Sanyo DWM-1000 Service Manual page 11

TROUBLE SHOOTING
(This is a basic trouble shooting.)
VIDEO PART
1. When sound OK and picture NG.
Check IC102:video
encorder output.
NG
Check IC102:
video encorder peripheral.
(DVD/reset/pd0-8/
sync/RSET)
NG
Something is wrong
with pd0-8.
NO
Exchange disc
(error rate high).
Inquire the whole.
2. When sound and picture NG and display OK.
Check dac output and
video encorder output.
NG
IC127 NG.
Check the whole.
3. When confusion of the picture.
Recover at exchanged
loader.
NO
Recover at exchanged
MPEG p.c.board.
NO
Recover at exchanged
disc.
NG
Check fluctuation
of power source 5V.
Check contact of
connector.
NG
Check power source
p.w.board NG.
Exchange p.w.board.
Check wirng from encorder
output to set output.
OK
IC102 NG.
OK
IC127 NG.
Check wiring.
TES
Inquire wiring.
OK
Check loader.
YES
Check MPEG p.w.board.
YES
Exchange disc.
OK
Check the whole.
OK
4. When confusion of the picture.
Color change.
Horizontal/
vertical line enter.
Check video sync.
NG
IC102 video
encorder output.
NG
Check IC102 peripheral.
(IC102 NG)
5. When color NG.
27MHz
oscillating circuit trouble.
Check frequency.
OK
NG
Exchange oscillator.
Exchange C8121/C8122.
6. when not change to PAL or NTSC.
Check PAL/NTSC control
line (IC116 pin16 cn671
pin9:high NTSC/low PAL).
7. When s-terminal output NG and color NG.
Check IC102:video
encorder output.
NO
Check solder of
output terminal.
(IC102 NG)
8. When YUV/RGB NG and color NG.
Check IC102:video
encorder output.
Check S6701 peripheral
circuit.
Check RGB/YUV setting.
NO
Check setting signal
pattern.
(IC102 NG)
- 43 -
27MHz oscillating circuit
trouble.
Check frequency.
Check IC127 pin15/16.
OK
Check circuit from IC102
output to set output.
OK
IC102 NG.
Check signal pattern
and S6702.
Check circuit from IC102
output to set output.
YES Check S6701 peripheral.
Check circuit from IC102
output to set output.
Check S6701 peripheral.
IC102 NG.
YES