Samsung DVD-709, Service Manual

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Troubleshooting
7-8 Samsung Electronics
No front (SET) operation
REF +/-, 5V-all, -28V
power is supplied.
12MHz oscillation (FY1)?
If the problem persists ;
Check after replacing Jack PCB,
with another one.
Check other parts for abnormal
front operation persists.
Check power status.
Check X-TAL peripheral circuit.
Yes Yes
No No
Reset working in
FIC1-12?
Check reset peripheral circuit of FIC2.
Yes
No
FIC1 soldering is OK?
Check FIC1 soldering.
Yes
No
Operational waveform
is missing in FIC3
(FLT) pin?
Check FIC1 peripheral circuit.
Yes
Yes
Key of STOP, PLAY, OPEN
work normally?
Check S/W interface.
Check communication status with
main micom
(Check FIC1 pins 27, 72, 73, 74, 75)
No
No
DVD play error
'NO DISK' appears
after pick-up moves up and
down twice at power on?
27MHz clock is
input in DIC1-14?
VIC1 peripheral soldering
and short check.
Check DIC1, MIC1 peripheral short.
Check 27MHz oscillating part.
Yes
No No
Signals are output
from SIC1-42, 44?
Replace SIC1.
Yes
No
Yes