M

N

O

P

Q

R

S

T

4. Hi-Fi CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-38

J

K

L

3-39

M

N

O

P

Q

R

S

T

5. SYSTEM CIRCUIT DIAGRAM

4

5

3

6

2

1

7

WAVEFORM

A

B

C

D

E

F

G

H

I

3-40

J

K

L

3-41

M

N

O

P

Q

R

S

T

6. JACK CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-42

J

K

L

3-43

M

N

O

P

Q

R

S

T

7. TIMER CIRCUIT DIAGRAM( 2 TOOL )

A

B

C

D

E

F

G

H

I

3-44

J

K

L

3-45

M

N

O

P

Q

R

S

T

8. TIMER CIRCUIT DIAGRAM( 3 TOOL, 8 TOOL )

A

B

C

D

E

F

G

H

I

J

3-46

K

L

M

3-47

N

O

P

Q

R

S

T

9. TIMER CIRCUIT DIAGRAM( 4 TOOL )

A

B

C

D

E

F

G

H

I

3-48

J

K

L

3-49

M

N

O

P

Q

R

S

T

10. TIMER CIRCUIT DIAGRAM( 6 TOOL )

A

B

C

D

E

F

G

H

I

J

3-50

K

L

M

3-51

N

O

P

Q

R

S

T

11. TIMER CIRCUIT DIAGRAM( 7 TOOL )

A

B

C

D

E

F

G

H

I

3-52

J

K

L

3-53

M

N

O

P

Q

R

S

T

WAVEFORMS
✦ IC301 Oscilloscope Waveform

✦ IC501 Waveform Photographs

IC301 Pins 8, 9
PB mode
500mvp-p

IC301 Pins 15, 17,
19, 21
Video in 1Vp-p

IC301 Pin 31
PB/REC mode
4.0Vp-p

IC301 Pin 98
REC mode
1.1Vp-p

IC301 Pin 94
REC mode
2.0Vp-p

IC301 Pin 29
PB mode
2.02Vp-p

IC301 Pin 57
PB mode
400mVp-p

IC301 Pin 63
PB mode
400mVp-p

IC301 Pin 73
PB/REC mode
5Vp-p

IC301 Pin 74
PB/REC mode
5Vp-p

IC301 Pin 77
REC mode
340mVp-p

IC301 Pin 42
PB mode
300mVp-p

IC301 Pin 53
PB mode
400mVp-p

IC301 Pin 80
PB mode
3.6Vp-p

3-54

V.HSW
(IC501 Pin 18)
1V/10mS
REC/PB MODE

DV.SYNC
(IC501 PIN 13)
1V/100uS
QUE/REV MODE

CTL(+)
(IC501 Pin 95)
1V/10mS

DFG/DFG
(IC501 PIN 90)
1V/10mS
REC/PB MODE

CFG
(IC501 Pin 87)
1V/10mS

V.IN
(IC501 Pin 49)
500mV/20uS

3-55

CTL(-)
(IC501 Pin 94)
1V/10mS

• CIRCUIT VOLTAGE CHART
MODE
PIN NO.

EE

PLAY

IC301

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY

MODE
PIN NO.

EE

PLAY
5.96

55

2.07

2.09

9

4.98

5.30

64

0

0

18

0

0

7

3.28v

3.74

17

0

0

3

6.02

1

0.06

0.06

56

0.00

0.00

10

4.8

4.80v

65

2.36

2.36v

19

4.88

4.88

8

3.28

3.24

18

2.28

2.74

4

0

0

2

0.06

0.06

57

2.18

2.18

11

4.82

4.82

66

0

0

20

0

0

9

3.28v

3.24

19

0

0

5

6

5.96

3

0.06

0.06

58

2.34

2.34

12

4.72v

4.82

67

4.68

9.68v

21

0

0

10

3.28

3.24

20

2.56v

2.58

6

5.99

5.94

4

0.35

0.37

59

4.94

4.97

13

4.92

4.92

68

0

0

22

0

0

11

3.28v

3.26

21

2.64v

2.68

7

22.3m

21.3m

5

2.35

2.09

60

4.94

4.97

14

5.02

5.02

69

2.48

2.48v

23

0

0

12

0

0

22

0

0

8

6.68

6.65

6

2.58

2.55

61

0.02

0.02

15

0

0

70

2.48

2.48

24

0

0

13

3.78

4.52

23

2.56v

2.92

9

6.7

6.67

7

2.83

2.83

62

2.28

2.21

16

4.98v

4.98

71

0

0

25

0

0

14

0

0

24

0

0

10

1.1m

0

8

1.84

1.24

63

2.23

2.23

17

5.04

5.04

72

2.48

4.98

26

0

0

15

0

640m

25

0

0

11

6.71

6.68

9

1.84

1.23

64

2.94

2.95

18

4.98v

9.98

73

4.92

4.92v

27

0

0

16

5.82

6.64

26

2.52v

2.98

12

5.04

5.05

10

2.41

1.89

65

2.26

2.26

19

2.46v

2.46

74

0

0

28

0

0

17

5.28v

6.68

27

20m

0

13

12.03

11.99

28

4.72

4.68

14

6.7

6.7

15

0

0

16

6.73

6.69

11

2.61

3.00

66

2.95

2.96

20

3.36V

3.36

75

2.52

2.42

29

0

0

18

0

620m

12

1.60

0.56

67

2.19

2.18

21

0

0

76

2.42

2.48

30

2.96v

3.98

19

6.28

6.66

13

0.00

0.00

68

1.28

1.24

22

0

0

77

80m

80m

31

2.96

3.98

20

6.28

6.72

1

2.51

2.51

14

2.80

2.26

69

1.96

1.96

23

4.96v

4.96v

78

0

0

32

0

0

21

4.46v

4.42

2

2.39

2.39

15

2.80

2.38

70

2.71

1.42

24

120mv

140m

79

4.02v

4.96v

33

4.88v

4.88

22

3.28

4.02

3

3.54

3.53

1

1.3

16

0.18

1.91

71

2.19

2.19

25

4.94

4.94

80

4.96v

4.96

34

3.64v

3.58v

23

3.62

3.68

4

2.57

2.56

2

4.9

4.9

17

2.79

2.80

72

0.14

0.14

26

4.92v

4.92v

81

2.8

280m

35

0

0

24

3.74

4.12

5

1.52

1.34

3

1.66

1.56

18

1.76

1.91

73

5.20

5.21

27

20m

20mv

82

1v

2.62v

36

2.62v

2.58

25

3.74

3.76

6

0.43

3.68

4

0

0

19

2.80

2.80

74

5.20

5.21

28

5.02

5.02v

83

120m

3.24v

37

0

0

26

0.1

640m

7

1.3m

0

5

0

0

20

0.02

0.00

75

2.76

2.79

29

4.98v

4.98

84

0

1.96

38

0

0

27

0

0

8

1.2m

0

6

4.9

4.9

21

2.80

2.80

76

2.25

2.17

30

4.84v

4.84

85

0

0

39

0

0

28

3.7v

3.68

9

3.04

3.03

7

1.7

1.6

22

5.08

5.12

77

2.84

2.84

31

5.00v

5.00v

86

4.98

4.9v

40

2.54v

2.54

29

3.66

3.64

10

2.52

2.52

8

0

0

23

2.32

2.34

78

0.02

0.03

32

0

0

87

4.98

4.98

41

2.54

2.56

30

0.7

680m

11

2

2.05

24

0.18

0.57

79

0.00

0.00

33

4.98

4.94

88

5.0v

5.0v

42

2.48

2.48

31

3.72

3.72v

12

3.22

1.97

1

1.37

25

2.12

2.12

80

2.54

2.53

34

0

5.00v

89

0

0

43

2.3v

2.34

32

3.74v

4.08

13

3.99

3.99

2

5

5

26

3.00

2.80

81

4.85

4.84

35

5.02

100m

90

4.88

4.88v

44

0

0

33

3.62

3.68

14

2.5

2.495

3

2.18

2.17

27

0.18

0.45

82

4.15

4.15

36

3.16

3.12v

91

0

0

34

13.4v

13.32

15

3.11

1.93

4

0

0

28

0.15

0.15

83

0.00

2.53

37

5.7v

Da/Clk(5.5)

92

0

0

1

0

0

35

580m

520m

16

3.2

3.18

5

0

0

29

2.48

2.46

84

5.07

5.10

38

0

5.7v

93

5.04v

5.04v

2

0

0

36

0

520m

17

27.4m

4.11

6

5.21

5.21

30

2.80

2.91

85

2.46

2.30

39

520m

0

94

4.88

0

3

0

142M

37

580m

520m

18

112.1m

3.35

7

2

2.17

31

0.37

0.37

86

2.54

2.30

40

4.84

520m

95

4.98

4.98

4

DA/CL(5.34)

DA/CL(5.34)

38

0

0

19

2.27

2.26

8

0

0

32

2.31

2.79

87

2.45

2.30

41

4.83

Da/Clk(5.62)

96

0

0

5

DA/CL(5.34)

DA/CL(5.34)

39

0

20m

20

1.99

2.12

33

2.09

2.13

88

0.00

0.00

42

4.86v

4.86v

97

0

0

6

0

0

40

4.7

4.76

21

2.31

2.37

34

1.76

1.85

89

2.48

2.30

43

0

0

98

4.98

4.98

7

DA/CL(5.34)

DA/CL(5.34)

41

0v

1.68

22

0.78

0.81

35

3.03

3.07

90

2.52

2.30

44

5.02

5.0v

99

20m

4.98v

8

0

0

42

5.0v

5.04m

23

5.02

5.01

36

2.32

2.35

91

2.48

2.30

45

0

0

100

0

0

9

DA/CL(5.34)

DA/CL(5.34)

43

50.v

4.96

24

5.02

5

37

3.03

3.06

92

5.08

5.11

46

3.94

3.94v

10

DA/CL(5.34)

DA/CL(5.34)

44

20m

3.38

25

2.44

2.27

38

2.15

2.20

93

0.52

0.51

47

2.88

2.88v

1

4.88

4.88v

11

0

41M

26

2.44

2.26

39

1.42

1.45

94

2.53

2.54

48

0

0

2

1.46

1.48

12

DA/CL(2.82)

DA/CL(2.82)

1

4.76

4.68

27

2.82

2.85

40

2.08

2.12

95

2.53

2.52

49

0.98

2.94

3

1.38

1.38

13

0

0

2

2.02v

2.24

28

181.5m

187.4m

41

3.01

2.55

96

2.53

2.50

50

1.84

1.94v

4

0

0

14

DA/CL(2.82)

DA/CL(62M)

3

4.88

4.88

29

371.6m

212.2m

42

1.98

1.97

97

0.01

0.01

51

0.98

4.78

5

2.26v

2.24

15

2.89

1.41

4

1.64

1.78

30

2.08

2.08

43

2.05

2.05

98

2.27

2.55

52

3.28

3.28v

6

2.38

0

16

1.53

950M

5

4.72

4.78

44

0.00

0.00

99

0.00

0.00

53

2.38

2.38v

7

0

0

17

DA/CL(1.14)

DA/CL(810M)

6

1.88

1.88

1

3

2.99

45

3.13

3.15

100

2.58

2.55

54

2.52

2.54v

8

0

0

18

0

0

7

0

0

2

36.3m

38.1m

46

3.13

3.15

47

5.03

5.07

1

48

0.14

0.14

2

49

3.17

3.19

3

50

5.03

5.07

4

51

2.05

2.07

52

5.03

53
54

IC501

IC751

IC7V1

IC901

IC901

IC302

55

1.88

1.88

9

0

0

19

5.26

5.24

8

2.26

2.18

3

3.04

3.04

0

56

0

0

10

0

0

20

5.26

5.24

9

0

0

4

6.4m

39.1m

4.52

4.82

57

0

0

11

0

5.0v

10

1.64v

1.72

5

3.04

3.04

4.84

4.84v

58

120m

120m

12

5.0v

5.0

1

3.28

3.24

11

0

0

6

5.02

5.03

4.64

4.58v

59

4.92v

4.92v

13

5.0v

0

2

3.28v

3.28

12

1.92v

2.08

7

2.24

2.23

5

4.56

4.56v

60

4.92v

4.92v

14

0

0

3

3.32

3.26

13

4.86

4.82

8

0

0

5.07

6

80m

60m

61

0

0

15

0

0

4

3.28

3.92

14

1.92v

2.08

2.62

2.64

7

0

0

62

4.82

4.82v

16

0

0

5

3.28

3.92

15

0

2.31

1

6.71

6.66

0.00

0.00

8

4.98

4.98

63

3.98

3.98v

17

0

0

6

3.28

3.26

16

2.26v

2.64

2

5.05

5.05

0

3-56

IC801

3-57

IC804

IC902
1.3

IC903
1.37

PRINTED CIRCUIT DIAGRAMS
1. VCR P.C.BOARD

3-58

3-59

2. SMPS P.C.BOARD

LOCATION GUIDE

3-60

3-61

3. JACK P.C.BOARD
( 2 TOOL, 3 TOOL )

( 6 TOOL )
LOCATION GUIDE
LOCATION GUIDE

( 4 TOOL, 8 TOOL )
LOCATION GUIDE

3-62

3-63

5. KEY P.C.BOARD

6. Timer P.C.BOARD

( 2 TOOL )

( 2 TOOL )

( 3 TOOL )

( 3 TOOL )

( 4 TOOL )

( 4 TOOL )

( 6 TOOL )

( 6 TOOL )

( 7 TOOL )

( 7 TOOL )

( 8 TOOL )

( 8 TOOL )

3-64

3-65

VDR PART
VDR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
No 3.8VA

Is the F101
Normal?

No 3.3V

NO

Replace the F101
(Use the same Fuse)

Is there about 3.8V NO
at the IC154 pin1?

YES

Is the BD101
Normal?

YES

NO

Is there about 3.3V~ 5V NO
at the IC154 pin4?

Replace the BD101

YES

Is the TH01
Normal?

YES

NO

Check the IC154 and
Replace

Replace the TH01

YES

NO
Is Vcc (14V-17V)
supplied to IC101 Pin7?
YES

Is the IC107,Q111
Normal?
NO
Check or Replace
the IC107,Q111

Are the D122
normal?

NO

Replace the D122

YES

Is there about 2.5V NO
at the IC106 Pin1?

Replace the IC106

YES

Is the D123
normal?

NO

Replace the D123

YES

Is the D124
Normal?

NO

Replace the D124

YES

Is the D125
Normal?

Check or Replace
the D122

NO

Replace the D125

YES

Power Line of Main
PCB(VDR) is short
3-66

Check the ‘DVD PWR CTL
“H”’ signal from µ-com

VDR ELECTRICAL TROUBLESHOOTING GUIDE

No 2.5V

No 5.0V

Is there about 3.8V NO
at the IC152 pin1?

Is there about 5.5V NO
at the IC151 pin1?

Check or Replace
the D122

YES

YES

Is there about 3.3V~ NO
5V at the IC152 pin4?

Is there about 3.3V~ 5V NO
at the IC151 pin4?

Check the ‘DVD PWR CTL
“H”’ signal from µ-com

Check the ‘DVD PWR CTL
“H”’ signal from µ-com

YES

YES

Check the IC152
and Replace

Check the IC151
and Replace

No 1.8V

No 12V

Is there about 2.3V NO
at the IC160 pin1?

Is there about 13.5V NO
at the IC157 pin1?

Check or Replace
the D123

Check or Replace the
D125

YES

YES

Is there about 3.3V ~
5V at the IC60 pin4?

Check or Replace
the D124

NO

Is there about 3.3V~ NO
5V at the IC157 pin2?

Check the ‘DVD PWR CTL
“H”’ signal from µ-com

YES

YES

Are the R167,R168 NO
normal?

Check or Replace
the R167,R168

Check the IC157 and
Replace

YES

Check the IC160
and Replace

3-67

Check the ‘DVD PWR CTL
“H”’ signal from µ-com

VDR ELECTRICAL TROUBLESHOOTING GUIDE
2. No Component video signal when playing DISC

Component : No Y Signal

Component : No Pb Signal

YES
R905, C923

YES
NO

R904, C922

YES
IC601 – 10
Check input

Component : No Pr Signal
YES
NO

YES
NO

IC601 – 12
Check input

YES

YES

R903, C921
YES

NO

IC601 – 14
Check input
YES

NO
C906

C907
YES

YES

FL505, FL506, FL507
Check Signal in DVD
Board
YES
Check CLK X101
YES
Check IC101 Power and
Other Circuits

3-68

C908
YES

VDR ELECTRICAL TROUBLESHOOTING GUIDE
3. No COMPOSITE / S-VIDEO signal when playing DISC

COMPOSIT : No Signal

S-VIDEO : No Y Signal

YES
R911, C927

YES
NO

R902, C920

YES
IC601 – 4
Check input

S-VIDEO : No C Signal
YES
NO

YES
NO

IC601 – 6
Check input

YES

YES

R901, C919
YES

NO

IC601 – 2
Check input
YES

NO
C903

C904

YES

IC5101-40 : HIGH
/RST_VENC

YES
NO

R4103, R4107
Check Signal

YES
IC5101 41,42
Check I2C Clk, Data

NO

R154, R155
Signal and 3.3V level

YES
R5124~R5131
Check VO_D0 ~VO_D15

NO
Check R5101 CLOCK

YES
IC5101 9~16 Check
MP7~MP0 signal

YES
Check IC101 power
And Other circuits

3-69

C902
YES

VDR ELECTRICAL TROUBLESHOOTING GUIDE
4. No TV, External Input video signal

No : TV signal
YES
TU701 1-19
Check signal
And circuit
YES
IC802 - 28
YES

No : AV1 signal

No : AV2 signal

YES
IC802 - 1

YES
NO

IC802 - 3

YES

No : S-JACK
signal

AV3
YES
NO

IC301 - 17

YES

YES

YES
NO

IC501 – 1, 3, 8
check in the
DVD Board
YES
IC301 – 21
check

IC802 – 31
Check output
YES

YES

IC301 - 15
YES
IC301 – 29 check
YES
Q310 collector
Signal, power 12 V
YES
C909, Q905
Check circuit
YES
FL501
Check signal

IC502-34 : HIGH
/RST_VDEC

NO

R4103, R4106
signal

NO

Check R533,
R526 Signal and
3.3V level

NO

Check X501 clock
oscillated

YES
when reset IC502
– 28, 29 Check I2C
Clk, Data
YES
check IC502 - 40
(VI_CLK)
YES
IC502 -> IC101
NO
Check VI_D0~VO_D9
signal

Check IC502
power and other
circuits

YES
 Check

3-70

NO

Replace X501 XTAL

VDR ELECTRICAL TROUBLESHOOTING GUIDE
5. When playing DISC, no audio output
NO
IC802 – 15, 18
Check audio signals

7. No OPTICAL / DIGITAL output

Check IC802 power
and other circuits

PN303-1 signal
normal
YES

YES

IC802-10 Check
High?

NO

Check FFC Cable
Signal flow

Check AV_RST1 and
power, other circuits

YES

Check IC802 power
And Other circuits

6. No TUNER audio output

Audio output even NO
When playing DISC

Check FFC Cable
and VCR part

YES

NO

Check FFC Cable
and VCR part

IC803 – 1, 7 Check NO
audio signals

Check IC801 power
and other circuits

PN304-19~22 Check
audio signals
YES

YES

IC802-9 Check
High?

NO

Check AV_RST1 and
power, other circuits

YES

Check IC802 power
And Other circuits

3-71

NO

Check VCR PART

VDR ELECTRICAL TROUBLESHOOTING GUIDE
8. No External Input 1, 2 audio
Audio output even NO
When playing DISC

9. No External Input 3 audio
Audio output even NO
When playing DISC

 check

YES

YES

PN304-19~22 Check NO
audio signals

PN5401 – 4~6 Check NO
audio signals

Check FFC Cable
and VCR part

YES

NO
PN304-27~30 :
Check audio signals

Check IC804 power
and other circuits

YES

Check PN302-5,6
and Front Jack Cable

YES

NO

NO
PN304-19~22
Check audio signals

Check /RST-Audio and
power, other circuits

YES

Check FFC Cable
and VCR part

YES

NO
IC804 – 10, 12
Check audio signals

Check IC804 power
And Other circuits
YES

Check IC804 power
and other circuits

YES

NO
IC802 – 15, 18
Check audio signals

Check IC802 power
and other circuits

NO

Check /RST-Audio and
power, other circuits

NO
IC802 – 15, 18
Check audio signals

Check IC802 power
and other circuits

IC804-9 Check
High?

YES

IC802-10 Check
High?

Check Audio Cable

YES

NO
IC804 – 10, 12
Check audio signals

IC804-9 Check
High?

 check

YES

NO

Check AV_RST1 and
power, other circuits

Check IC804 power
And Other circuits
YES

YES

Check IC802 power
And Other circuits

YES

IC802-10 Check
High?
YES

Check IC802 power
And Other circuits

3-72

NO

Check AV_RST1 and
power, other circuits

3-73
VDR_reset_L

ATA_RESET
ATA_address[4:0]
ATA_data[15:0]
ATA_INT / IORDY / DIOR / DIOW / DMAACK

Int_Prog

DVD RW DRIVE

9_IN_2

VDR BOARD

2

IEC958

BD[15:0] 16
BA[12:1] 12
CON[8:0] 9

4

TP

2

V_VCR_IN

DV

2
2

A_IN
2

A_OUT
A2_IN

AV2_IN

Serial Comm.
4

3

D_control

V2
A2
Y/C

FRONT JACK BOARD

VCR BOARD

V_cvbs
YPbPr

3

2

6

A_R/L

2

D_out
TU_AV_out
TU_AV_in

Coaxial
Optical

Y/C

2

AV1

3

2

TUNER

D2

COAXIAL
OPTICAL

VCR_A_R/L

CVBS
YPbPr

Stereo

S_Jack

AV1_IN

REAR J ACK

BLOCK DIAGRAMS

1. VDR SET TOTAL BLOCK DIAGRAM

R_Pr_OUT
B_Pb_OUT
G_Y_OUT
C_OUT
Y_OUT
CVBS_OUT

YC_MIXER
V2_IN

3-74

DVD-RW DRIVE

9_IN_2

BD[15:0]
BA[12:1]
CON[8:0]

TP

Y/C

S_JACK_DET

V_VCR_IN
YC_MIXER

A_IN

A2_IN
V2_IN

DV

AV2_IN

Front Jack

AV2_IN

YC_MIXER

V_VCR_IN

A_IN

VCR Bo ard

MEMORY
CARD
UNIT

HOST_IF
UNIT

DV 1394
UNIT

VIDEO_IN
UNIT

AUDIO_IN
UNIT

SIO_SPI_...

VO_D[15:8]
VO_D[7:0]
CVBS
Y/C
R/G/B

AO_IEC958

AO_D[3:0]

ADD[4:0]....

DATA[15:0]

HD[15:0]

HD[0:15]

BIO_PHY_DATA[0:7]

DMN Board

VI_D[2:9]

AI_D0

DDR
Memory

CS0

SCL

SDA

Latc h
74LVT16373
BA[1:5,22]

IEC958

BA[1:22]

Int_Prog

D_Control

Serial Comm.

VDR_RESET_L

G_Y/B_Pb/R_Pr

Y/C/CVBS_OUT

BA[6:21]

FLASH
Memory

EEPROM

UCOM_IF
UNIT

VIDEO_OUT
UNIT

AUDIO_OUT
UNIT

A_OUT

SDA
SCL

CPRM_crl

I/P

D2

U-COM

Y/Pb/Pr

Y/C/CVBS

COX/OPT

VDR_A

VCR Bo ard

2. VDR MAIN H/ W BLOCK DIAGRAM

E5_1V8

E5_5VD

E5_2V5

1.8V

5VD

2.5V

3-75
VTT

1.25V

G2995

2.5V SSTL2_VDD
2.5V
E5_2V5

SDRAM
DDR

VREF

1.25V

E5_3V3

3.3V

DMN8602

FLASH

2.5V

3V3 1.8V 3V3D

74LVC08

74LVC541

74LVC04

74LVC32

74LVT273
74LVC245

74LVT16245

74ALVT16373

VA_H

CS4351

74HCT125

24LC168

VL CS5340
VA

VL

VA

NJM2274

V33PHY

TSB41AB1

A18VDD
DVDD A33VDD

L2146

IOVDD

VDDA

SAA7120

VDDD

5VD

3.3VA

MC33202

MC33202

3V3

+12V

+12V

1.8V

2.5V

3.3V

3.3VA

5VD

3. POWER BLOCK DIAGRAM

3-76

A_R_OUT

A_L_OUT

VCR Bo ard

A2_R_IN

A2_L_IN

Front Jack

A2_R_IN

A2_L_IN

A_R_IN

A_L_IN

VCR Bo ard

(MC33202)

OP AMP

(MC33202)

OP AMP

DAC_R

DAC_L

ADC_R

ADC_L

ADC

(CS4351)

DAC

/RST_AUDIO

(CS5340)

MCLK
SCLK
LRCK
SDOUT

MCLK
SCLK
LRCK
SDIN
SCL
SDA

AO_MCLK0
AO_SCLK
AO_FSYNC
AO_D0
SCL
SDA

AV_RST1

AI_MCLK0
AI_SCLK
AI_FSYNC
AI_D0

DMN8602

4. AUDIO IN/ OUT BLOCK DIAGRAM

3-77
MEMC_RST

GPIO1

GPIO4

E5_RST

HD[0:15]

/E5_OEL

HD[0:15]

[1:5,22]

E5_ALE

BD[0:15]

GND

HD[0:15]

/RST_VDEC
/RST_VENC
/RST_ PHY
/RST_AUDIO

GPIO2

/CS2

E5_MA[1:5,22:26]

HD[0:15]

DMN8602

CS0
E5_WEL
E5_OE

Flash

Q

LAN_CS

BD[0:15]

BA[1:5,22]

BA[6:21]

BA[1:22]

74LVC04

/BA[20:21]

74LVC32

BA[20:21]

BA21

MEM_CON_SIG

Memory
Card

74LVT16245

G

D OE

74LVT16373

4(8)MByte

/RST_SMS
C

SMSC_IRQ

BA[1:17]

BD[0:15]

Ethernet
LAN91C111

/SMSC_CS

5. CPU & CONTROL REGISTER BLOCK DIAGRAM

3-78

Y_IN
C_IN

V2_IN

Front Jack

V2_IN

V2_MIX_OUT

Y_OUT
C_OUT
CVBS_OUT
G_Y_OUT
R_Pr_OUT
B_Pb_OUT

V_VCR_IN

VCR Bo ard

YC MIX
(NJM2274)

MIX_OUT

14.3MHz

VENC
(SAA7120)

VO_D[7:0]
VO_CLK

/RST_VENC

/RST_VDEC

VDEC
(L21146)

VI_CLK0
VI_VSYNC0
VI_D[9:0]

DMN 8602

Y
C
CVBS
G/Y
R/Pr
B/Pb

VO_CLK

VO_D[7:0]

GPIO

SCL
SDA

VI_CLK0
VI_VSYNC0
VI_D[9:0]

6. VIDEO IN/ OUT BLOCK DIAGRAM

DV

Front Jack
TPA1+-/TPB1+1

DV 1394
(TSB41AB1 )

/RST_PHY

3-79

GPIO

PHY_DATA[7:0]
PHY_CTL[1:0]
PHY_LREQ
PHY_LPS
PHY_LINK_ON
PHY_CLK

DMN 8602

7. DV 1394 IN/OUT BLOCK DIAGRAM

9_IN_2

Header H601

ATA_CON_SIG

READY

DR/DW/RST

PA[2:0]

PD[15:0]

74LVC32
IC6904

BUS
BUFFER
IC6901~
IC6903

/BA[21:20]

IO_READY

MEMC_OE/WE/RST

BA[18:16]

HD[15:0]

CS2

Host IF
Blo ck

BA[21:20]

WAIT

OE/WE/RST

3-80

/CS2

/WAIT

GPIOExt

E5_ALE

HD[15:0]

DMN8602

8. MEMORY CARD IN/ OUT BLOCK DIAGRAM

CIRCUIT DIAGRAMS
1. BGA 308P CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-81

J

K

L

3-82

M

N

O

P

Q

R

S

T

2. DDR & B TO B CONNECTOR CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-83

J

K

L

3-84

M

N

O

P

Q

R

S

T

3. POWER, FLASH, CONNECTOR CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-85

J

K

L

3-86

M

N

O

P

Q

R

S

T

4. RST, CONTROL/STATUS_REG., ATAPI, HOST_CPLD, LATCH CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-87

J

K

L

3-88

M

N

O

P

Q

R

S

T

5. VIDEO_IN, VIDEO_OUT CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-89

J

K

L

3-90

M

N

O

P

Q

R

S

T

6. DV1394, HDMI CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-91

J

K

L

3-92

M

N

O

P

Q

R

S

T

7. AUDIO IN/OUT CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

3-93

J

K

L

3-94

M

N

O

P

Q

R

S

T

• WAVEFORMS

X101
13.5MHz

IC5101
PIN42
SDA

IC502
PIN29
SDA

PN303
PIN1
IEC958

IC802
PIN4
ADAC_MCLK

IC802
PIN2
ADAC_SCLK

IC502
PIN40
VI_CLK

IC502
PIN74
14.318MHz

PN304
PIN5
CVBS_OUT

IC802
PIN3
ADAC_LRCK

IC804
PIN4
ADC_SDATA(AI_D0)

IC802
PIN1
DAC_SDATA(AO_D0)

PN304
PIN9
Y_OUT

PN304
PIN11
C_OUT

PN304
PIN17
R_Pr_OUT

IC502
PIN53
VI_D1

PN7401
PIN 12
VDR_CLK

PN7401
PIN 13
VDR_DIN

PN304
PIN13
G_Y_OUT

PN304
PIN15
B_Pb_OUT

IC5101
PIN4
VO_CLK

PN7401
PIN 14
VDR_DOUT

PN7401
PIN 15
VDR_ENB

3-95

3-96

• CIRCUIT VOLTAGE CHART
MODE
PIN NO.

EE

PB

REC

IC1201
1

0

0

MODE
PIN NO.

EE

PB

REC

MODE
PIN NO.

EE

PB

REC

MODE
PIN NO.

EE

PB

REC

MODE
PIN NO.

EE

PB

REC

MODE
PIN NO.

EE

PB

REC

MODE
PIN NO.

EE

PB

REC

16

0.19

0.19

0.19

22

0

0.04

0.04

28

3.24

3.254

3.253

2

0

0.004

0.006

3

3.24

3.18

1.68

29

3.12v

3.08

1.81

0

17

0.19

0.19

0.19

23

0

3.29

3.29

29

3.22

3.255

3.25

3

32m

0.314

0.321

4

2.24

2.82

1.64

30

3.12v

3.12v

1.81

2

0

0

0

18

3.29

3.29

3.29

24

0

0

0

30

0

0.954

0.978

4

0

0.397

0.402

5

3.16

3.14

1.65

31

3.12

3.08v

1.82

3

1.02

1.02

1.23

19

0.19

0.19

0.19

25

0

0.01

0.01

31

1.7

1.855

1.852

5

3.22

3.091

3.224

6

0

0

1.64

32

0

0

0

4

1.02

1.01

1.23

20

0

0.19

0.19

26

0

0

0

32

0

0

0

6

3.24

3.079

3.204

7

3.24

3.24

1.64

33

0

0

0

5

2.37

2.48

2.47

21

0

0

0

270

0

0

33

0

0

0

7

0

0.007

0.006

8

3.22

3.24

0

34

1.24

1.22

1.21

6

2.34

2.48

2.47

22

0.19

0.19

0.19

28

0

0

0

34

3.22

3.254

3.252

8

1.36

1.423

1.422

3.26

7

2.34

2.48

2.47

23

0

0.19

0.19

29

0

0

0

35

0

1.029

0.964

8

1.08

1.22

1.22

24

3.28

3.29

3.29

30

0

0

0

36

0

1.029

0.522

1

0

20mv

25

3.29

3.29

3.29

31

0

3.29

3.29

37

0

0

0

2

0

1

0

0

0

26

0

0

0

32

0

0

0

38

3.24

3.252

3.252

3

0

2

3.14

3.29

3.27

27

0

0

0

33

0

0

0

39

0

0

0

4

3

4.88

4.96

4.96

28

0

0

0

34

0

0

0

40

2.54

1.566

1.566

5

4

0

0

0

29

0

0

0

35

0

0

0

41

1.78

1.855

1.854

IC302

9

3.22

3.24

4.94

35

3.24

1.22

10

3.22

3.24

4.94

36

0

8

0

1.122

11

3.24

3.24

3.25

37

3.24

3.1

3.26

0.005

0.01

12

1.22

1.12

3.25

38

0

1.48

0

0.004

0.009

13

12.2v

3.36

0.01

39

1.34

3.22

1.4

2.04

1.628

1.616

14

14.2v

1.2

3.25

40

3.28

3.28

3.26

0

0.006

0.008

15

4.28

0

2.42

41

0

3.22

0

6

3.21

3.232

3.186

16

0

14.2

2.49

42

1.48

1.48v

1.49

IC5101

5

0

0

0

30

0

0

0

36

0

0

0

42

90m

0

0

7

3.18

3.206

3.16

17

14.2v

12.1

2.41

43

1.48

1.48v

1.49

6

4.88

0.01

0.01

31

3.29

3.29

3.29

37

0

0

0

43

3.08

1.642

1.642

8

3.18

3.229

3.183

18

4.34

4.34

2.41

44

2.96

3.24

3.26

7

0

0

0

32

0

0

0

38

0

0

0

44

2.88

1.643

0.199

9

3.22

1.57

1.812

19

14.2

12.2

2.48

45

3.24

3.24

3.26

8

4.94

3.97

3.97

33

0

0

0

39

0

0

0

45

2.88

0.399

0.405

10

2.82

0.969

1.068

20

3.21

3.22

4.95

46

0

0

0

9

3.22

2.64

2.64

34

0

0

0

40

0

0

0

46

2.92

1.299

1.303

11

2.82

1.316

0.996

21

0

0

0.01

47

0

0

0

10

0

0

0

35

0

0

0

41

0

0

0

47

2.68

0.369

0.37

12

2.88

1.381

1.492

22

4.79

4.78

4.79

48

2.88

2.88

0

11

4.88

4.2

4.2

36

0

0

0

42

3.16

3.29

3.29

48

3.24

3.252

0.252

13

2.9

0.982

1.152

23

4.91

4.91

4.91

12

4.96

4.3

4.3

37

0

0

0

43

0

0

0

49

0

0

0

14

3.26

1.25

1.092

24

2.52

2.51

2.51

13

0

0

0

38

0

0

0

44

0

0

0

50

2.64

0.372

0.376

15

3.26

1.232

1.07

25

2.42

2.41

2.41

14

4.84

4.97

4.97

39

0

0

0

45

0

0

0

51

2.64

0.369

0.379

16

2.96

1.206

1.111

26

2.42

2.41

2.41

40

0

0

0

46

0

0

0

52

2.64

0.382

0.372

17

3.22

3.246

3.183

27

2.52

2.52

2.51

IC402
1

3.14v

3.29

3.29

41

0

0

0

47

0

0

0

53

2.64

0.392

0.397

18

0

0.006

0.005

28

4.89

4.88

4.89

2

3.14v

3.32

3.32

42

3.29

3.28

3.29

48

0

0

0.01

54

2.64

1.855

0.382

19

0

0.262

0.18

IC601

EE

NO Conn.

REC

3

3.14v

3.29

3.29

43

0

0

0

55

1.28

0.39

1.852

20

3.24

3.247

3.192

1

2.64

2.64

1.62

4

0.04

0.04

0

44

0

0

0

1

0

0.001

0.001

56

20m

1.855

0

21

3.24

3.246

3.19

2

3.42

3.52

1.06

5

0

0.04

0

45

0

0

0

2

0

0.002

0.004

57

3.24

0

0.866

22

0

0.006

0.007

3

3.42

3.48

0.01

6

0

0

0

46

0

2.92

0

3

0

0

0

58

0

1.059

0.7

23

0

0.006

0.008

4

3.54

3.58

0.5

7

0

0

0

47

0

2.92

0

4

3.22

3.256

3.255

59

0

1.056

0.759

24

1.06

0.941

0.943

5

3.56

3.62

0.5

8

3.14

3.29

3.29

48

3.29

3.29

3.29

5

3.22

3.256

3.255

60

0

1.05

0.716

25

3.24

3.215

3.19

6

0

0

0.02

IC406

IC502

9

3.14

5.09

5.9

6

0

0

0

61

3.24

3.253

3.252

26

0

0.006

0.008

7

0

0

0.02

10

3.14

3.29

3.29

1

0

0

0

7

0

0.002

0.002

62

0

0

0.099

27

1.08

0.827

0.91

8

0

0

0.02

11

3.14

3.29

3.29

2

0

0.04

0.04

8

0

0.001

0.002

63

0

0.944

1.004

28

2.24

3.216

3.197

9

0

0

0.02

12

4.98

5.09

5.09

3

0

0.04

0.04

9

0

0.001

0.002

64

0

0.965

0.669

29

0

0.006

0.019

10

0

0

0.02

13

3.14

3.29

3.29

4

0

0

0

10

0

0

0

65

0

0.879

0.93

30

0

0.796

0.872

11

0

0

0.02

14

3.14

3.29

3.29

5

0

3.29

3.29

11

1.78v

1.854

1.851

66

0

0.943

1.034

31

3.22

3.216

3.194

12

0

0

0

6

0

3.29

3.29

12

1.78

1.854

1.851

67

1.78

1.856

1.852

32

0

0.006

0.006

13

3.26

3.27

3.26

IC405
1

3.28

3.28

3.29

7

3.14

3.29

3.29

13

0

0

0

68

0

0

0

33

0

0.007

0.008

14

0

0

0

2

3.31

0.19

0.19

8

0

0.04

0.04

14

1.78

1.854

1.851

69

0

0

0

34

3.24

3.185

3.165

15

0

0

0

3

3.22

0.19

0.19

9

0

0.04

0.04

15

0

0

0

70

3.18

1.022

1.054

35

0

0.006

0.007

1

60

0

0

4

0

0

0

10

0

0

0

16

0

0.002

0.002

71

0

1.53

1.53

36

3.24

3.207

3.19

17

0

0

0

5

0.19

0.19

0.19

11

0

0.04

0.04

17

0

0.001

0

72

0

2.942

2.942

37

0

0.009

0.01

18

0

0

0

6

0.19

0.19

0.19

12

0

0.04

0.04

18

0

0.002

0.002

73

0.8m

0.082

0.082

38

0

0.006

0.007

19

3.04

3.24

3.23

7

3.29

3.29

3.29

13

0

0.04

0.04

19

0

0

0

74

0.8m

0.082

0.861

39

3.234

3.204

3.188

20

3.04

3.26

3.11

8

0.19

0.19

0.19

14

0

0.04

0.04

20

3.22

3.255

3.255

75

0

0.792

0.672

40

3.24

3.212

3.199

21

3.04

3.26

3.26

9

0.19

0.19

0.19

15

0

0

0

21

3.22

3.255

3.255

76

1.78

1.852

1.848

41

3.24

3.21

3.197

22

3.04

3.2

3.25

10

0

0

0

16

0

0.04

0.04

22

0

0

0

77

0

0

0

42

3.24

3.209

3.195

23

0

0

0

11

0.19

0.19

0.19

17

0

0.04

0.04

23

1.08

0.17

0.17

78

1.78

1.853

1.849

43

20m

0.009

0.011

24

0

0

0

12

0.19

0.19

0.19

18

0

3.29

3.29

24

0.

0

0

79

0

0

0

44

20m

0.005

0.007

25

3.24

3.24

3.26

13

0.19

0.19

0.19

19

0

0.04

0.04

25

1.78

1.852

1.848

80

0

0.001

0.003

26

0

0

0

14

3.31

0.19

0.19

20

0

0.04

0.04

26

0

0

0

1

3.24

3.12

2.52

27

0

0

1.83

15

0

0

0

21

0

0

0

27

0

0

0

2

23.24

3.12

2.5

28

0

0

1.83

IC501
1

1.32

3-97

1.322

1.325

IC802

3-98

PRINTED CIRCUIT DIAGRAMS
1. VDR P.C.BOARD(TOP VIEW)

3-99

3-100

2. VDR P.C.BOARD (BOTTOM VIEW)

3-101

3-102

SECTION 4 MECHANISM OF VCR PART(D-37)
CONTENTS
DECK
MECHANISM PARTS LOCATIONS
• Top View......................................................4-1
• Bottom View ...............................................4-1

DISASSEMBLY AND
ASSEMBLY OF DECK MECHANISM
01.Disassembly of Drum assembly ................4-2
02.Disassembly of Plate top disassembly..... 4-4
03.Holder Assembly CST ...............................4-4
04.Disassembly of Gear Assembly
Rack F/L....................................................4-4
05.Opener Door .............................................4-4
06.Arm Assembly F/L .....................................4-4
07.Lever Assembly S/W .................................4-4
08.Motor Assembly L/D ..................................4-5
09.Gear Wheel ...............................................4-5
10.Arm Assembly Cleaner..............................4-5
11. Head F/E ...................................................4-5
12.Base Assembly A/C Head .........................4-5
13.Brake Assembly T .....................................4-6
14.Arm Assembly Tension..............................4-6
15.Reel S / Reel T..........................................4-6
16.Base Assembly P4 ....................................4-7
17.Opener Lid ................................................4-7
18.Arm Assembly Pinch .................................4-7
19.Arm T/up ...................................................4-7
20.Supporter, Capstan ...................................4-8
21.Belt Capstan/Motor Capstan .....................4-8
22.Lever F/R ..................................................4-8
23.Clutch Assembly D37 ................................4-8
24.Gear Drive/Gear Cam ...............................4-9
25.Gear Sector...............................................4-9
26.Brake Assembly Capstan ..........................4-9
27.Plate Slider................................................4-9
28.Lever Tension ............................................4-9
29.Lever Spring..............................................4-9
30. Lever Brake..............................................4-9
31.Gear Assembly P2/Gear Assembly P3 ...4-10
32.Base Assembly P2/Base Assembly P3 ...4-10
33.Base Loading ..........................................4-10
34.Base Tension ...........................................4-11
35.Arm Assembly Idler Jog ..........................4-11

DECK MECHANISM ADJUSTMENT
• Fixtures and tools for service ................4-12
1. Mechanism Assembly Mode Check ........4-13
2. Previous Preparation for
Deck Adjustment .....................................4-14
3. Torque Measuring ...................................4-14
4. Guide Roller Height Adjustment..............4-15
4-1. Prior Adjustment...............................4-15
4-2. Fine Adjustment ...............................4-15
5. Audio/Control (A/C) Head Adjustment......4-16
5-1. Prior Adjustment...............................4-16
5-2. Tape Path Check between Pinch
Roller and Take-up Guide ................4-17
5-3. Fine Adjustment
(Azimuth Adjustment).......................4-17
6. X-distance Adjustment ............................4-17
7. Adjustment after Drum Assembly
(Video Heads) .........................................4-18
8. Tachometer Adjustment of
Deck Assembly........................................4-18
8-1. Check of Audio, RF Normalization
Time (Locking Time) in Play after
CUE or REV.....................................4-18
8-2. Check of Tape Curl and
Jam Status .......................................4-18

PROTECTION, MAINTENANCE AND
CHECK OF VIDEO FUNCTION
1.
2.
3.
4.
5.

Checking Points before Repair ...............4-19
Essential Check and Repair....................4-20
Regular Check and Repair......................4-20
Tools for Check and Repair.....................4-20
Maintenance Process..............................4-20
5-1. Removal of Foreign Materials..........4-20
5-2. Grease Application...........................4-21

TROUBLESHOOTING GUIDE
1. Deck Mechanism.....................................4-23
2. Front Loading Mechanism.......................4-26

EXPLODED VIEWS
1. Front Loading Mechanism Section...........4-28
2. Moving Mechanism Section(1) .................4-29
3. Moving Mechanism Section(2) .................4-30

DECK MECHANISM PARTS LOCATIONS
• Top View
Procedure
Part

Starting
No.

9

2
2,3
2,3,4
2,3,4,5
4

2

3
6

5
10
8
12

11

18

1

16

33

17
19

14

2,3
2,3
2,3,13,14

17
17

15

17,18
13
35

7

21, 22

15

• Bottom View
20
32

21

31
31

24

32
21

25

24

34
28

23
27
22

29
30

26

21
21,22,23,
24,2526
21,22,23,
24,2526,27
21,22,23,
24,2526,27
21,22,23,
24,2526,27
25
2, 3, 14,
25, 31
25, 31
2,3,14

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

Drum Assembly
Plate Top
Holder Assembly CST
Gear Assembly Rack F/L
Opener Door
Arm Assembly F/L
Lever Assembly S/W

3 screws
2 hooks
6 chasses
1 hook
Chassis Hole
Chassis Hole
Chassis Hole,
1 hook
Motor Assembly L/D
1 screw
Gear Wheel
2 hooks
Arm Assembly Cleaner
Chassis Embossing
Head F/E
Chassis Embossing
Base Assembly A/C Head 1 screw
Brake Assembly T
1 hook
Arm Assembly Tension
1 hook
Reel S / Reel T
Shaft
Base Assembly P4
Chassis Embossing
Opener Lid
Chassis Embossing
Arm Assembly Pinch
Shaft
Arm T/up
1 hook
Supporter, capstan
Chassis Hole
Belt Capstan/Motor Capstan 3 screws
Lever F/R
Locking Tab
Clutch Assembly D37
Washer
Gear Drive/Gear Cam
Washer/Hook
Gear Sector
Hook
Brake Assembly Capstan Chassis Hole
Plate Slider
Chassis Guide

(1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position
(2) When disassembling, the Parts in the "Starting No."
column should be removed first."

4-1

Ref. Posi
Draw- tion
ings

A-1
A-2
A-2
A-2
A-2
A-2
A-2

T
T
T
T
T
T
T

A-3
A-3
A-3
A-3
A-3
A-4
A-4
A-4
A-5
A-5
A-5
A-5
A-6
A-6
A-6
A-6
A-7
A-7
A-7
A-7

T
T
T
T
T
T
T
T
T
T
T
T
B
B
B
B
B
B
B
B

28 Lever Tension

1 Hook

A7

B

29 Lever Spring

1 Hook

A-7

B

30 Lever Brake

1 Hook

A-7

B

31 Gear Assembly P2/
Gear Assembly P3
32 Base Assembly P2
/Base Assembly P3
33 Base Loading
34 Base Tension
35 Arm Assembly Idler Jog

Bass

A-8

B

6 Chasses

A-8

B

3 Hooks
Chassis Embossing
Locking Tab

A-8
A-9
A-9

B
T
T

T:Top, B:Bottom

NOTE : When reassembling, perform the
procedure in the reverse order.

Fixing Type

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Drum Assembly

Flat Cable

(S1)
(S1)

(S1)
Cap, FPC
H2

H1

Holder FPC

Fig. A-1
1. Disassembly of Drum Assembly
(Figure A-1)

Cautions in assembly of FPC

1) Separate the flat cable from the Drum FPC and the
Capstan Motor.
2) Release 3 screws (S1) on the bottom side of the chassis,
and separate the drum assembly.
3) Release the hooks (H1, H2) and separate both the holder
FPC and the Cap FPC (disassemble if necessary).

Cap FPC

Drum FPC
Holder FPC

Assembly shape seen in the reverse direction

4-2

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Plate Top

(Fig. A-2-1)

(B')

(C)

(B)

Holder Assembly CST

(Fig. A-2-2)
(E)
Arm Assembly F/L

(Fig. A-2-5)

Lever Assembly S/W

(Fig. A-2-6)
(H4)

(E)

Opener Door

(Fig. A-2-4)

(H3)

Gear Assembly Rack F/L

(Fig. A-2-3)

Fig. A-2
4-3

(A)

(B)

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
2. Disassembly of Plate Top (Fig. A-2-1)
1) Separate the right part while leaning back the (B) part of
the plate top toward the arrow direction.
2) Separate the left part while leaning back the (B’) part of
the plate top toward the arrow direction.
(Tool used: Tool such as (-) driver, auger, etc with pointed or flat end)

4. Disassembly of Gear Assembly
Rack F/L (Fig. A-2-3)
1) Separate the hook (H3) while leaning ahead the hook (3)
after moving the gear assembly rack F/L toward the arrow
(A) direction.
2) Separate the gear assembly rack F/L toward the arrow (B)
direction.

CAUTIONS

CAUTIONS
Assemble while pressing the (C), (C’) part after corresponding them as in drawing.

For the assembly, correspond the gear part of gear assembly rack F/L to the gear drive.
Gear Rack F/L

(C')
(C)
(B')

(B)

Gear Drive

5. Opener Door (Fig. A-2-4)
3. Holder Assembly CST (Fig. A-2-2)
1) Firstly separate the left part from the groove on the (D)
part of chassis while moving the holder assembly CST
toward the arrow direction.
Holder Assembly CST

Chassis

(D)

1) Separate the opener door ahead from the guide hole of
chassis while turning it clockwise.

6. Arm Assembly F/L (Fig. A-2-5)
1) Firstly separate the left part of the arm assembly F/L from
the groove of chassis while pushing the arm assembly F/L
toward the arrow direction.
2) Separate the right part from the groove of chassis.).

7. Lever Assembly S/W (Fig. A-2-6)
1) Separate the lever assembly S/W while pushing it toward
the arrow direction after removing the hook (4) on the left
side of chassis.
Chassis

2) Separate the right part from each groove of chassis

CAUTIONS
(H4)

Assemble by inserting the left part after firstly inserting the
(E) part of the holder assembly CST into the groove on the
(E’) part of chassis.

4-4

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Arm Assembly Cleaner

(Fig. A-3-3)
(A)
(H5)
Gear Wheel

(Fig. A-3-2)
Base Assembly A/C Head

Motor Assembly L/D

(S5)

(Fig. A-3-5)

(Fig. A-3-1)

(A)

Head F/E

(C1)

(Fig. A-3-4)

(S4)

Fig. A-3
8. Motor Assembly L/D (Fig. A-3-1)

10. Arm Assembly Cleaner (Fig. A-3-3)

1) Take the connector (C1) connected to the Capstan motor
PCB out.
2) Remove a screw (S4) of the chassis (S4) and step backward, and disassemble it while holding it up.

1) Separate the (A) part of Fig. A-3-1 from the embossing of
chassis, and hold it up while turning it anti-clockwise.

9. Gear Wheel (Fig. A-3-2)
1) Release the hook (H5) of the gear wheel and disassemble
it upward.

11. Head F/E (Fig. A-3-4)
1) Separate the (A) part of the head F/E from the embossing of chassis, and hold it up while turning it anti-clockwise.

12. Base Assembly A/C Head (Fig. A-3-5)
1) Release a screw (S5) and disassemble while holding it up.

4-5

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Arm Assembly Tension

(Fig. A-4-2)
(H7)

Reel T

(Fig. A-4-3)
Reel S

(Fig. A-4-3)

Spring Tension

Brake Assembly T

Spring Tension

(Fig. A-4-1)

(H8)

(H6)

Fig. A-4
13. Brake Assembly T (Fig. A-4-1)
1) Release the spring tension from the lever spring hook
(H6).
2) Disassemble the brake assembly T while holding it
upward.

15. Reel S/Reel T (Fig. A-4-3)
1) Disassemble the reel S/ reel T while holding it up (comparison between Reel S and Reel T)

14. Arm Assembly Tension (Fig. A-4-2)
1) Release the spring tension the hook (H7) from the arm
assembly tension.
2) After releasing the hook (H8) of the base tension, separate it while holding it up.

Reel S

Reel T

CAUTIONS
Spring used for both brake assembly T and arm assembly
tension is used (2EA used).

4-6

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM
Opener Lid

(Fig. A-5-2)

(B)
Arm Assembly Pinch

(Fig. A-5-3)
(C)

Base Assembly P4

(C)

(Fig. A-5-1)
(H9)

Arm T/up

(A)

(Fig. A-5-4)
Chassis

Fig. A-5
16. Base Assembly P4 (Fig. A-5-1)

18. Arm Assembly Pinch (Fig. A-5-3)

1) Release the (A) part of the base assembly P4 from the
embossing of chassis.
2) Hold the base assembly P4 up while turning it anti-clockwise.

1) Hold the arm assembly pinch up.

17. Opener Lid (Fig. A-5-2)
1) Release the (B) part of the opener lid from the embossing
of chassis.
2) Disassemble the opener lid upward while turning it anticlockwise.

19. Arm T/up (Fig. A-5-4)
1) Turn the arm T/up to release the anchor jaw (H9) part of
chassis and then hold it upward.

CAUTIONS
For the assembly, check the (C) part of the arm assembly
pinch is assembled as in drawing.
- REVERSE THE MECHANISM.

4-7

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Suppoter Capstan

(Fig. A-6-1)
Belt Capstan

(Fig. A-6-2)

Motor Capstan

(Fig. A-6-3)
Washer(W1)

Clutch Assembly D37

(Fig. A-6-5)

(L1)

(L1)

Lever F/R

(Fig. A-6-4)

Chassis

(S6)

Fig. A-6
20. Supporter, Capstan (Fig. A-6-1)

22. Lever F/R (Fig. A-6-4)

1) Turn the supporter and Capstan by 90 deg. clockwise
with a driver for disassembly.

1) Release the locking tab (L1) and then disassemble it
upward.

21. Belt Capstan (Fig. A-6-2) /
Motor Capstan (Fig. A-6-3)

23. Clutch Assembly D37 (Fig. A-6-5)

1) Separate the belt Capstan.
2) Undo 3 screws (S6) on the bottom side of chassis and disassemble it upward.

1) Remove the washer (W1) and then disassemble it
upward.

4-8

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

(H10)

(H11)
Gear

Gear Sector

Cam

(Fig. A-7-3)

(Fig. A-7-2)
(W2)

Washer (W2)
Brake Assembly Capstan

Gear Cam Hole(B)
(L2)

Gear Drive

(Fig. A-7-4)

(Fig. A-7-1)

Gear Drive Hole(A)

Plate Slider

(Fig. A-7-5)

Lever Tension

(Fig. A-7-6)
Lever Brack

(Fig. A-7-8)

(B)

Lever spring

(Fig. A-7-7)
Base Loading

Gear Cam Hole(C)

(A)

Chassis

Fig. A-7
24. Gear Drive (Fig. A-7-1)/
Gear Cam (Fig. A-7-2)

1) Release the locking tab (L2) on the bottom side of the
plate slider and then disassemble it upward.

1) Remove the washer (W2) and then disassemble the
gear drive.
2) Release the hook (H10) of the gear cam and then disassemble it upward.

27. Plate Slider (Fig. A-7-5)

CAUTIONS
For the assembly, adjust both the gear driver hole (A) and
the gear cam hole (B) straightly and then correspond the
gear cam hole (C) to the chassis hole.

25. Gear Sector (Fig. A-7-3)
1) Release the hook (H11) of the gear sector and then hold
the gear sector upward.

26. Brake Assembly Capstan (Fig. A-7-4)
4-9

1) Disassemble the plate slider while holding it up.

28. Lever Tension (Fig. A-7-6)
1) Release the lever tension from the guide (A) of chassis
while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.

29. Lever Spring (Fig. A-7-7)
1) Release the (B) part of the lever spring from the guide
(A) of chassis while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.

30. Lever Brake (Fig. A-7-8)
1) Disassemble the lever brake while holding it up.

DECK MECHANISM DISASSEMBLY
Gear assembly P2 Hole
Gear assembly P3 Hole

Gear Assembly P3

(Fig. A-8-2)

Gear Assembly P2

(Fig. A-8-1)
(H12)

(H13)

Lever Tension Boss
Plate slider Hole(B)
(H14)

Base Loading

(Fig. A-8-5)

(B)
(A)

Chassis

Base Assembly P3

(Fig. A-8-4)

Base Assembly P2

(Fig. A-8-3)

Fig. A-8
31. Gear Assembly P2 (Fig. A-8-1)/
Gear Assembly P3 (Fig. A-8-2)

32. Base Assembly P2 (Fig. A-8-3)/
Base Assembly P3 (Fig. A-8-4)

1) Hold the gear assembly P2 upward.
2) Hold the gear assembly P3 upward.

1) Disassemble the base assembly P2 downward while moving it toward the arrow (A) direction along with the guide
hole of chassis.
2) Disassemble the base assembly P2 downward while moving it toward the arrow (B) direction along with the guide
hole of chassis.

CAUTIONS
For the assembly, check the holes of both the gear assembly P2 and the P3 are adjusted straightly, and then correspond the gear section groove (A) to the plate slider hole (B).

33. Base Loading (Fig. A-8-5)
1) Release 3 hooks (H12, 13, 14) of the base loading, and
then disassemble them upward.
- Reverse the mechanism.

4-10

DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM

Base Tension

(Fig. A-9-1)

Arm Assembly Idler Jog

(A)

(Fig. A-9-2)

(B)

(C)

Chassis

(D)

Fig. A-9
34. Base Tension (Fig. A-9-1)

35. Arm assembly Idler Jog (Fig. A-9-2)

1) Release the (A) part of the base tension from the
embossing of chassis.
2) Hold the base tension upward while turning it anti-clockwise.

1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow
direction.
2) Disassemble the arm assembly idler upward.

CAUTIONS
Take care to ensure that the (D) part in the drawing is not
hung to chassis in disassembly.

4-11

DECK MECHANISM ADJUSTMENT
• Fixtures and Tools for Service

SR K

1. Cassette Torque Meter
SRK-VHT-303(Not SVC part)
Part No:D00-D006

-V

HT

-S

2. Alignment tape
Part No NTSC:DTN-0001
PAL:DTN-0002

3. Torque gauge
600g.Cm ATG
Part No:D00-D002

5. Post height adjusting driver
Part No:DTL-0005

6. + Type driver (ø5)

300
250
200
150

0 50

SR
K

VID
CAS EO
S
TOR ETTE
Q
MET UE
VHT ER
-303

-T
K- V HT0
SR
50
100
150

200

300

250

4. Torque gauge adaptor
Part No:D09-R001

4-12

DECK MECHANISM ADJUSTMENT
1. Mechanism Assembly Mode Check
Purpose of adjustment : To make tools normally operate by positioning tools accurately.
Fixtures and tools used
• Blank Tape (empty tape)

VCR (VCP) status

Checking Position

• Eject Mode
(with cassette withdrawn)

1) Turn the VCR on and take the tape out by pressing the
eject button.
2) Separate both top cover and plate top, and check both
the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-2).
3) If it is done as in the paragraph 2): Turn the gear cam as
in No.2) after mantling the motor assembly L/D.

• Mechanism and Mode Switch

4) Undo the screw fixing the deck and the main frame, and
separate the deck assembly. Check both the hole (A) of
gear cam and the hole (A’) of chassis correspond (Fig.
C-1).
5) Check the mode S/W on the main P.C. board locates at
a proper position as in (B) of the Fig. (C-1).
6) Connect the deck to the main P.C. board and perform all
types of test.

CHECK DIAGRAM
Mode S/W

Gear Cam

(C)

(B)

Gear Drive

Correspondence of the gear cam hole (O)
and the gear drive hole (O)

BOTTOM VIEW
Fig. C-1

Motor Assembly L/D

Gear Cam
(A')
(A)
Chassis Hole

TOP VIEW
Fig. C-2
4-13

Gear Cam Hole

DECK MECHANISM ADJUSTMENT
2. Previous Preparation for Deck Adjustment
(Preparation to load the VCR (VCP) with cassette tape not inserted)
1) Take the power cord from the consent.
2) Separate the top cover and the plate assembly top.
3) Insert the power cord into again.
4) Turn the VCR (VCP) on and load the cassette while pushing the lever stopper of the holder assembly CST backward. In this case, clog both holes on the housing
rail part of chassis to prevent detection of the end sensor.

If doing so, proceeding to the stop mode is done. In this
status, input signals of all modes can be received.
However, operation of the Rewind and the Review is
impossible since the take-up reel remains at stop status
and so cannot detect the reel pulse (however, possible for
several seconds).

3. Torque Measuring
Purpose of Measuring : To measure and check the reel torque on the take-up part and the
supply part that performs basic operation of the VCR (VCP) for
smoothly forwarding the tape.
Measure and check followings when the tape is not smoothly
wound or the tape velocity is abnormally proceeded:
Fixtures and tools used
• Torque Gauge
(600 g.cm ATG)
• Torque Gauge Adaptor
• Cassette Torque Meter
SRK-VHT-303

Item

VCR (VCP) status
• Play (FF) or Review
(REW) Mode

Mode

Measuring method
• Try to operate the VCR (VCP) per mode with the
tape not inserted (See ‘2. Prior Preparation for
Deck Adjustment).
• Measure after adhering and fixing the torque
gauge adaptor to the torque gauge (Fig. C-3-1)
• Read scale of the supply or take-up part of the
cassette torque meter (Fig. C-3-2).

Instruments

Reel Measured

Measuring Value

Fast forward Torque Fast Forward

Torque Gauge

Take-Up Reel

More than 400g°cm

Rewind Torque

Torque Gauge

Supply Reel

More than 400g°cm

Play Take-Up Torque Play

VHT-303

Take-Up Reel

40~100g°cm

Review Torque

VHT-303

Supply Reel

120~210g°cm

Rewind
Review

NOTE
Adhere the torque gauge adaptor to the torque gauge for measuring the value.

• Torque Gauge (600g.cm ATG)

• Cassette Torque Meter (SRK-VHT-303)

SR K

Torque Gauge
-V

HT

-S

300
250
200
150

SR

K

Torque Gauge
Adaptor

0 50

VID
C AS EO
S
T O R E T TE
Q
MET U E
VH T ER
-303

-T
K- V HT0
SR
50
100
150

200

300

250

Reel Table

Fig. C-3-1

Fig. C-3-2
4-14

DECK MECHANISM ADJUSTMENT
4. Guide Roller Height Adjustment
Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with
the tape lead line of the lower drum by constantly and adjusting
and maintaining the height of the tape.
4-1. Prior Adjustment
Fixtures and tools used
• Post Height Adjusting
Driver

VCR (VCP) status
• Play or Review Mode

Adjustment Procedure

Adjustment position
• The guide roller height adjusting screw on the
supply guide roller and the take-up guide roller
ADJUSTMENT DIAGRAM

1) Travel the tape and check the bottom surface of the
tape travels along with the guide line of the lower drum.
2) If the tape travels toward the lower part of guide line on
the lower drum, turn the guide roller height adjusting
screw to the left
3) If it travels to the upper part, turn it to the right.
4) Adjust the height of the guide roller to ensure that the
tape is guided on the guide line of the lower drum at the
inlet/outlet of the drum. (Fig. C-4-1)

GUIDE ROLLER
HEIGHT
ADJUSTMENT SCREW

Fig. C-4-1

4-2. Fine Adjustment
Fixtures and tools used
• Oscilloscope
• Standard test tape
• Post height adjusting
driver

Measuring tools and
connection position

VCR (VCP) status

• CH-1: PB RF Envelope • Play the standard test
tape.
• CH-2: NTSC : SW 30Hz
PAL : SW 25Hz
Waveform
• Head switching output
P2 POST ADJUSTMENT
point
• RF Envelope output
point

1) Play the standard test tape after connecting the probe of
oscilloscope to the RF envelope output point and the
head switching output point.
2) Tracking control (playback) : Locate it at the center
(Set the RF output to the maximum value via the tracking control when such adjustment is completed after the
drum assembly is replaced.)
3) Height adjusting screw: Flatten the RF waveform.
(Fig. C-4-2)
4) Move the tracking control (playback) to the right/left.
(Fig. C-4-3)
5) Check the start and the end of the RF output reduction
width are constant.

CAUTIONS

Adjustment position
• Guide roller height
adjusting screw

P3 POST ADJUSTMENT

Fig. C-4-2

When the tracking control
locates at the center.

Flatten the waveform by
lightly turning the
guide roller height adjustment screw.

When turning the tracking
control to both sides.

Fig. C-4-2
Connection Diagram

There must exist no crumpling and folding of the tape due
to excess adjustment or insufficient adjustment.

OSCILLOSCOPE

RF ENVELOPE OUTPUT POINT
CH-1

HEAD RF SWITCHING OUTPUT POINT

4-15

CH-2

DECK MECHANISM ADJUSTMENT
5. Audio/Control (A/C) Head Adjustment
Purpose of adjustment : To ensure that audio and control signals can be recorded and
played according to the contract tract by constantly maintaining
distance between tape and head, and tape tension between the P3
post and the P4 post.
5-1. Prior Adjustment (performed only when no audio output appears in play of the standard test tape)
Fixtures and tools used
• Blank Tape
(Empty Tape)
• Driver (+) Type ø 5

VCR (VCP) status
• Play the blank tape
(empty tape).

Adjustment Procedure/Adjustment Diagrams
1) Basically use the A/C head assembly adjusted as in
SPEC.
2) Check there is crumpling and folding of the tape around
the A/C head. If it is, Turn and adjust the tilt adjusting
screw to ensure that the tape corresponds to the bottom
guide of the P4, and recheck the tape path after proceeding play for 4-5 seconds.

Adjustment position
• Tilt adjusting screw (C)
• Height adjusting screw (B)
• Azimuth adjusting screw (A)
3) Where the tape bottom is not equal to Fig. C-5-3, Adjust
the height by using the height adjusting screw (B) and
then readjust it by using the tilt adjusting screw (C).

CAUTIONS
Always check the height of the A/C head since most ideal
height of A/C head can be obtained when the bottom part
of the tape is away 0.2 ~ 0.25mm from the bottom part of
the A/C head.

Tape

A/C Head

8.3

P4
Tape
0.2~0.25mm

A/C Head Base
Fig. C-5-1

Fig. C-5-3

X-Value Adjustment
Hole

Fixed Screw
Azimuth
Adjustment
Screw(A)

Tilt Adjustment
Screw(C)
Height Adjustment
Screw(B)

A/C Head Assembly
Fig. C-5-2
4-16

DECK MECHANISM ADJUSTMENT
5-2. Tape Path Check between Pinch Roller and
Take up Guide (Check in the Rev Mode)
1) Check the tape pass status between the pinch roller and
the take-up guide.(Check there is crumpling of the tape
pass and folding of the take-up guide.)
1) (1) When holding of the take-up guide bottom occurs
Turn the tilt adjusting screw (C) clockwise and travel it
stably to ensure there is no crumbling or folding of the
tape.
1) (2) When holding of the take-up guide top occurs
Turn the tilt adjusting screw (C) anti-clockwise and

travel it stably to ensure there is no crumbling or folding of the tape.
1) 2) Check there is folding of the tape at the bottom or top
of the take-up guide in cutting-off the REV mode

CAUTIONS
If the RF waveform is changed after adjusting the A/C head,
perform fine adjustment to ensure the RF waveform is flattened.

5-3. Fine Adjustment (Azimuth Adjustment)
Fixtures and tools used
• Oscilloscope
• Standard test tape
(only for SP)
• Driver (+) Type Ø 4

Connection position
• Audio Output Jack

VCR (VCP) status

Adjustment position

• Play the standard test
• Tape, 1KHz, 7KHz.

• Azimuth Adjusting
Screw (A)
• Height Adjusting Screw
(B)

Adjustment Procedure

1KHz

1) Connect the probe of Oscilloscope to the audio output
jack.
2) Ensure that Audio 1KHz, 7KHz output is flattened at the
maximization point by adjusting the Azimuth adjusting
screw (A).

7KHz

A: Maximum

B: Minimum

Fig. C-5-4

6. X-distance Adjustment
Purpose of adjustment : To maintain compatibility with other VCR (VCP).
Fixtures and tools used
• Oscilloscope
• Standard test tape
(only for SP)
• Driver (+) Type Ø 4

Connection position

VCR (VCP) status

Adjustment position

• CH-1: PB RF Envelope • Play the standard test
• CH-2: NTSC ; SW 30Hz
tape.
PAL:SW 25Hz
• Head switching output
point
• RF Envelope output
point

Adjustment Procedure
1) After releasing the auto tracking, lightly turn the fixing
screw. Turn the (+) type driver (Ø 3 ~ Ø 4) on the X-distance adjusting hole to the right or left. Adjust the RF
envelope level to the maximum point and then fix the fixing screws.
2) For the 31mm head, adjust it with the SP tape recorded
in the width of 31mm since the head travels on the tape
track only for SP with the width of 58mm.

Left

Grove of Base A/C

Right

Connection Diagram
X-distance Adjusting Hole
Fixing Screw
Azimuth
Adjustment
Screw(A)

Tilt Adjusting Screw (C)
Height Adjusting
Screw (B)

Fig. C-6

OSCILLOSCOPE

RF ENVELOPE OUTPUT POINT
CH-1

HEAD RF SWITCHING OUTPUT POINT

4-17

CH-2

DECK MECHANISM ADJUSTMENT
7. Adjustment after Drum Assembly (Video Heads)
Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc
depending on the guide roller after assembling the drum.
Fixtures and tools used
• Oscilloscope
• Standard test tape
(only for SP)
• Post Height Adjusting
Driver
• Driver (+) Type Ø 5

Connection position

VCR (VCP) status

Adjustment position

• CH-1: PB RF Envelope • Play the blank tape.
• CH-2: NTSC : SW 30Hz • Play the standard test
PAL:SW 25Hz
tape.
• Head switching output
point
• RF Envelope output
point

• Fine adjustment of
guide roller
• Switching Point
• Tracking Preset
• X-distance

Connection Diagram

Checking/Adjustment Procedure
1) Play the blank tape (empty tape) and check whether the
guide roller crumbles or wrinkles the tape and adjust it if
necessary.
2) Check that the RF envelope output waveform is flat, and
adjust the height of the guide roller while playing the
standard test tape.
3) Adjust the switching point.
4) Check the RF envelope output is the maximum when
the tracking control locates at the center. If not maximum, set up to ensure that RF envelope output
becomes the maximum by turning the (+) type driver (Ø
3 ~ Ø 4) on the base A/C groove.

OSCILLOSCOPE

RF ENVELOPE OUTPUT POINT
CH-1

CH-2

HEAD RF SWITCHING OUTPUT POINT

Waveform
V1/V MAX = 0.7
V1/V MAX = 0.8
V1
RF ENVELOPE OUTPUT

V1

V2

8. Check of Traveling Device after Deck Assembly
8-1. Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV
Fixtures and tools used
• Oscilloscope
• 6H 3KHz Color Bar
Standard Test tape
• Stop Watch

Measuring standard

Connection position

VCR (VCP) status

• RF Locking Time: Within • CH-1: PB RF Envelope
• CH-2: Audio output
5 seconds
• RF Envelope output
• Audio Locking Time :
point
Within 10 seconds
• Audio output jack

• Play the 6H 3KHz
Color Bar Standard
Test tape.

Checking Procedure
1) Check that locking time of the RF and Audio waveform is
fallen within the measuring standard in conversion of the
play mode from the CUE or the REV mode.

2) Readjust the paragraph 5 and 6 if it deviates from the
standard.

8-2. Check of Tape Curl and Jam Status
Fixtures and tools used
• T-160 Tape
• T-120 Tape

Fixtures and tools used

Fixtures and tools used

• There must be no jam or curl at the
first, middle and end position of tape.

• Travel the tape at the position
of its first and end.

Checking Procedure
1) Check there is no abnormality of every traveling post
status.
2) There must be no abnormal operation of the counter in

occurrence of folding of the bottom tape. There must be
not abnormality of audio signal in damage of the top tape.
3) If there is abnormality, readjust the adjustment paragraph 4 and 5.

4-18

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
1. Checking Points prior to Repair
Following abnormal phenomena may be repaired by
removal of foreign materials and oil supply. Check oiling is
required at the checking set or cleaning status is complete.
Determine that necessity of checking and repair the set
exists after checking the using period of the set together
with the user. In this case, followings must be checked:

Phenomena

Checking Points and
Cause

Replacement

Color beat

Pollution of Full-Erase Head

o

S/N, Color Faded

Pollution of Video Head

o

F/E Head

Video Head

Horizontal, Vertical Jitte

Pollution of Video Head or
Tape Transport System

o

Poor Sound, Low Sound

Pollution of Audio/Control
Head

o

No tape wound or tape
wound loosely.
Pollution of Pinch Roller or
FF or REW impossible, Belt Capstan Belt
or slow turning
Tape loosely wound in
REV or Unloading

Deterioration of Clutch
Assembly D37 Torque
Pollution of Drum and
Traveling Device

Fig. C-9-1 TOP VIEW
A/C Head

Pinch Roller

o

o

Belt Capston

Clutch
Assembly A37

Fig. C-9-3

CAUTIONS
If operation of the position with (O) mark is abnormal even
after removing cause, replace it with substitute product since
it shows damage or wearing.

Fig. C-9-2 BOTTOM VIEW

* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)
(6) Base Assembly
P3
(7) A/C Head

(3) F/E Head

(8) P4 Post
(5) Drum Assembly
(Video Head)

(10) Pinch Roller
(11) Take-up Guide
Post

(4) Base Assembly P2
(2) Tension Post

(9) Capstan Shaft

(1) Supply Reel

(12) Take-up Reel

Fig. C-9-3 Tape Transport System
4-19

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
2. Essential Check and Repair

4. Tools for Check and Repair

Recording density of the video is far higher than the audio.
Therefore video parts are very precise so as to allow only
error of 1/1000mm or so in order to maintain compatibility
with other videos.
If one of these parts is polluted or old, same phenomena will
appear as they are damaged.
To maintain clear screen, regular check, replacement of old
and damaged parts and oil supply, etc are essential.

(1) Grease: Floil G-3114 (KANTO) or equivalent grease
(Green)
(2) Grease: Kanto G-754, PL-433 (Yellow)
(3) Alcohol (Isopropyl Alcohol)
(4) Cleaning Patch (cloth)

3. Regular Check and Repair
Check and repair schedule is not constant since they vary
depending on method that the consumer uses video and
environment where the video is installed at.
However, for the video used by common household, good
screen will be maintained if regular check and repair per
1,000 hour is performed. The following chart shows relationship between using time and checking time:
Table 1
Time
Requiring
Checking

About
1 year

About
18 months

About
3 years

5. Maintenance Process
5-1) Removal of Foreign Material
(1) Removal of foreign material from video head (Fig. C-9-4)
Firstly try to use a cleaning tape.
(1) Use a cleaning patch if foreign materials are not removed
with the cleaning tape due to severe dirty of the head.
Soak the cleaning patch in alcohol and put it to the head
tip. Smoothly turn the drum (turning cylinder) to the right
or left (In this case, the cleaning patch must not be
moved vertically).
(1) After completely drying the head, test the traveling status
of the tape.
(1) If alcohol (Isopropyl Alcohol) remains at the video head,
the tape may be damaged when this solution touches
with the head surface.
Never use a cloth bar (commercial sale)

Average
hours used
per day

(2) Wipe the tape transport system and the drive system
with the cleaning patch soaked in alcohol (Isopropyl
Alcohol) when removing foreign materials from them.
1) The part touched with the traveling tape is called as
tape transport system. The drive system consists of
parts to travel the tape.
(2) 2) Care must be exercised so that unreasonable force
to change the pattern will be applied to the tape transport system during removal of foreign materials.

One hour

Two hours

Three hours

Drum
(Turning Cylinder)

Cleaning Patch
(Cloth)

Head Tip

Soak alcohol
(Isopropyl Alcohol).

Smoothly turn the drum (turning
cylinder) touching the soft surface
to the head tip surface.

Fig. C-9-4
4-20

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
5-2) Grease Applications
(1) Grease Application Method
Apply grease by using a cloth swab or brush. Care must
be exercised so that excess quantity should not be
used. If the excessive quantity is applied, wipe it with
the gauze soaked in alcohol (Isopropyl Alcohol).

NOTE: POSITION OF GREASE APPLICATION
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3
(3) Arm Pinch Shaft

(4) Gear Wheel Shaft
(5) Reel S. T. Shaft
(1) (2) (3) (4): KG-684G
(Green)
(5): PL-433 (Yellow)

(2) Regular Grease Application
Apply grease to the designated application position
every 500 hour.
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3 Coil
(3) Gear Cam Shaft
(4) Gear Drive Shaft
(5) Clutch Shaft Groove

(6) Guide Part on the Plate Slider
Side Wall (Left)
(7) Guide Part on the Plate Slider
Side Wall (Right)
(1) (2) (3) (4) (5) (6) (7): KG684G (Green)

2

2

1

4
1
3

3

4
6

5

7

Chassis (Bottom)
5

Chassis (TOP)
Gear Part
Cam Part
(PL-433.Yellow)

Gear Part
(PL-433.Yellow)

Gear Sector

Cam Part Side Application
(KG-684G.Green) Gear

Cam

Cam Part
(KG-684G , GREEN)

Cam Part
(KG-684G , GREEN)

Boss Part Side Wall
(PL-433.Yellow)

Gear Rack F/L
Gear Part Side Application
(PL-433.Yellow)

Base Loading

Gear Drive

Lever Tension Driving Cam Part
Lever, Brake Driving Cam Part

Gear Sector Driving Part

Inner Surface of
Guide Rail
(KG-684G.Green)
Lever F/R Driving Part
Side Wall Guide Part

Chassis (L)

4-21

Chassis (R)

Side Wall Guide Part
Lever, Spring Driving Part

Plate Slider

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
Lever, F/R, Base, Tension

GEAR AY, P2 & P3

PL-433
LEVER, F/R

BASE, TENSION

Clutch Contact Part
(PL-433, Yellow)
Tension Arm Party
Hinge Part (PL-433, Yellow)

4-22

MECHANISM TROUBLESHOOTING GUIDE
1.Deck Mechanism
A.
Auto REW doesn't work.

YES
Is the supply to the END sensor
END sensor "H"?
“H”: more than 3.5V
“L”: less than 0.7V~1V

YES

NO
Is the Vcc. voltage of End sensor 5V?

NO

Check the syscon power.

YES
Replace End sensor.

Is the voltage across IR LED
between 0.8~1.5V?

NO

Replace LED.

YES
Check syscon circuit.

B.
No F/R modes.

YES
Is the present mode, F/R
Mode?

NO

Is the mode SW assembled
correctly (refer to Pages 4-14.)

YES
NO
Does the Capstan Motor rotate?

YES
Does the T/Up, Supply Reel
rotate?

YES
Check syscon circuit.

4-23

Is the normal voltage supplied
to the Capstan Motor Vcc1,
Vcc2.?

YES
Is terminal voltage (Vctl) of
Capstan Motor supply side
more than 4V?

YES
Replace the Capstan Motor.

NO
Check Servo, Power Circuits.

MECHANISM TROUBLESHOOTING GUIDE
C.
AUTO STOP.
(PLAY/CUE/REV)
Check aligment positions (page
4-14) Check Pinch spring.
In Play/Cue/Rev is the pinch
roller in contact with the capstan shaft.

NO
Is the output of DFG, DPG OK?

YES
Are there T/up and supply reel
pulses.

Replace Drum Motor.

NO
YES
NO
Check Servo, Syscon.

YES
Check the Syscon, µ-COM.

Replace Reel Sensor.

D.
No cassette loading.

Insert the cassette.

YES
Does the lever Assembly S/W
work normally.

NO
Check CST Holder Assembly.

YES
Is there variation for CST IN
S/W Output?
(In Tape with REC Tab
“L”c"“H”"“L”)
(In Tape without REC Tab
“L”"“H”"“L”"“H”)

NO

Does the CST IN S/W work
normally?

NO
Replace CST IN S/W.

YES
YES
NO
Check Syscon Circuit.

Check Syscon Circuit.

4-24

MECHANISM TROUBLESHOOTING GUIDE
E.
In PB mode Tape Presence
not sensed.

Is the Pinch Roller attached to
the Capstan Motor Shaft?

NO

Check Alignment positions
(page 4-14)

YES
NO
Does the T/Up Reel turn?

NO
Is the Belt ok?

YES

Replace the Belt.

YES
Check the clutch and the Idler
Assembly.

Does the Capstan Motor turn?

YES
Does the Drum Motor turn?

NO

YES

Is the Voltage supplied to the
Capstan Motor Vcc1,Vcc2 each?

YES
Is the terminal voltage of
Capstan Motor supplied more
than 4V?

Are there DPG, DFG Pulses?

YES

NO
Check Servo, Power.

YES

Are the T/Up Supply Reel
Sensors ok?

Replace the Capstan Motor.

YES
NO
Check Servo, Syscon.

Is the Vcc voltage of the Drum
Motor normal?

NO
Check Syscon, Circuit.

YES
Is the terminal voltage of the
Drum Motor more than 2.3V?

YES
Replace the Drum Motor.

4-25

NO
Check Syscon, Circuit.

MECHANISM TROUBLESHOOTING GUIDE
2. Front Loading Mechanism
A.
Cassette cannot be inserted.
Does the Lever Assembly
Switch work?

NO

Is the Lever Assembly Switch
Spring damaged or omitted?

YES
YES

Does the CST IN Switch work
normally?

Is the Vcc of Main P.C.Board
5V?

NO

Replace or add the Lever
Assembly Switch Spring.

NO
Replace CST IN Switch.

YES
Check syscon circuit.

NO

YES

Is the voltage between cassette
switch and GND on Main
P.C.Board 5V??

Check power circuit.

NO

YES

Check Mode switch location
and syscon circuit.

Is there a short circuit between cassette switch
and GND on main P.C.Board?

NO

YES

Remove the short circuit part or
Replace the main P.C.Board.

Replace CST IN Switch.

B.
Cassette will not eject.

Does the L/D motor rotate in reverse?

NO

Check L/D Motor or Drive IC.

YES
Does the Lever Assembly Switch work?

NO
Replace lever Assembly Switch.

YES
NO
Does the F/L Arm Assembly work normally?

Replace F/L Arm Assembly .

YES
NO
Does the Door Opener work?

Replace the Door Opener.

4-26

MECHANISM TROUBLESHOOTING GUIDE
C.
Cassette will not load.

Does the CST insert?

YES
Does the CST insert?

YES

NO

Replace the Lid Opener.

Does the F/L Gear Rack work?

YES

NO

Does the Door Opener work?

YES

NO

Does the F/L Arm Assembly work?

YES

Check the power of L/D Motor.

NO

Replace the Front Loading Mechanism
Assembly.

4-27

Replace the F/L Arm Assembly.

NO

Does the Cassette Holder Assembly
move the F/L Arm Assembly?

YES

Is the Door opener assembled correctly?

NO

Does the L/D Motor work?

YES

Replace the F/L Rear Rack.

Is the Cassette Holder Assembly
assembled correctly?

EXPLODED VIEWS

1. Front Loading Mechanism Section

103

110

116

115

A24

105

112

113

106

102

100

114

032

107

A23

A21

109

054

A22

054A

4-28

EXPLODED VIEWS

2. Moving Mechanism Section (1)

OPTIONAL PART

031

079

011

017

022

032

A01

003

012

024

004

008

406

006

A03

409

007

013

016

014

015

009

405

027

026

028

031

029

021

4-29

EXPLODED VIEWS

3. Moving Mechanism Section (2)

518
055

060

051

080

056

058

052

061

052A

517

410

064

A11

067

077

066
065

032

068

070

069

023

A12

076

078

4-30

SECTION 5
RL-05 LOADER PART
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE ......................................................................................................5-2
WAVEFORMS .................................................................................................................................................................5-16
1. POWER & RESET SIGNAL .......................................................................................................................................5-16
2. MAIN CLOCK1 FOR IC202 (16.9MHZ)......................................................................................................................5-16
3. SDRAM CLOCK .........................................................................................................................................................5-17
4. TRAY OPEN/CLOSE SIGNAL 1.................................................................................................................................5-17
5. TRAY OPEN/CLOSE SIGNAL 2.................................................................................................................................5-18
6. SLED MOVE SIGNAL 1 .............................................................................................................................................5-18
7. SLED MOVE SIGNAL 2 .............................................................................................................................................5-19
8. FOCUS SEARCH SIGNAL.........................................................................................................................................5-19
9. LASER TURN ON SIGNAL ........................................................................................................................................5-20
10. DISC TYPE JUDGEMENT WAVEFORM (CD SERIES) ..........................................................................................5-21
11. DISC TYPE JUDGEMENT WAVEFORM (CD&CD-R)..............................................................................................5-21
12. DISC TYPE JUDGEMENT WAVEFORM (CD-RW)..................................................................................................5-22
13. DISC TYPE JUDGEMENT WAVEFORM (DVD SERIES) ........................................................................................5-22
14. DISC TYPE JUDGEMENT WAVEFORM (DVD_SINGLE&R) ..................................................................................5-23
15. DISC TYPE JUDGEMENT WAVEFORM (DVD _DUAL)..........................................................................................5-23
16. DISC TYPE JUDGEMENT WAVEFORM (DVDRW) ................................................................................................5-24
17. SPINDLE WAVEFORM1 ..........................................................................................................................................5-24
18. SPINDLE WAVEFORM2 ..........................................................................................................................................5-25
19. FOCUS ON SIGNAL(CD).........................................................................................................................................5-25
20. FOCUS ON SIGNAL(CD))........................................................................................................................................5-26
21. FOCUS ON SIGNAL(DVD) ......................................................................................................................................5-26
22. FOCUS ON SIGNAL (DVD) .....................................................................................................................................5-27
23. TRACK OFF SIGNAL(CD) .......................................................................................................................................5-27
24. TRACK OFF SIGNAL(DVD) .....................................................................................................................................5-28
25. TILT DRIVER SIGNAL(DISC READING) .................................................................................................................5-28
26. RF WAVEFORM(DVD) .............................................................................................................................................5-29
27. RF WAVEFORM(CD) ...............................................................................................................................................5-29
28. WOBBLE(DVD-R/RW)_READING ...........................................................................................................................5-30
29. WOBBLE(DVD+R/RW)_READING&WRITING =>X1 SPEED .................................................................................5-30
30. LD ENABLE(DVD) ....................................................................................................................................................5-31
31. LD ENABLE(CD) ......................................................................................................................................................5-31
32. LASER POWER(READING)_DVD+RW ...................................................................................................................5-32
33. LASER POWER(ERASE)_DVD+RW .......................................................................................................................5-32
34. LASER POWER(WRITING)_INITIAL STATE ...........................................................................................................5-33
35. LASER POWER(WRITING)_PROCESSING ...........................................................................................................5-33

THE DIFFERENCE OF DVD-R/RW, DVD+R/RW DISCS AND DVD-ROM ..............................................5-34
1. RECORDING LAYER .................................................................................................................................................5-34
2. DISC SPECIFICATION...............................................................................................................................................5-35
3. DISC MATERIALS ......................................................................................................................................................5-34
4. ORGANIZATION OF THE INNER DRIVE AREA, OUTER DRIVE AREA,
LEAD-IN ZONE AND LEAD-OUT ZONE....................................................................................................................5-39
5. ALPC(AUTOMATIC LASER POWER CONTROL) CIRCUIT .....................................................................................5-43

HOW TO USE TEST TOOL .......................................................................................................................................5-44
BLOCK DIAGRAMS ...................................................................................................................................................5-51
1.
2.
3.
4.

OVERALL BLOCK DIAGRAM ....................................................................................................................................5-51
DSP BLOCK DIAGRAM .............................................................................................................................................5-52
µ-COM BLOCK DIAGRAM .........................................................................................................................................5-53
RF BLOCK DIAGRAM................................................................................................................................................5-54

CIRCUIT DIAGRAMS ..................................................................................................................................................5-55
1. RF1 CIRCUIT DIAGRAM ..........................................................................................................................................5-55
2. DSP CIRCUIT DIAGRAM ...........................................................................................................................................5-57
3. µ-COM CIRCUIT DIAGRAM.......................................................................................................................................5-59

CIRCUIT VOLTAGE CHART .....................................................................................................................................5-61
PRINTED CIRCUIT DIAGRAMS ..............................................................................................................................5-63
1. MAIN P.C.BOARD .....................................................................................................................................................5-63
2. MAIN P.C.BOARD .....................................................................................................................................................5-65

ELECTRICAL TROUBLESHOOTING GUIDE
Reset or Power Check.

Check it after connecting the power cable
only for NO Reset or Power ON.

Are the pin 4, 1 of LCN202
+12V, +5V respectively after the power
cable connecting?

•Check the power(5V,12V)short.
•Check the power cable.
•Repair the power part.

NO

YES

Does the pin 3
of LIC303 change 0V to 3.3V
at the power supply initial
input mode?

NO

•Check the LIC505(3.3V reg.IC).
•Check the HRST signal of LIC301

NO

•Check the LX301
•Check the oscillation LIC302, LIC303

YES

Are the LX301 oscillating?
YES


•Is the pin 5 of LIC505 3.3V?
•Is the pin 4 of LIC505 1.5V?
YES


•1V(IREF):Check pin 112 of LIC301
•1.65V(REFIN):Check pin 134 of LIC301
•2.1V(REFI2):Check pin 12 of LIC201
•2.3V(REF01):Check pin 13 of LIC201
•2.3V(FPDVREF):Check pin 25 of LIC201
•3.3V(REFI):Check pin 38 of LIC201
•1.65V(REF02):Check pin 39 of LIC201

YES
OK

5-2

System Check

Load tray without inserting disc.

Does tray operate normally?

NO

Go to “Tray operating is abnormal”

YES
Does pick-up move to inside?

NO

Go to “Sled operating is abnormal”

YES
Does pick-up lens move
up/down?

NO

Go to “Focus Actuator operating is
abnormal”

YES
Does laser turn on?

NO

Go to “Laser operating is abnormal”

YES
After eject tray, Insert CD-ROM Disc
and check rotation

Does disc rotate
continuously and the drive recognize
the disc?

NO

Go to “Recognition fail Case1”
(CD-ROM Disc)

NO

Go to “Recognition fail Case2”
(DVD Disc)

NO

Go to “Recognition fail Case3”
(DVD±R/RW Disc)

YES
After eject tray, insert DVD Disc
and check rotation.

Does disc rotate
continuously and the drive recognize
the disc?
YES
After eject tray, Insert DVD±R/RW Disc
and check rotation

Does disc rotate
continuously and the drive recognize
the disc?
YES
OK

5-3

Tray operating is abnormal

Tray open doesn ’t work.

Is the
Input voltage 0V at LIC301
pin 60 when push the
EJECT SW?

NO

•Check the connection of LIC301 pin 106.
•Replace the EJECT SW.

NO

•Replace the LIC502.
•Check the communication line between
LIC502 and LIC301.

YES

Is there tray
control signal input?
(LIC502 pin46)
YES

Is there tray
drive voltage output?
(LIC502 pin 1, 2)

When LCN504 is open,
Is there tray drive signal
output?

NO

YES

YES

•Check the connector (LCN504).

5-4

Sled operating is abnormal

Is there sled
control signal output?
(LIC301 pin 126, 127)

NO

Replace the LIC301

YES

Is there
sled drive signal input?
(LIC502 pin 29, 30)

NO

•Replace the IC102.
•Check the LR532, LR533.

NO

Is DRV-CTRL1
signal “H”?
(LIC502 pin35)

YES

Is there
sled drive voltage output?
(LIC502 pin 37~40)

YES

YES

Replace the LIC502

Is there
sled drive voltage output?
(LCN501 pin 1,2,3,4)

YES

Replace the sled motor.

NO

Check the connection LCN501.

5-5

Spindle operating is abnormal

Is there
spindle control signal input?
(LIC502 pin 26)

Is there
spindle control DSP
output(LIC301 pin 123)?

NO

YES

NO

YES
•Replace the LIC301

Replace the LIC301.

Is there
spindle drive voltage output?
(LIC502 pin 11,13,16)

Is there
SFG signal input?
(LIC301 pin 53)

NO

NO

YES

YES

OK

Replace the Spindle Motor

•Replace the LIC102.

5-6

Focus Servo is unstable

Is FE signal
output normal in Focusing
Up/Down?
(LIC201 pin 87)

NO

Replace the LIC201.

YES

Is FDRV signal
output normal in Focusing
Up/Down?
(LIC301 pin 124)

NO

•Check the R534.
•Replace the LIC201.

YES
Go to “Focus Actuator
operating is abnormal”

Focus Actuator operating is abnormal.

Is there focus
search control signal input?
(LIC502 pin 5)

• Check the connection of LIC301 pin 124.
• Check the communication line between
LIC205 and LIC301.
• Replace the LIC205.

NO

YES

Is there focus
search drive voltage output?
(LIC502 pin 51,52)

Is DRV-CTRL1
signal “H”?
(LIC502 pin 35)

NO

YES

NO

YES
Replace the LIC502.

•Check the connection CN102 pin 40,41.
•Check the connector LCN201.

• Replace the IC301.
Replace the pick-up. After replacing Perform
5. Optical Power Setting from ‘How to use Test tool’.

5-7

Track Servo is unstable

Is TE signal
output normal in focusing
ON and tracking OFF?
(LIC201 pin 85)

Is pick-up
(E, F, G, H)output normal?
(LCN201 pin 5, 8, 9, 12)

NO

NO

YES

YES

Replace the LIC201.

•Check the pick-up FFC.
•Replace the pick-up.
•After replacing Perform 5. Optical Power Setting
from‘How to use Test tool’.

Is TE signal
input normal in focusing
ON and tracking OFF?
(LIC301 pin 133)

NO

Check the connection between
LIC301(pin133)and LIC201 pin 85.

YES

Is there TDRV
signal output in tracking ON?
(LIC301 pin 125)

NO

Replace the LIC301.

YES

Check the LIC502 and pick-up referring to
“Focus Actuator operating is abnormal”.

5-8

Recognition Fail Case 1:
CD-ROM Fail

Check pick-up read power
is 0.9~1.3mW?

NO

Go to “LD CHECK”.

YES

Does focus servo
operate normally?

NO

Go to “Focus Servo is unstable”.

YES

Check pick-up
RF signal LIC201(Pin113) is
500~1000mVpp?

NO

•Check the pick-up FFC and LCN201.
•Replace the pick-up unit.

YES

Check RFEQO waveform
(LIC201 Pin 95) is
800~1200mVpp?

NO

Replace the LIC201

YES

Check after replacing LIC301.
Is it OK?

NO

Go to “Tracking Servo is unstable”.

YES

OK

5-9

Recognition Fail Case 2:DVD Fail

Check pick-up read power
was 0.9~1.1mW?

NO

Go to “LD CHECK”.

YES
Is LIC201
pin 51(CD/DVD) level
was about 0V?

NO

Replace the LIC201.

YES
Is there
RF signal at LCN201pin 13,14.

NO

Replace the pick-up.

YES
Is there RF signal
at LIC201 pin 95.

NO

Replace the LIC201

YES

Check again after the
replace LIC201. Is it OK?

NO

Replace the LIC301.

YES
OK

Recognition Fail Case 3:
DVD±R/RW Fail

Is there AWOBBLE
(LIC201 pin 81)signal?

NO

Is there a wobble
(LIC301 pin 135)signal?

NO

YES
Replace the LIC301.

Replace the LIC201.

Check the connection between
LIC201 and LIC301.

5-10

LD CHECK
(Laser operating is abnormal)

Perform 6. Optical Power Setting parameter
check from‘How to use Test tool’.

Execute “C.Laser Power Setup”of
“How to use Test Tool”

Is ALPC parameters
valid?

Perform 4. LD Test check from
‘How to use Test tool’.

Check reference voltage.

OFF level

VRDC level &FPD

E

VWDC1 level &FPD

F

VWDC2 level &FPD

G

OK
FPD
VRDC
VWDC2
VWDC1

5-11

E

DVD
CD/DVD ?
CD

Select Mode: CD, Test and perform
Test from 4. LD Test of ‘How to use
Test tool’

Select Mode: DVD, Test and perform
Test from 4. LD Test of ‘How to use
Test tool’

Check the input of CD/DVD.
(pin 17 of LCN201 :‘H ’)

Check the input of CD/DVD.
(pin 17 of LCN201 :‘H ’)

Check the input of VRDC.
(pin 34 of LCN201)

Check the input of FPD.
(pin 19 of LCN201)

END

5-12

F

G

Select Mode: DVD, Test and perform
Test from 4. LD Test of ‘How to use
Test tool’

Select Mode: DVD, Test and perform
Test from 4. LD Test of ‘How to use
Test tool’

Check the input of CD/DVD.
(pin 17 of LCN201 : ‘L’)

Check the input of CD/DVD.
(pin 17 of LCN201 : ‘L’)

Check the input of VWDC.
(pin 36 of LCN201)

Check the input of VWDC.
(pin 36 of LCN201)

Check the input of recording pulse.
(pin 28, 29, 30, 31, 32, 33 of LCN201)

Check the input of recording pulse.
(pin 28, 29, 30, 31, 32, 33 of ILCN2018)

Check the input of FPD.
(pin 19 of LCN201)

Check the input of FPD.
(pin 19 of LCN201)

END

END

5-13

In case of writing fail.

Normal Case

Check the media
DVD ±R/RW?

NO

Check disc label.

YES

Does the disc
have any dust,scratch,
fingerprint …?

Finalized Disc?

Remove the dust,fingerprint and
if the disc has long width scratch,
change it.

YES

NO

Eject disc.

YES

If DVD ±R disc,use new DVD ± R disc.
If DVD ±RW disc,erase the disc.

Go to “Writing Part Check”.

5-14

Writing Part Check

Load tray with DVD ±R/RW disc.

Press the “REC” key.

Does writing finish
without any error?

NO

YES

Is the written file
read normally?

NO

Eject tray.

YES

Go to “LD CHECK”.

YES

Is the re-written file
read normally?
NO

OK
NO

Is SHAPCRE
input signal pulse?
(LIC01 pin 62)
YES

Check and replace the connection of
LIC301 pin 148.

Check and replace LIC201, LIC301.

5-15

WAVEFORMS
1. POWER & RESET Signal

12 V(LCN302 PIN4)

5V(LCN302 PIN 1)

/HRST(LIC303 PIN 3)
/SYSRST(LIC303 PIN2)

POWER IN

2. Main Clock1 for IC202 (16.9MHz)

LX301(LIC301 PIN 2)
GND LEVEL

5-16

3. SDRAM Clock

MCLK(LIC304 PIN 35)

4. TRAY OPEN/CLOSE SIGNAL 1

/EJECT-KEY (LR504)

TRAY-CTRL
(LIC502 PIN46)

TRAY+(LCN504 PIN 3)

TRAY-(LCN504 PIN 4)

CLOSE

OPEN

5-17

5. TRAY OPEN/CLOSE SIGNAL 2

/EJECT-KEY(LR504)

TRAY-CTRL(LIC502 PIN46)

/OPEN-SW(LCN504 PIN 1)
/LOAD-SW
(LCN504 PIN 2)

CLOSE

OPEN

6. SLED MOVE SIGNAL 1

SDRV2(LIC502 PIN31)

SDRV1(LIC107 PIN29)

A+(LCN501PIN 2)

A-(LCN1501 PIN 1)

ZOOM

5-18

7. SLED MOVE SIGNAL 2

SDRV2(LIC502 PIN31)
SDRV1(LIC107 PIN29)

A+(LCN501PIN 2)

A-(LCN1501 PIN 1)

8. FOCUS SEARCH SIGNAL

FDRV (LIC502 PIN 5)

F+ (LIC502 PIN 52)

F- (LIC502 PIN 51)

5-19

9. LASER TURN ON SIGNAL

F+ (LIC502 PIN 52)

LDEN-DVD(LCN201 PIN17)

VRDC(LCN201PIN 34)

5-20

10. DISC TYPE JUDGEMENT WAVEFORM (CD SERIES)

FDRV(LIC502 PIN 5)
FE(LIC201 PIN87)

TE(LIC201 PIN85)
RF(LIC201PIN 113)

11. DISC TYPE JUDGEMENT WAVEFORM (CD&CD-R)

FDRV(LIC502 PIN 5)

FE(LIC201 PIN87)

TE(LIC201 PIN85)
RF(LIC201PIN 113)

5-21

12. DISC TYPE JUDGEMENT WAVEFORM (CD-RW)

FDRV(LIC502 PIN 5)

FE(LIC201 PIN87)

TE(LIC201 PIN85)

RF(LIC201PIN 113)

13. DISC TYPE JUDGEMENT WAVEFORM (DVD SERIES)

FDRV(LIC502 PIN 5)

FE(LIC201 PIN87)

TE(LIC201 PIN85)
RF(LIC201PIN 113)

5-22

14. DISC TYPE JUDGEMENT WAVEFORM (DVD_SINGLE&R)

FDRV(LIC502 PIN 5)

FE(LIC201 PIN87)

TE(LIC201 PIN85)
RF(LIC201PIN 113)

15. DISC TYPE JUDGEMENT WAVEFORM (DVD _DUAL)

FDRV(LIC502 PIN 5)

FE(LIC201 PIN87)

TE(LIC201 PIN85)
RF(LIC201PIN 113)

5-23

16. DISC TYPE JUDGEMENT WAVEFORM (DVDRW)

FDRV(LIC502 PIN 5)
FE(LIC201 PIN87)
TE(LIC201 PIN85)

RF(LIC201PIN 113)

17. SPINDLE WAVEFORM1

MDRV (LIC502 PIN 26)
REFOUT (LIC502 PIN 42)

SFG((LIC502 PIN43)

5-24

18. SPINDLE WAVEFORM2

U((LIC502 PIN11)

V((LIC502 PIN13)

W((LIC502 PIN16)

SFG(LIC502 PIN43)

19. FOCUS ON SIGNAL(CD)

FDRV (LIC301 PIN 124)

FE (LIC201 PIN87)
TDRV (LIC301 PIN 125)

TE (LIC201 PIN85)

5-25

20. FOCUS ON SIGNAL(CD)

FDRV (LIC301 PIN 124)
FE (LIC201 PIN87)

TDRV (LIC301 PIN 125)

TE (LIC201 PIN85)

21. FOCUS ON SIGNAL(DVD)

FDRV (LIC301 PIN 124)

FE (LIC201 PIN87)
TDRV (LIC301 PIN 125)

TE (LIC201 PIN85)

5-26

22. FOCUS ON SIGNAL (DVD)

FDRV (LIC301 PIN 124)
FE (LIC201 PIN87)

TDRV (LIC301 PIN 125)

TE (LIC201 PIN85)

23. TRACK OFF SIGNAL(CD)

TE (LIC106 PIN85)

TZC(LIC106 PIN74)

MIRRBCA(LIC106 PIN77)

5-27

24. TRACK OFF SIGNAL(DVD)

TE (LIC106 PIN85)

TZC(LIC106 PIN74)

MIRRBCA(LIC106 PIN77)

25. Tilt Driver signal(Disc reading)

TILTDRV(LIC502 PIN47)

TILT+(LIC502 PIN50)

TILT-(LIC502 PIN49)

5-28

26. RF WAVEFORM(DVD)

RFP(LIC201 PIN2)

RFO(LIC201PIN 113)

RFI(LIC201 PIN 95)

27. RF WAVEFORM(CD)

RFP(LIC201 PIN2)

RFO(LIC201PIN 113)

RFI(LIC201 PIN 95)

5-29

28. WOBBLE(DVD-R/RW)_READING

AWOBBLE(LIC201 PIN81)

LPP/HEAD(LIC201 PIN 73)

29. WOBBLE(DVD+R/RW)_READING& WRITING => X1 SPEED

AWOBBLE(LIC201 PIN81)

LPP/HEAD(LIC201PIN 73)

5-30

30. LD Enable(DVD)

CD/DVD(LCN201 PIN 17)

LDEN(LCN PIN 38)

31. LD Enable(CD)

CD/DVD(LCN201 PIN 17)

LDEN(LCN102 PIN 38)

5-31

32. Laser Power(reading) _ DVD+RW

VRDC(LCN201 PIN 34)

VWDC(LCN201 PIN 36)

VWDC2(LCN201 PIN 35)

OPCTRG(LIC301 PIN 151)

33. Laser Power(Erase) _ DVD+RW

VRDC(LCN201 PIN 34)

VWDC(LCN201 PIN 36)

VWDC2(LCN201 PIN 35)

OPCTRG(LIC301 PIN 151)

5-32

34. Laser Power(Writing) _ initial state

VRDC(LCN201 PIN 34)

VWDC(LCN201 PIN 36)

VWDC2(LCN102 PIN 35)

OPCTRG(LIC301 PIN 151)

35.Laser Power(Writing)_Processing

VRDC(LCN201 PIN 34)

VWDC(LCN201 PIN 36)

VWDC2(LCN201 PIN 35)

5-33

The difference of DVD-R/RW, DVD+R/RW discs and DVD-ROM
1. Recording Layer
• DVD-ROM (Read Only Disc)

4
0.7

um

3T

0.4 um

• DVD+R/RW Disc

5-34

2. Disc Specification

3. Disc Materials
1) DVD-ROM
< Single Layer >

< Dual Layer >

5-35

2) Recording format using organic dye material
( DVD-R / DVD+R )
The format that records data through the creation of recorded marks by changing the organic dye material with a
laser beam.
G

Disc structure

G

Recording principles

[ Recording ]
Recording is done by changing the organic dye layer and the substrate with a laser When a strong laser is applied
to a disc, the temperature of the organic dye material goes up, the dye is decomposed and the substrate changes
at the same time. At this time, a durable bit is created as is the case with a CD-ROM.
[ Playback ]
Signals are read with the differences of the reflection of a laser from pits.

5-36

3) Recording format using phase-change recording material
( DVD-RW / DVD+RW )
• Data is recorded by changing the recording layer from the amorphous status to the crystalline status, and played
back by reading the difference of the reflection coefficient.
Amorphous: Non-crystalline.
G

Disc structure

G

Recording principles

[ Recording ]
When a high-power laser is applied to the recording material, it melts and then becomes amorphous with a low
reflection coefficient when it quickly cools off. When a mid-power laser is applied to heat gradually the recording
material and then gradually cools it off, it becomes crystal with a high reflection coefficient.
[ Playback ]
A low-power laser is used for playback. The amount of reflected light depends on the status (amorphous or crystalline) of the recording material. This is detected by an optical sensor.

5-37

To make recordings, it is necessary to modulate the write pulse, which is called “Write Strategy”.
There can be many types in Write Strategy. Typically Write Strategy for DVD ±R has NMP(Non Multi-Pulse) type and
MP(Multi-Pulse) type. In NMP type each single mark is created by subsequent separated short pulses. In MP type each
single mark is created by one continuous pulse.
Write Strategy for DVD ±RW has Type 1 and Type2. In Type 1 the mark with nT width is created by one top pulse and (n-2)
multi-pulses. Thus mark 3T is made by one top pulse and one multi-pulse. In Type 2 the mark with nT width is created by
one top pulse and (n-3) multi-pulses. Thus mark 3T is made by one top pulse only.
RL-02A uses MP type Write Strategy for DVD ±R and Type 1 for DVD ±RW as shown below.

Recording data

Twd ( 8T )

Twd (3T )

Ttop

Write pulse
for DVD R

Ttop
Tmp

Po
Pb
Zero Level
Write pulse
for DVD RW

Ttop

Tmp
Tcl

Pe Po
Zero Level

Pb

Po :Write Power (Peak Power)
Pe :Erase Power
Pb :Bias Power

5-38

Ttop

Tmp
Tcl

4. Organization of the Inner Drive Area, Outer Drive Area, Lead-in Zone
and Lead-out Zone
1) Layout of DVD-ROM disc
Disc Center

Diameter 120 mm
Diameter 44mm

Diameter 33mm
Diameter 22mm
Diameter 16mm
Diameter 15mm
Clamping
Zone

Center
hole

3th transition
area

1th transition area
2th transition area

Inform ation Zone
Rim
area

Read Only Disc

Lead-in Zone

Data Zone

Lead-out Zone

2) Layout of DVD+R disc
Disc Center

Diameter 120 mm
Diameter 44mm

Diameter 33mm
Diameter 22mm
Diameter 16mm
Diameter 15mm
Center
hole

Clamping
Zone

3th transition
area

Inform ation Zone

1th transition area
2th transition area

Rim
area

Unrecorded Disc
In ner Drive
Area

Inner Disc
Test Zone

Lead-in
Zone

Lead-out Outer Drive
Area
Zone

Data Zone

Outer Disc Outer Disc
Test Zone Count Zone

Inner Disc
Count Zone

out

in
PSN : 23080H 27080H 27480H 28480H 2A480H 30000H

260540H

261940H
262940H

263940H

Inner Disc Test Zone : fo r performing OPC procedures.
Inner Disc Count Zone : For counting the number of OPC algorithm performed in IDT Zone.
Outer Disc Test Zone : for performing OPC procedures.
Outer Disc Count Zone : For counting t he number of OPC algorithm perf ormed in IDT Zone.

5-39

267940H

3) Layout of DVD+RW disc
Disc Center

Diameter 120 mm
Diameter 44mm

Diameter 33mm
Diameter 22mm
Diameter 16mm
Diameter 15mm
Center
hole

Clamping
Zone

3th transition
area

Inform ation Zone

1th transition area
2th transition area

Rim
area

Unrecorded Disc
Lead-in Zone

Data Zone

Lead-out Zone

Outer Disc Outer Disc
Test Zone Count Zone

Inner Disc Inner Disc
Test Zone Count Zone

out

in
PSN : 2A480H

2A7C80H

2DC80H

260540H 262940H

30000H

265940H

Inner Disc Test Zone : fo r performing OPC procedures.
Inner Disc Count Zone : For counting the number of OPC algorithm performed in IDT Zone.
Outer Disc Test Zone : for performing OPC procedures.
Outer Disc Count Zone : For counting t he number of OPC algorithm perf ormed in IDT Zone.

5-40

266140H

4) Layout of DVD-R/RW disc
Disc Center

Diameter 120 mm
Diameter 44mm

Diameter 33mm
Diameter 22mm
Diameter 16mm
Diameter 15mm
Center
hole

Clamping
Area

3th transition
area

1th transition area
2th transition area
R-Information
Area

Rim
area

Inform ation Area

Lead-in
Area

PCA
(Power Calibration
Area)

Unrecorded Disc

Data Recordable Area

RMA
(Recording
Management Area)

in
1E800H

203B0H 203C0H

22F90H 22FA0H

PSN :

5-41

30000H

Lead-out
Area

5. ALPC(Automatic Laser Power Control) Circuit
1) Block Diagram

IC 106 ( uPC3330 )
RLDON
51

CN 102
S/H &
VR DCG

IC 201

SHAPCRE
62

160

+

28

37

Optical
Pick-up

VRDC
DAC
& Gain

-

RLD

VRDC

‘H’

VR DC_
DAC

HOP-7521T
FPDVC
18

uPD63630

FPDVREF
25

FPD
19

PDIN

Write
Strategy

24

Write
S/H Signal

VWDC1 _
DAC
WLD
32

VWDC1
DAC
& Gain

-

LD
LD
Dr
Drive
ive

+

VWDC
34

SHAPCW
S/H &
VWDC1G

159

63
WLDON
58

VWDC2
35

PE LD
34

166

VWDC2_
DAC

2) ALPC(Automatic Laser Power Control) Circuit Operation
ALPC function in CD-R/RW,DVD+R/RW analog front-end is for constant power level control purpose.
Based on the accurate power sensor(FPD) in OPU, ALPC feedback loop maintains constant power level against
laser diode’s temperature variation.
There are two power control loops in uPC3330, which are used with different combination for different applications.
Generally, the first ALPC loop is used for read-power control. The 2nd ALPC loop is used for write(erase) power
control for CD-R/RW and DVD+R/RW disc.
Owing to the small signal level in read-power control mode, the first ALPC loop amplifies the FPD signal to enhance
the accuracy of read power control. The built-in 10-bit DAC(VRDC_DAC) is used to set the read power level.
Moreover, the 2nd ALPC loop is used for high power control. The built-in 10-bit DAC(VWDC1_DAC) is used to set
the wanted power level.
And the register VWDC1G is employed to adjust the gain of FPD signal.
The following potentiometers(VRDC_DAC, VWDC1_DAC, and VWDC2_DAC) and amplifiers (VRDCG and
VWDC1G) are used to set the wanted levels of the output pins RLD, WLD, and PELD

5-42

How to use test tool
1. ALPC Measurement System Configuration
In order to measure and adjust DVD RW optical power, The following measurement equipments are needed.
N

Compulsory equipment
➀ Optical Power meter & Sensor (ADVANTEST, TQ8210/Q82017A or equivalent
➁ Personal Computer (Pentium 3, 500MHz Above, , RAM:64M Above, Win98 Above)
➂ Adjustment Program (Dragon or ALPC) for SVC, ALPC Program recommended

N

Fl optional equipment
➀USB-ATAPI Interface (needed when using USB Port from the laptop computer without ATAPI interface or a desktop
computer)
➁Connector-ATAPI Interface Board(Part Mo:6881R-7677A) (needed when ATAPI is not attached to Loader)

USB-ATAPI Interface

Personal Computer
(Desktop or Notebook)

Optical
Power Meter

Loader Ass’y
Connector-ATAPI Interface Board

5-43

2. ALPC Program Configuration
ALPC Program consists of total 4 files.
ALPC.exe
LgBada.dll
modelnm.txt
WNASPI32.DLL
These 4 files should be located in one directory.
ALPC.exe is a program execution file.
modelmn.txt is a configuration file.

Determine how to connect
The following contents are included when you open "modelnm.txt" file.
The following contents are included when you open LGE connect=0
connect=0 is the item which you can determine whether you use Serial or ATAPI.
0 : ATAPI
1 : Serial
Thus, select connect=0 to use ATAPI, or select connect=1 to use Serial, then save the file.
(For SVC, ATAPI setting is recommended.)

5-44

3. Running ALPC Program
When running ALPC.exe file, the following screen appears.

CD/DVD
Selection

ALPC Setup or LD
Test Selection

Display what is selected
in modelnm.txt

Result output
window
Laser Power
Setup window

Laser Read
Power On

Laser Write
Power
On

Laser off

5-45

Used When inputting
to EFROM after Lser
power measurement

When Laser
Power Test

EEPROM
Data output

4 LD Test
* Test DVD LD

* Test DVD CD

➀ Select DVD mode
➁ Select Test mode
➂ Click
Test

➀ Select CD mode
➁ Select Test mode
➂ Click
Test

Section

Off

VRDC

VR_FPD

CD

2.4±0.08

0.53±0.22

0.02±0.01

DVD

2.4±0.08

0.7±0.2

0.04±0.01

VWDC1

VW_FPD

VW2-1

VW2-2

0.43±0.05

0.2±0.02

0.08±0.02

0.2±0.03

Test result output when
All OK, OK

Specification can be changed according to pick-up type, circuit, program, and chipset.
If specifiction is changed, program can be sent by supervisor.
Specification above is temporary reference.

5-46

5. Optical Power Setting
When replacing Travers ass’y including Pick-up or Loader PCB, Optical Power Setting should be performed for Pick-up
and Loading PCB’s matching.
➀ DVD LD optocal Power Setting
• Select DVD and Setup mode
• Push
. (Read Power On. Strong Red light can be seen from pick up optical lens.)
• Measure optical power.
• Write measurement value in Read Power.
• Push
. (Write power On.) (Caution) Light is very strong. Never look at the light directly.
• Measure optical power
• Write measurement value in Read Power and push LD off
.
• Push
. (Measurement value is inputted to EEPROM)
➁ DVD LD optocal Power Setting
• Select CD and Setup mode
• Push
. (Read Power On. Weak Red light can be seen from pick up optical lens.)
• Measure optical power.
• Write measurement value in Read Power.
• Push
. (Write power On. Weak Red light can be seen.)
• Measure optical power and push LD off
.
• Write measurement value in Read Power.
• Push
. (Measurement value is inputted to EEPROM)

5-47

6. Optical Power Setting Parameter Check
Use when defective happens even though LD test result is normal.
When defective can be found but power test result is OK, You need to check current settings whether they are proper or
not. In this case, Pressing
will display ALPC Parameter Info window and show current optical power settings
recorded in EEPROM(IC302).
Write down these settings on the paper, perform optical power setting and press
again, then new optical power settings will appear. Compare these two parameters. If there is a big difference, optical power setting may have been wrong at
first or pick-up optical output may have been changed. If pick-up is normal, problem can be solved by resetting optical
power without replacing pick-up.
In order to remove previous ALPC Parameter from ALPC Parameter Info, press
Info window.

5-48

at the bottom of ALPC Parameter

[VALID ALPC Parameters]


1) CD-R READ Reference DAC
2) CD-RW READ Reference DAC


: 70 ~ 100
: 70 ~ 100

1)
2)
3)
4)
5)
6)

5-49

DVD-R READ Reference DAC
DVD-RW READ Reference DAC
VWDC1
VWDC1 Offset
VWDC2
VWDC2 Offset

:
:
:
:
:
:

42 ~ 107
42 ~ 107
35 ~ 65
0~6
20 ~ 43
0 ~ 10

Appendix. How to measure optical power
Optical power measurement is measuring actual optical power coming out from an object lens with LD turned on.
thus, In order to measure optical power, LD should to be turned on and environment need to be dark enough.
If necessary, Cover the top side of the sensor with black paper or hand when measuring.
Generally, fluorecent light is about 50 µW, sun light is about 100 mW. so, If this is ignored, optical power setting may not be
set correctly.
Optical power mesurement procedure
1. Adjust optical power meter’s λ(wave length) to DVD. (Generally 660 nm)
2. Turn DVD LD on.
3. Place sensor less than 3mm apart from pick-up object lens, perpendicular to lens.
Adjust position so that the center of object lens match to L mark on the sensor.
4. Read monitor’s value. (Read Maximum value as moving position slightly)
(Check working unit. Unit should be mW. When LD is dead, µW or nW unit may not be read correctly.)
5. Multiply monitor’s value by 100, round off to the nearest integer, then write constant part.
6. Adjust optical power meter’s λ (wave length) to CD. (Generally 780 nm)
7. Turn CD LD on.
8. Repeat step 3~5 above.

L

5-50

Display Part

5-51

12V

5V

LIC301
uPD63641

LIC502
BD7954BFS
Motor Driv er

LIC201
uPC3340

VC(42)

REFI2(12)

REFO1(13)

REFI (38)

REFO2 (39)

REFIN(134)

PDVC
(2.1V)

3.3V

REFOUT/1.65V

5V

LIC203
XC6206P

FPDVC(2.4V)
PDVC

VDD(LDD)

VCC(OEIC)

VCC(FM)

VREF(18)
VC(OEIC)(3)

PICKPICK-UP

1.5V

1.5V

D:25,85,138,186
A:120,179

11,30,40,45,57,89,98,111,114

RST(52)

SYSRST(16)

HRESET(52)

3.3V

3.3V

REFOUT/1.65V

HRST

LIC303

D:21,44,70,89,152
A:6,119,130,171,181

LIC505
BA3258HFP

5V

HRST

LCN302
ATAPI

12V

BLOCK DIAGRAMS

1. OVERALL BLOCK DIAGRAM

PRE-AMP

PD IC

FPD IC

FPD

CD

E1

E2

E3

B

E4

D
C

F2

F3

A

F1

INV.

F4

DVD

INS (H:LVDS,L: TTL)

OSC

F=315MHz
(260~360)

READ CHANNEL
150mA

325mA

AADJ2

LD
2

WRITE CHANNEL 1

250mA

WRITE CHANNEL 2

AADJ1

36

W1 SET

10K

30

W2 DISN

17

21

22

27

FM
19

3

VC(OEIC)

GND(OEIC)

1

VCC(OEIC) 2

4

GAIN SW

5

12

RF(+) 13

RF(-) 14

V.REF 18
(FPDVC)

AMP

GND(FM) 20

E2F2/C/A/E1F1
E4F4/D/B/E3F3

2

37
38

VCC(FM) 16

CD SEL

OSC ENA

RDIS

R SET

32

31

W2 DIS

33

35

W2 SET

W1 DIS

28

W1 DISN

29

W3 DIS
W3 DISN

FADJ1

150mA

FADJ2

-

34

ENABLE

VWDC

VWDC2

VRDC

WRPULSEM

WRPULSEP

PKPULSE1M

PKPULSE1 P

OFPULSEM

OFPULSEP

TEMP

10K

270K
1000pF

RLD
RLDM

WLD
WLDM

MON2
(TEMP IN)

RFP/RFN
A~D

118

MON3
(F-JH)

13~17 E~H

7~10

2,3

120 MON1(FPD)

ëLí

ëHí

DAC

&

LIC201
uPC3340
RF

DAC

51 CD/DVD

119

71 LDEN

33

32

34 PELD

29

28

LIC205
NC7SB3157

10K, 0.01uF

L.P.F

47K, 1000PF

L.P.F

2200PF

1.0M

1000PF

2700PF

1.0M

LIC301
uPD63641
DSP & MICOM

LIC204

FILT

BUF

LIC204

680

1.2K

1.2K

115 SWRF1

W3 SET

153 PDGCTRL

LD
1

+
FDRV 124

5-52
L.P.F

&

58 WLDON
WLDON(WGATE) 153

+

WRITE CHANNEL 3

OSCEN 174

+

WRPULSEM168

+

LD DRIVER

2. DSP BLOCK DIAGRAM

LIC202
KIC7W08FK
WR/RE 174
OFPULSEM 173

OFPULSEP 172
PKPULSE1M164

PKPULSE1P 163

WRPULSEP167

5-53

AGC

AL PC

RFEQ

MIRR/DEFF

WOBBLE
LPP

FE.

TE
TE SIG SEL

WRITE RF

CONTROL
LOGIC

ASY/BCA/FOK/ DETECTION

Read RF

S/H
MATRIX

(RF)

LIC201
uPC3340
CP, SCK, SI, SO

/EPRCS, SI, SO, SCLK

(DSP & MICOM)

AWOBBLE,LPP

MIRR/BCA

RECD, FOK

WLDON(WGATE*WR/RW)

OPCTRG, SHAPCRE,SHAPCW

RFI

SHSV,SHWB

HOLD

LIC301
uPD63641

FA[0:15]

FE.

TE,LE(PPALL),TEC

ROPC1, ROPC2

SWRF1,SWRF2

EQCK1, EQCK2

/FRD
/FWR
/FCS0

FD[0: 15]

FRONT SW.

LQ302
LQ301

EFM
ASY
LLOCK
FCEFM1

/FWR

/FCS2

FD[0,1,4,5,6,7]

LIC502
BD7954BFS
(Motor Driv er)

CP

SWLLOCK,SWFCEFM

Q[4,7]

LIC504
74LVC374
(D F/F)
Q[0,1]

D[0:7]

Q[5,6]

DRV_CTRL0,1

ASY1.2

SDRV1, SDRV2, SFG

MDRV, FDRV, TDRV
SDRV1, SDRV2, Ti/TRV

HDD[0:1 5]
/DIOW,/DIOR, /HDMACK, PDIAG
HDMARQ, IORDY, HINTRQ,/HIOCS16
HAD[0:2], /HCS0, /HCS1,/DASP,HRESET

/LOAD SW, /OPEN SW,/EJECT KEY

/CAS, /RAS
LDQM, UDQM
/WE, /CAS, /RAS
MCLK, MCKE

LIC304
SDRAM(16M)

MA[0:15]

LIC501
FLASH(16M)

MD[0:1 5]

LIC302
E2PROM

3. µ-COM BLOCK DIAGRAM

ATAPI

TRAY(+)

5-54

(DSP & MICOM)

uPD63641

Ti-Tr DRV

Level Shift

TRAY(-)

L/M
HU,HV,HW

SFG

FG gen.

V
W

MDRV

Rev. Det

PRE LOGIC

U

U,V,W

SPINDLE
MOTOR

L.Shift

F+.-

TDRV FDRV

L.Shift

TRK+.-

L.Shift

TILT+,B+

PRE LOGIC

A-

B-

PD
PD

CTL0 CTL1
L
L
H
L
-H

ALL NOT OPER.
LOADING
SPIN/SLAD/ACTU

SDRV1 SDRV2

A+

SLED MOTOR

PickPick-up

LD
LD
Driver
Driver

BD7954BFS
(Motor Driver)

74LVC374
(D F/F)

CTL0

MECHA

CTL1

Disc

4. RF BLOCK DIAGRAM

CIRCUIT DIAGRAMS
1. RF CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

5-55

J

K

L

5-56

M

N

O

P

Q

R

S

T

2. DSP CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

5-57

J

K

L

5-58

M

N

O

P

Q

R

S

T

3. µ-COM CIRCUIT DIAGRAM

A

B

C

D

E

F

G

H

I

5-59

J

K

L

5-60

M

N

O

P

Q

R

S

T

CIRCUIT VOLTAGE CHART
MODE
PIN NO.

STATE

LIC201

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

MODE
PIN NO.

STATE

55

0

110

3.93

15

0

70

3.34

125

1.68

180

0

4

0

8

0

14

0

1

0

56

3.34

111

5.07

16

3.34

71

0

126

1.67

181

3.34

5

0

9

0

15

0

15

2

2.35

57

5.08

112

2.9

17

5.19

72

0

127

1.67

182

0

6

0

10

0

16

0

16

0

3

2.35

58

0

113

1.64

18

3.42

73

3.34

128

0

183

3.34

7

3.34

11

3.34

17

12.92

17

1.46

4

2.36

59

0

114

5.07

19

3.43

74

3.34

129

1.7

184

3.34

8

0

12

3.34

18

12.92

18

0

5

2.36

60

3.34

115

0

20

0

75

3.34

130

3.34

185

0

9

0

13

0

19

5.1

19

3.35

6

0

61

3.34

116

0

21

3.34

76

1.02

131

1.7

186

1.5

10

0

14

0

20

5.1

20

3.35

7

2.14

62

3.34

117

0

22

0

77

3.33

132

1.47

187

0

11

0

15

0

21

5.1

LIC
L 505
IC

505

8

2.14

63

0

118

1.65

23

0

78

3.34

133

1.83

188

0

12

0

16

0

22

5.1

1

5.1

9

2.14

64

0

119

1.3

24

5.04

79

3.34

134

1.68

189

0

13

3.34

17

0

23

5.1

2

1.52

10

2.14

65

0

120

2.38

25

1.51

80

0

135

1.62

190

0

14

3.34

18

0

24

5.1

3

0

11

5.07

66

0

LIC
L 202
IC

202

26

0

81

0

136

0

191

0

15

3.34

19

0

25

5.1

4

1.52

12

2.13

67

1.67

1

3.33

27

5.08

82

3.34

137

2.9

192

0

16

3.34

20

0

26

1.67

5

3.34

13

2.38

68

1.63

2

0

28

0

83

0

138

1.51

193

0

17

3.34

21

0

27

0

LIC
L 506
IC

506

14

2.14

69

0

3

0

29

3.43

84

0

139

0

194

0

18

0

22

0

28

5.1

1

3.34

15

2.14

70

0

4

0

30

5.07

85

1.51

140

0

195

0

19

0

23

0

29

1.67

2

3.34

16

2.14

71

0

5

0

31

3.43

86

0

141

0

196

0

20

3.34

24

0

30

2.06

3

0

17

2.14

72

0

6

0

32

3.43

87

0

142

0

197

0

21

0

25

0

31

12.92

4

3.35

18

0

73

0

7

0

33

3.35

88

0

143

0

198

0

22

0

26

3.34

32

12.92

5

3.35

19

2.39

74

0

8

3.34

34

3.32

89

3.34

144

0

199

0

23

0

27

0

33

12.92

20

0.11

75

3.33

LIC203
LIC

203

35

3.32

90

0

145

0

200

0

24

0

28

3.34

34

0

21

2.38

76

3.33

1

0

36

3.32

91

0

146

0

201

0

25

3.34

29

0

35

0

22

0.11

77

0

2

2.13

37

3.33

92

0

147

0

202

0

26

0

30

0

36

0

23

0

78

3.33

3

5.08

38

3.31

93

0

148

3.34

203

3.34

27

0

31

3.33

37

0

24

2.38

79

1.82

LIC
L 204
IC

204

39

3.32

94

0

149

3.34

204

0

28

0

32

0

38

0

25

2.38

80

2.37

1

1.7

40

3.32

95

0

150

3.34

205

0

29

0

33

0

39

0

26

1.71

81

1.89

2

1.69

41

3.32

96

3.34

151

0

206

0

30

0

34

0

40

0

27

0

82

0

3

1.55

42

0

97

0

152

3.32

207

0

31

0

35

3.33

41

0

28

0

83

2.36

4

0

43

3.32

98

0

153

0

208

0

32

0

36

0

42

1.68

29

0

84

1.66

5

0

44

3.34

99

0

154

0

209

0

33

0

37

0

43

3.34

30

5.06

85

1.68

6

1.35

45

3.32

100

3.32

155

3.34

210

3.33

34

3.34

38

0

44

0

31

0

86

1.61

7

1.35

46

3.32

101

3.32

156

0

211

0

35

1.02

39

0

45

0

32

0

87

1.69

8

5.08

47

3.32

102

3.32

157

3.34

212

0

36

3.4

40

0

46

1.7

33

0

88

2.6

LIC
L 205
IC

205

48

3.32

103

0

158

3.34

213

0

37

0

41

0

47

1.66

34

0

89

5.07

1

1.97

49

3.32

104

1.64

159

0

214

3.33

38

0

42

0

48

5.1

35

0

90

0

2

0

50

3.32

105

0

160

3.34

215

0

39

0

43

0

49

0

36

2.52

91

3.17

3

1.68

51

0

106

3.33

161

3.34

216

3.33

40

0

44

0

50

0

37

2

92

3.17

4

1.68

52

3.85

107

3.34

162

1.64

LIC
L 302
IC

302

41

0

45

0

51

0

38

3.34

93

1.29

5

5.07

53

0

108

0

163

1.4

1

0

42

0

46

0

52

0

39

1.68

94

1.87

6

0

54

3.31

109

1.67

164

1.21

2

3.34

43

0

47

0

53

0

40

5.07

95

1.75

55

0

110

1.67

165

0

3

0

44

3.34

48

0

54

0

41

1.57

96

1.81

1

1.61

56

0

111

1.66

166

1.31

4

3.34

45

0

LIC
L 502
IC

502

LIC
L 504
IC

504

42

1.61

97

1.83

2

1.45

57

0

112

0.72

167

2.79

5

0

46

0

1

0

1

0

43

0

98

5.07

3

1.42

58

0

113

0

168

1.31

6

0

47

0

2

0

2

3.34

44

1.26

99

0

4

0

59

0

114

0

169

0

7

0

48

0

3

12.92

3

1.3

45

5.07

100

0

5

0

60

0

115

1.66

170

0

8

0

49

0

4

1.68

4

1.32

46

2.36

101

0

6

3.34

61

0

116

1.66

171

3.34

LIC
L 303
IC

303

50

0

5

1.67

5

3.35

47

2.36

102

0

7

3.34

62

0

117

1.84

172

3.32

1

0

LIC
L 501
IC

501

6

1.7

6

0

48

2.41

103

1.14

8

0

63

0

118

3.34

173

1.28

2

3.34

1

0

7

1.7

7

0

49

2.43

104

1.81

9

0

64

0

119

3.29

174

3.24

3

3.85

2

0

8

1.7

8

0

50

0

105

0

10

0

65

0

120

1.51

175

0

4

5.11

3

0

9

1.7

9

0

51

0

106

3.93

11

0

66

0

121

1.01

176

0

LIC
L 304
IC

304

4

0

10

0

10

0

52

3.34

107

3.93

12

0

67

0

122

2.29

177

0

1

3.34

5

0

11

0

11

3.35

53

3.34

108

3.93

13

0

68

0

123

1.67

178

0

2

0

6

0

12

12.92

12

3.35

54

3.34

109

3.93

14

0

69

0

124

1.68

179

1.51

3

0

7

0

13

0

13

0.78

LIC301

5-61

5-62

141.27
0

PRINTED CIRCUIT DIAGRAMS
1. MAIN P.C.BOARD

LOCATION GUIDE

5-63

5-64

2. MAIN P.C.BOARD

LOCATION GUIDE

5-65

5-66
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Create Date                     : 2005:04:27 19:00:02Z
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Format                          : application/pdf
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Title                           :  VJW602CP'7_Allegro_COVER
Author                          : PSJ
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