Daewoo DV-S123, DV-S103 Service Manual
TABLE OF CONTENTS
SAFETY&PRECAUTIONS ............................................................................................... 2
EXTERNAL VIEWS ........................................................................................................ 4
1. FRONT VIEWS FUNCTION ............................................................................................................... 4
2. REAR VIEWS FUNCTION ................................................................................................................. 5
GENERAL ADJUSTMENT .............................................................................................. 6
SPECIFICATIONS ....................................................................................................... 7
TROUBLE SHOOTING GUIDE ........................................................................................ 8
1. TROUBLE SHOOTING FLOW CHART ................................................................................................ 8
2. VOLTAGE CHART ........................................................................................................................... 25
3. WAVEFORMS ON VIDEO CIRCUIT .................................................................................................. 26
4.¥ì-COM PIN ASSIGNMENT ........................................................................................................... 29
PRINTED CIRCUIT BOARD ............................................................................................ 32
1. PCB MAIN ..................................................................................................................................... 32
2. PCB POWER(SMPS) ........................................................................................................................ 33
CIRCUIT DIAGRAM ..................................................................................................... 34
1. CONNECTION DIAGRAM .............................................................................................................. 34
2. POWER CIRCUIT ............................................................................................................................ 35
3. SERVO SYSCON CIRCUIT ............................................................................................................... 36
4. AV INPUT OUTPUT CIRCUIT .............................................................................................................. 37
5. VIDEO AUDIO CIRCUIT .................................................................................................................. 38
EXPLODING VIEWS & PARTS LIST ................................................................................. 39
1. PACKING AS ................................................................................................................................. 39
2. SET TOTAL ASSEMBLY ..................................................................................................................... 40
3. FRONT PANEL ASSEMBLY ............................................................................................................... 41
ELECTRICAL PARTS LIST ............................................................................................... 43
1. PCB MAIN AS ................................................................................................................................ 43
2. PCB AUTO VOLT REGULATOR AS ................................................................................................. 48
3. DIFFERNCE PARTS LIST ................................................................................................................... 49
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.)
is
greater 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
AC Line Voltage Region
100V Japan
110 to 130V
* 110 to 130V
200 to 240V
* : Class model only
USA & Canada
Latin America
Europe
Australia
Insulation
Resistance
¡Ã1§Û
/500V DC 1
- 900V AC 1min.
¡Ã10§Û
/500V DC 4§Ç AC 1min.
Dielectric
Strength
§Ç
AC 1min.
Clearance
Distance(d),(d)
¡Ã
3
¡Ã
3.2
¡Ã
6(d)
¡Ã
8(d’)
(a :Power cord)
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 accessible 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
AC Line Voltage Region Load Z Leakage Current(i) Clearance Distance(d),(d’)
100V Japan
1
§Ú
15k
110 to 130V USA &Canada
110 to 130V
200 to 240V
Europe
Australia
1
2
50
§Þ
§Ú
§Ú
§Ú
NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.
i ¡Â1§Ì
i ¡Â
i ¡Â
i ¡Â2§Ì
i ¡Â
0.7§Ì peak
i ¡Â1§Ì
rms
0.5§Ìrms
0.7§Ìpeak
dc
dc
Exposed accessible parts
Exposed accessible parts
Antenna earth terminals
Other terminals
3
EXTERNAL VIEWS
1. FRONT VIEWS FUNCTION
DV-S103W FRONT VIEW
DV-S123W FRONT VIEW
POWER REVIND / REVIEW
STOP / EJECT FAST FORWARD / CUE
RECORD PLAY BACK
FRONT VIDEO AUDIO INPUT JACK
4
2. REAR VIEWS FUNCTION
DV-S103W & DV-S123W PHONE JACK TYPE REAR VIEW
AUDIO/ VIDEO IN/OUT JACK ANT INPUT
DC12V INPUT JACK RE OUTPUT
EXTERNAL VIEWS
DV-S103W & DV-S123W SCART JACK TYPE REAR VIEW
EURO AUDIO / VIDEO IN/OUT JACK ANT INPUT
DC12V INPUT JACK RF OUTPUT
DV-S103A & DV-S103N REAR VIEW
AUDIO / VIDEO IN/OUT JACK ANT INPUT
DC12V INPUT JACK RF OUTPUT
CH 3 OR 4 SELECT SWITCH
5
GENERAL ADJUSTMENT
SERVO CIRCUIT
ITEM
Playback
Phase
ADJUSTMENT
PARTS
R591
LOCATION OF ADJUSTMENT PARTS OBSERVATION WAVEFORM
A/V JACK
MOD
TJ391
(VIDEO OUT)
PRE-AMP
FRONT
ADJUSTMENT PROCEDURE
CHECK POINT TEST EQUIPMENTS MODE TEST TAPE
TJ591(V.SW)
TJ391(VIDEO OUT)
SMPS
TJ591
(V. SW)
R591
Oscilloscope Play DP-2
1. Preparation
Playback the test tape (DP-2).
Set the oscilloscope to the CHOP mode. Connect CH1 to the V.SW PULSE (TJ591) and CH2 to the VIDEO OUT
(TJ391) and trigger the scope with the signal from CH1.
2. Adjustment
Adjust R591 to the positive rising edge of V.SW PULSE at 6.5H ±0.5H from the V-SYNC.
3. Adjustment Inspection Standard
6.5H ± 0.5H
4. REMARKS
6
SPECIFICATIONS
SYSTEM
Video signal
RF Output
VIDEO
Input : Video line in
Output : Video line out
Recording system
Signal to Noise ratio
Horizontal Resolution
AUDIO
Input : Audio line in
Output : Audio line out
Frequency Response
Signal to Noise Ratio
Audio Distortion
TAPE TRANSPORT
Format
Tape Width
Tape Speed
Maximum Recording Time
FF/REW time
GENERAL
Power Requirements
Power Consumption
Temperature
Operating position
DIMENSIONS
Carton size (W x H x D)
Set size (W x H x D)
Weight
PAL/MESECAM/NTSC color (for DV-S103W Series)
PAL-N/NTSC color (for DV-S103A Series)
NTSC color (for DV-S103N Series)
PAL-G/K/I UHF CH22 ~ CH40
(for DV-S103W & DV-S103S Series)
NTSC-M VHF CH3 OR CH4
(for DV-S103A & DV-S103N Series)
75 ohms unbalanced, sync.
75 ohms unbalanced, sync. Negative
Rotary tow-head helical scan
More than 45dB (PAL-SP)
More than 43dB (NTSC-SP)
240 Lines (PAL-SP)
210 Lines (NTSC-SP)
-8dBm, (CENELEC standard),
more than 47, unbalanced
-6dBm, (CENELEC standard),
less than 1, unbalanced
100Hz ~ 8KHz ( for PAL-SP)
100Hz ~10KHz (for NTSC-SP)
More than 38dB (for PAL-SP)
More than 40dB (for NTSC-SP)
Less than 3% (SP)
VHS standard
12.65 (1/2)
PAL SP : 23.39mm/sec
PAL LP :11.70mm/sec
NTSC-SP : 33.35/sec.
NTSC-EP : 11.12/sec.
480min, with E-240 tape (PAL-LP)
540min, with T-180 tape (NTSC-EP)
about 5min, with T-120 tape
AC 90V ~ 260V, 50/60Hz
DC12V ~ 16V (2A)
Max. 14W (in REC mode)
5°C ~ 35°C (Operating)
-20°C ~ 60°C (Storage)
Horizontal only
417 x 172 x 369 mm
280 x 91 x 347 mm
3.5 Kg
INPUT/OUTPUT JACK TYPE
Model For CIS For Middle East / Asia
Jack Type SCART Type
RCA Jack
(Phone Jack)
7
TROUBLE SHOOTING GUIDE
1. TROUBLE SHOOTING FLOW CHART
A. POWER CIRCUIT
When changing the parts which are out of order, first, remove the power plug from the socket and then discharge the
voltage across between both terminals of C803. (Use an external approximately 20 resistance)
When check the primary circuit by using the oscilloscopes insulate the oscilloscope properly (Use the insulating transformer)and GND must be connected GND into the primary GND (But there is no connection when checking the secaondary circuit.
When changing M801, check FUSE and ceramic resistor properly.
A-1. CHECKING THE PRIMARY CIRCUIT.
No output voltage
YES
Is the voltage applied to
CN11?
YES YES
Is the voltage +15V at pin3
of IC11?
YES YES YES
Check the secaondary
circuit
NO
NO
NO
Check F801, L801, L802
C803, D801, R801
Is the voltage above 10V
at pin3 of IC11?
( A )
NO
NO
A-2. CHECKING THE SECONDARDARY CIRCUIT.(Before secondary circuit open).
(A)
YES
Check each output voltage
YES
NO
NO
Check transformer of no
output stages
Check the diode of no
output stages
Is the voltage 0V at pin3
of IC11?
Check R14, R15, T11
R13, D11, L12
YES
Check the CN11
YES
Check the coil, condensor
of no output stages
8
A-3. CHECKING THE DC - INPUT CIRCUIT.
Do not turn on the front
DISPLAY
YES
TROUBLE SHOOTING GUIDE
Check the polarity of
DC adaptor
YES
Is Vcc input at pin1 of
IC803?
YES
Check SERVO/SYSCON
circuit
YES
Check SERVO/SYSCON
circuit
B. LED DISPLAY CIRCUIT.
LED does not operate
properly.
YES
NO
NO
NO
NO
Change the DC adptor
Check JK801 and pattern
Is 1.25V input at pin4 of
Is +5.1V supplied from
D510 cathod to L701?
IC803?
NO
NO
Check R805, R806 and
R807
Check power module
Is +5.1V supplied to the
collectors of Q701~Q706?
YES
Are the signals supplied
from u-com to the bases
of Q701~Q706?
YES
Are the signals supplied
from u-com to the bases
of Q707~Q713?
YES
Are the signals supplied
To the LED(G701)?
YES
Check G701 and pattern
NO
NO
NO
NO
Check L701
Check u-com
Check u-com
Check Q701~ Q713 and
patterns
9
TROUBLE SHOOTING GUIDE
C. SERVO/SYSCON CIRCUIT
C-1. FRONT KEYS
Front keys do not operate
correctly
YES
Is +5.1V supplied to pin18
of IC501?
YES
Is +5.1V supplied to the
emitter of Q502?
YES
Is +5.1V input at pin41 of
IC501?
YES
Check IC501
C-2. PICTURE IN PB MODE
PB picture is not good
YES
Noise appears although
adjusting tracking?
NO
NO
NO
NO
NO
Check power module
Check u-com, JP053 and
JP059
Check Q502 and circuit
Adjust tracking
Noise appears although
Change cassette tape
YES
Check and re-adiust the
path of DECK
YES
Is CTL pulse output at
NO
pin1 of IC505?
YES YES
Is CTL pulse input at
NO
pin29 of IC501?
YES
The voltage of IC501's
NO
pin18 is not changing?
YES
Check IC501
AC HEAD's height is
normal and there is not
dust?
Check C556, C533 and
D505
Check power module
10
NO
Adjust the head height
and remove dust
Check IC505 and adjacent
YES
circuit
C-3. PICTURE IN PB MODE
PB picture is not good
YES
TROUBLE SHOOTING GUIDE
Noise appears on the
screen on the whole?
YES YES
Is V-SW puls applied to
PREAMP circuit?
YES
Is DC-ENVE waveform
input at pin39 of IC501?
YES
Check video circuit
C-4. AUTOSTOP IN PB MODE
Autostop during playback
NO
Noise appears on the
screen at the bottom?
NO
Is V-SW pulse supplied
From pin46 of IC501?
NO
NO
Check R524 and pattern
Is DC-ENVE waveform
output at pin6 of IC401?
YES
NO
Check flow C-2
Adjust the PG delay
Check D.PG input at pin13
of IC501 and P502
NO
Check video circuit
(R591)
YES
YES
Are S&T pulses input at
pin1 and pin7 of IC501?
YES
Is D.FG input at pin30 of
IC501?
YES
NO
NO
Check reel sensors
Is D.PWM output at pin33
of IC501?
YES
Check IC501 Check P502 and R536
NO
Check IC501
11
TROUBLE SHOOTING GUIDE
C-5. CASSETTE IS NOT INSERTED
Cassette is not inserted
YES
Is ON/OFF 12V supplied
NO
at pin7 of IC503?
YES
CAM data are changed
NO
when CST IN?
YES
Is +5V applied to pin6
NO
of IC503 when CST IN?
YES YES
Is 8.2V supplied to pin4
of IC503?
YES
Are control signals output
NO
at pin76 and 78 of IC501?
NO
at pin2 and 10 of IC503
Check power module
Check P504
Is control signal output
at pin76 of IC501?
Check pattern and R529
Are control signals output
YES
Check IC503
NO
NO
NO
Check DECK
Check IC501
Check IC503
YES
Check D504, D508 and
D503
YES
Check P503 and L/C
Motor.
12
C-6. CAPSTAN MOTOR
Capstan M/T loading stops
YES
TROUBLE SHOOTING GUIDE
Is +14V supplied to pin7
NO
of P501?
YES
Is the input of P502's pin6
NO
2.5 ~ 3.5V?
YES
Is pin4 of P501 2.5V?
YES
Is C.PWM output at pin34
NO
NO
of IC501?
YES
Check P501, R516, R526
and C526
C-7. DRUM & CAPSTAN M/T IN REC MODE
Drum M/T and capstan
M/T rotate at reular speed
(IN REC MODE)
Check power module
Check circuit of R555,
R556 and R557
Check R559 and R560
Check IC501
YES
Is C.SYNC applied to the
base of Q501?
YES
Is V.SYNC input at pin28
of IC501?
YES
Check motors
NO
NO
Check C.SYNC of IC301
and pattern
Check Q501 and R527
13
TROUBLE SHOOTING GUIDE
C-8. EMERGENCY
Emergency mode when
plugging (power cord)
YES
Is +5.1V applied to pin18
of IC501?
YES
Does X501 crysyal
oscillate?
YES
Are CAM SW data cor-
rect?
YES
NO
NO
NO
Check power module
Check IC501 and crystal
circuit
Recheck P504 and CAM
SW contact
Check IC503 and IC501
C-9. VCP DOES NOT OPERATE (ALTHOUGH POWER CIRCUIT IS NORMAL.)
VCP does not operate after
power cord plugging
YES
Is +5.1V supplied to pin1
of IC502?
NO
Check power module
YES
Is +5V input at pin63 of
IC501?
YES
Check flow C-8
NO
Check IC502 and pattern
14
D. AUDIO CIRCUIT
D-1. PB MODE
No sound in the PB mode
YES
TROUBLE SHOOTING GUIDE
NO
Is the output at pin77 of
Is +5V supplied to pin76 of
IC301?
YES YES
Check R217, R218, L602
Is voltage less than 0.2V
and pattern
Is collector of Q204 GND?
IC301 and to pin2 of
T201?
at pin80 of IC301?
YES
YES
Check pattern and AC
Head
NO
Check IC802 and adjacent
NO
Are CLK and DATA
applied to pin63 and 64 of
YES NO
Check IC501
NO
Check Q202, Q203 and
circuit
IC301?
Q204
15
TROUBLE SHOOTING GUIDE
D-2. NO SOUND IN THE PB MODE AFTER RECORDING
IN REC MODE
Is signal audio input into
pin71 of IC301?
YES
Is +5V applied to pin76
and 47 of IC301?
YES
Is the voltage above 4V at
pin80 of IC301?
YES
Is audio signal input into
pin79 of IC301?
YES
Does pin6 of T201
Oscillate?
YES
AC signal put on 70KHz
at base of Q201?
NO
NO
NO
Check R609, R610 and
Check IC802 and adjacent
Is CLK and DATA applied
to pin63 and 64 of
NO
Check C212, R215, R214
and C210
NO
Is the volatge from 0.7V
to 3.0V at pin5 of IC301?
YES
JK603
circuit
IC301?
YES
NO
NO
Check IC501
YES
AC signal is put on the
DC voltage at pin5 of
IC301?
YES
Check AC head
YES
Clean head
Check T201's circuit
Is the voltage from 0.7V
to 0.8V at pin6 of IC301?
YES
Check Q205
16
NO
Check IC301
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