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Daewoo
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DV-S123
Service Manual
51 pgs7.58 Mb0

Daewoo DV-S123, DV-S103 Service Manual

1
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
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
* : Class model only
AC Line Voltage Region
Insulation
Resistance
Dielectric
Strength
Clearance
Distance(d),(d)
100V Japan
¡Ã
1
§Û
/500V DC 1
§Ç
AC 1min.
¡Ã
3
110 to 130V
USA &
Canada
- 900V AC 1min.
¡Ã
3.2
* 110 to 130V
200 to 240V
Europe
Australia
Latin America
¡Ã
10
§Û
/500V DC 4
§Ç
AC 1min.
¡Ã
6(d)
¡Ã
8(d’)
(a :Power cord)
This table is unofficial and for reference only. Be sure to confirm the precise values for your
particular country and locality
NOTE
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 termi-
nals, 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
i ¡Â
1
§Ì
rms
Exposed accessible parts
110 to 130V USA &Canada
15k
§Þ
1
§Ú
i ¡Â
0.5
§Ì
rms
Exposed accessible parts
110 to 130V
200 to 240V
Europe
Australia
2
§Ú
i ¡Â
0.7
§Ì
peak
i ¡Â
2
§Ì
dc
Antenna earth terminals
50
§Ú
i ¡Â
0.7
§Ì
peak
i ¡Â
1
§Ì
dc
Other terminals
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.
NOTE
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
EXTERNAL VIEWS
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
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
GENERAL ADJUSTMENT
SERVO CIRCUIT
ADJUSTMENT PROCEDURE
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
ITEM
ADJUSTMENT
PARTS
CHECK POINT TEST EQUIPMENTS MODE TEST TAPE
Playback
Phase
R591
TJ591(V.SW)
TJ391(VIDEO OUT)
Oscilloscope Play DP-2
LOCATION OF ADJUSTMENT PARTS OBSERVATION WAVEFORM
MOD
A/V JACK
TJ391
(VIDEO OUT)
PRE-AMP
SMPS
TJ591
(V. SW)
R591
FRONT
SPECIFICATIONS
INPUT/OUTPUT JACK TYPE
SYSTEM
Video signal
RF Output
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)
VIDEO
Input : Video line in
Output : Video line out
Recording system
Signal to Noise ratio
Horizontal Resolution
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)
AUDIO
Input : Audio line in
Output : Audio line out
Frequency Response
Signal to Noise Ratio
Audio Distortion
-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)
TAPE TRANSPORT
Format
Tape Width
Tape Speed
Maximum Recording Time
FF/REW time
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
GENERAL
Power Requirements
Power Consumption
Temperature
Operating position
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
DIMENSIONS
Carton size (W x H x D)
Set size (W x H x D)
Weight
417 x 172 x 369 mm
280 x 91 x 347 mm
3.5 Kg
Model For CIS For Middle East / Asia
Jack Type SCART Type
RCA Jack
(Phone Jack)
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 trans-
former)and GND must be connected GND into the primary GND (But there is no connection when checking the seca-
ondary circuit.
When changing M801, check FUSE and ceramic resistor properly.
A-1. CHECKING THE PRIMARY CIRCUIT.
A-2. CHECKING THE SECONDARDARY CIRCUIT.(Before secondary circuit open).
No output voltage
YES
Is the voltage applied to
CN11?
NO
Check F801, L801, L802
C803, D801, R801
YES YES
Is the voltage +15V at pin3
of IC11?
NO
Is the voltage above 10V
at pin3 of IC11?
NO
Is the voltage 0V at pin3
of IC11?
YES YES YES
Check the secaondary
circuit
NO
( A )
NO
Check R14, R15, T11
R13, D11, L12
(A)
YES
Check each output voltage
NO
Check transformer of no
output stages
YES
NO
Check the diode of no
output stages
YES
Check the CN11
YES
Check the coil, condensor
of no output stages
TROUBLE SHOOTING GUIDE
A-3. CHECKING THE DC - INPUT CIRCUIT.
B. LED DISPLAY CIRCUIT.
Do not turn on the front
DISPLAY
YES
Check the polarity of
DC adaptor
NO
Change the DC adptor
YES
Is Vcc input at pin1 of
IC803?
NO
Check JK801 and pattern
YES
Check SERVO/SYSCON
circuit
NO
Is 1.25V input at pin4 of
IC803?
NO
Check R805, R806 and
R807
YES
Check SERVO/SYSCON
circuit
LED does not operate
properly.
NO
Is +5.1V supplied from
D510 cathod to L701?
NO
Check power module
YES
Is +5.1V supplied to the
collectors of Q701~Q706?
NO
Check L701
YES
Are the signals supplied
from u-com to the bases
of Q701~Q706?
NO
Check u-com
YES
Are the signals supplied
from u-com to the bases
of Q707~Q713?
NO
Check u-com
YES
Are the signals supplied
To the LED(G701)?
NO
Check Q701~ Q713 and
patterns
YES
Check G701 and pattern
10
TROUBLE SHOOTING GUIDE
C. SERVO/SYSCON CIRCUIT
C-1. FRONT KEYS
C-2. PICTURE IN PB MODE
Front keys do not operate
correctly
YES
Is +5.1V supplied to pin18
of IC501?
NO
Check power module
YES
Is +5.1V supplied to the
emitter of Q502?
NO
Check u-com, JP053 and
JP059
YES
Is +5.1V input at pin41 of
IC501?
NO
Check Q502 and circuit
YES
Check IC501
PB picture is not good
NO
Adjust tracking
YES
Noise appears although
adjusting tracking?
NO
Noise appears although
Change cassette tape
YES
Check and re-adiust the
path of DECK
YES
Is CTL pulse output at
pin1 of IC505?
NO
AC HEAD's height is
normal and there is not
dust?
NO
Adjust the head height
and remove dust
YES YES
YES
Is CTL pulse input at
pin29 of IC501?
NO
Check C556, C533 and
D505
Check IC505 and adjacent
circuit
YES
The voltage of IC501's
pin18 is not changing?
NO
Check power module
YES
Check IC501
11
TROUBLE SHOOTING GUIDE
C-3. PICTURE IN PB MODE
C-4. AUTOSTOP IN PB MODE
PB picture is not good
YES
Noise appears on the
screen on the whole?
NO
Noise appears on the
screen at the bottom?
NO
Check flow C-2
YES YES
Is V-SW puls applied to
PREAMP circuit?
NO
Is V-SW pulse supplied
From pin46 of IC501?
Adjust the PG delay
(R591)
YES
YES
YES
NO
Check R524 and pattern
Check D.PG input at pin13
of IC501 and P502
Is DC-ENVE waveform
input at pin39 of IC501?
NO
Is DC-ENVE waveform
output at pin6 of IC401?
NO
Check video circuit
YES
Check video circuit
Autostop during playback
YES
Are S&T pulses input at
pin1 and pin7 of IC501?
NO
Check reel sensors
YES
Is D.FG input at pin30 of
IC501?
NO
Is D.PWM output at pin33
of IC501?
NO
Check IC501
YES
YES
Check IC501 Check P502 and R536
12
TROUBLE SHOOTING GUIDE
C-5. CASSETTE IS NOT INSERTED
Cassette is not inserted
YES
Is ON/OFF 12V supplied
at pin7 of IC503?
NO
Check power module
YES
CAM data are changed
when CST IN?
NO
Check P504
NO
Check DECK
YES
Is +5V applied to pin6
of IC503 when CST IN?
NO
Is control signal output
at pin76 of IC501?
NO
Check IC501
YES YES
Check pattern and R529
Is 8.2V supplied to pin4
of IC503?
NO
Are control signals output
at pin76 and 78 of IC501?
NO
Check IC503
YES
YES
YES
Are control signals output
at pin2 and 10 of IC503
NO
Check IC503
Check D504, D508 and
D503
YES
Check P503 and L/C
Motor.
13
TROUBLE SHOOTING GUIDE
C-6. CAPSTAN MOTOR
C-7. DRUM & CAPSTAN M/T IN REC MODE
Capstan M/T loading stops
YES
Is +14V supplied to pin7
of P501?
NO
Check power module
YES
Is the input of P502's pin6
2.5 ~ 3.5V?
NO
Check circuit of R555,
R556 and R557
YES
Is pin4 of P501 2.5V?
NO
Check R559 and R560
YES
Is C.PWM output at pin34
of IC501?
NO
Check IC501
YES
Check P501, R516, R526
and C526
Drum M/T and capstan
M/T rotate at reular speed
(IN REC MODE)
YES
Is C.SYNC applied to the
base of Q501?
NO
Check C.SYNC of IC301
and pattern
YES
Is V.SYNC input at pin28
of IC501?
NO
Check Q501 and R527
YES
Check motors
14
TROUBLE SHOOTING GUIDE
C-8. EMERGENCY
C-9. VCP DOES NOT OPERATE (ALTHOUGH POWER CIRCUIT IS NORMAL.)
Emergency mode when
plugging (power cord)
YES
Is +5.1V applied to pin18
of IC501?
NO
Check power module
YES
Does X501 crysyal
oscillate?
NO
Check IC501 and crystal
circuit
YES
Are CAM SW data cor-
rect?
NO
Recheck P504 and CAM
SW contact
YES
Check IC503 and IC501
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?
NO
Check IC502 and pattern
YES
Check flow C-8
15
TROUBLE SHOOTING GUIDE
D. AUDIO CIRCUIT
D-1. PB MODE
No sound in the PB mode
YES
Is the output at pin77 of
IC301?
NO
Is +5V supplied to pin76 of
IC301 and to pin2 of
T201?
NO
Check IC802 and adjacent
circuit
YES YES
Check R217, R218, L602
and pattern
Is voltage less than 0.2V
at pin80 of IC301?
NO
Are CLK and DATA
applied to pin63 and 64 of
IC301?
YES
YES NO
Check IC501
Is collector of Q204 GND?
NO
Check Q202, Q203 and
Q204
YES
Check pattern and AC
Head
16
TROUBLE SHOOTING GUIDE
D-2.
NO SOUND IN THE PB MODE AFTER RECORDING
IN REC MODE
Is signal audio input into
pin71 of IC301?
NO
Check R609, R610 and
JK603
YES
Is +5V applied to pin76
and 47 of IC301?
NO
Check IC802 and adjacent
circuit
YES
Is the voltage above 4V at
pin80 of IC301?
NO
Is CLK and DATA applied
to pin63 and 64 of
IC301?
NO
Check IC501
YES
Is audio signal input into
pin79 of IC301?
NO
Check C212, R215, R214
and C210
YES
YES
YES
Does pin6 of T201
Oscillate?
NO
Is the volatge from 0.7V
to 3.0V at pin5 of IC301?
NO
AC signal is put on the
DC voltage at pin5 of
IC301?
YES
YES
YES
AC signal put on 70KHz
at base of Q201?
Check AC head
YES
Clean head
Check T201's circuit
Is the voltage from 0.7V
to 0.8V at pin6 of IC301?
NO
Check IC301
YES
Check Q205
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