Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo DV DV-ST7L3 & ST7E3 & ST7C3 & ST7B3 DV-ST7L3 & ST7E3 & ST7C3 & ST7B3

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S/M No. : VTG7J3DET0

Service Manual
Video Cassette Recorder
ALL T-MECHA (Hi-Fi/MONO)
Model: (PAL/SECAM MODELS)
DVST7C3/4C3/2C3 Series
DVST7E3/4E3/2E3 Series
DVST7M3/4M3/2M3 Series
DVST7J3/4J3/2J3 Series
DVST7D3/4D3/2D3 Series
DVST7T3/4T3/2T3 Series
DVST7W3/4W3/2W3 Series
DVST7L3/4L3/2L3 Series

DVST7L3

DVST7E3

DVST7C3

DVST7B3

DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr Apr. 2002
TABLE OF CONTENTS

SAFETY&PRECAUTIONS ................................................................................................ 2
EXTERNAL VIEWS ......................................................................................................... 4
FRONT VIEWS FUNCTION .................................................................................................................... 4
REAR VIEWS FUNCTION ...................................................................................................................... 6

ELECTRICAL ADJUSTMENT............................................................................................ 7
SPECIFICATIONS ......................................................................................................... 8
CIRCUIT INFORMATION ............................................................................................... 9
INTERCONNECT WIRING DIAGRAM..................................................................................................... 9
POWER CIRCUIT DIAGRAM................................................................................................................. 10
POWER BLOCK DIAGRAM .................................................................................................................. 12
SYSCON CIRCUIT DIAGRAM ............................................................................................................... 13
SERVO & SYSCON BLOCK DIAGRAM .................................................................................................. 15
A/V & SECAM COLOR CIRCUIT DIAGRAM........................................................................................... 16
VIDEO PLAYBACK/RECORD PATH FOR PAL .......................................................................................... 18
HIFI & SW CIRCUIT DIAGRAM.............................................................................................................. 19
PIF CIRCUIT DIAGRAM........................................................................................................................ 21

COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ............................................ 23
PCB MAIN.......................................................................................................................................... 23

DISASSEMBLY ............................................................................................................. 24
PACKING ASS' ................................................................................................................................. 24
Y
FRONT PANEL ASSEMBLY ................................................................................................................... 25
INSTRUMENT DISASSEMBLY ................................................................................................................. 29

ELECTRICAL PARTS LIST ............................................................................................... 30
PCB MAIN AS .................................................................................................................................... 30

1
SAFETY & PRECAUTIONS
SAFETY CHECK AFTER SERVING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires
have been returned to original positions. Afterwards, perform the following tests and conform the specified values in order
to verify compliance whit safety standards.

1. Insulation resistance test
Confirm the specified insulation resistance between power cord plug prong and externally exposed parts of the set
(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)
isgreater than values given in table 1 below.

2. Dielectric strengthen test
Confirm specified dielectric strengthen between power cord
plug prongs and exposed accessible parts of the set
(RF terminals, antenna terminals, video and audio input output
terminals, microphone jack, ear phone jacks, etc.)
is greater than values given table 1.

3. Clearance distance
When replacing primary circuit component, confirm specified clearance distance (d), (d' between soldered terminals,
)
and between terminals and surrounding metallic parts. See table below.

Rating for selected areas

Insulation Dielectric Clearance
AC Line Voltage Region
Resistance Strength Distance(d),(d)
100V Japan >1M/500V DC 1kV AC 1min. >3
110 to 130V USA & Canada - 900V AC 1min. > 3.2
Europe > 6(d)
* 110 to 130V
Australia >10M/500V DC 4kV AC 1min. > 8(d')
200 to 240V
Latin America (a :Power cord)

* : Class model only

NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values for your
particular country and locality

2
SAFETY & PRECAUTIONS

4. Leakage current test
Confirm specified or lower leakage current between B(earth
ground, power cord plug prongs) and externally exposed accessi-
ble parts (RF terminals, antenna terminals, video and audio input
output terminals, microphone jacks, earphone jacks, etc.)
Measuring method:(Power ON) Insert load Z between B(earth
ground, power cord plug prongs) and exposed accessible parts.
Use on AC voltmeter to measure across both terminals of load Z.
See figure2 and following table.

Leakage current ratings for selected are as

Leakage Cur-
AC Line Voltage Region Load Z Clearance Distance(d),(d'
)
rent(i)

100V Japan i < 1 mArms Exposed accessible parts
1k

110 to 130V USA &Canada 15kmF i < 0.5mArms Exposed accessible parts
1k

i< 0.7mA peak
Antenna earth terminals
2k i< 2mAdc
110 to 130V Europe
200 to 240V Australia
i< 0.7mA peak
Other terminals
50k i < 1mAdc

NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.

3
EXTERNAL VIEWS
1. FRONT VIEWS FUNCTION

DVST7C3 FRONT VIEW

DVST7E3 FRONT VIEW

DVST7L3 FRONT VIEW

DVST7M3 FRONT VIEW

4
EXTERNAL VIEW

DVST7J3 FRONT VIEW

DVST7D3 FRONT VIEW

DVST7B3 FRONT VIEW

DVST8T3 FRONT VIEW

DVST8W3 FRONT VIEW

POWER REWIND / REVIEW
STOP / EJECT FAST FORWARD / CUE
RECORD PLAY BACK
FRONT VIDEO/AUDIO INPUT JACK CHANNEL UP / DOWN

5
EXTERNAL VIEWS

2. REAR VIEWS FUNCTION

MONO 1 SCART TYPE REAR VIEW

MONO 2 SCART TYPE REAR VIEW

HI-FI 2 SCART TYPE REAR VIEW

MONO RCA TYPE REAR VIEW

HI-FI RCA TYPE REAR VIEW

6
ELECTRICAL ADJUSTMENT
1. PLAYBACK PHASE

ADJUSTMENT TEST TEST INPUT
ITEM MODE CHECK POINT
POINT EQUIPMENT TAPE SIGNAL
6.5H PIN 4 & PIN 5
PLAY [REC] BUTTON OSCILLOSCOPE DP-2 NO SIGNAL
ADJUSTMENT OF P502

ADJUSTMENT PARTS MEASURING POINT
PCB : MAIN - TOP VIEW
TMI P502
OSCILLOSCOPE
BLOC
PRE-
AMP CH1 CH2

TO PATH JIG PATH JIG

ADJUSTMENT PROCEDURE

1. Play back the test tape. (DP-2)

2. Set the oscilloscope to the CHOP mode. Connect CH1 to the SW PULSE (PIN 4 of P502)

3. Connect CH2 to the ENVE signal (PIN5 of P502)

4. Insert PATH JIG and press "REC" button on the remote control.

5. Check the position of the V-sync from the rising edge of the SW pulse.
(Standard : 6.5H

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