FUNAI DRVR-B778S Service Manual page 28

2 DVD Section
FLOW CHART NO.1
The key operation is not functioning.
Are the contact point and the installation state of
the key switches normal?
Is the control voltage normally inputted into Pin(8)
of IC501?
Replace IC501 or DVD MECHANISM & DVD
MAIN CBA ASSEMBLY.
FLOW CHART NO.2
No DVD operation is possible from the remote control unit. (Operation is possible from the unit.)
Is 5V voltage supplied to Pin(3) terminal of the
RM1501 (remote control receiver)?
Is the "L" pulse sent out from Pin(1) terminal of the
RM1501 (remote control receiver) when the remote
control unit is activated?
Is the "L" pulse signal supplied to Pin(14) of
IC501?
Replace IC501 or DVD MECHANISM & DVD
MAIN CBA ASSEMBLY.
FLOW CHART NO.3
The [No Disc] indication.
Both picture and sound do not operate normally.
Replace the DVD MECHANISM & DVD MAIN
CBA ASSEMBLY.
Yes
Yes
Yes
Yes
Yes
No
Re-install the key switches correctly or replace
the poor switch.
No
Check the key switches and their periphery, and
service it if defective.
Terminal voltage of IC501-8
4.30
3.60
2.90
2.39
1.98
1.61
1.27
0.92
0.51
(V)
No
Check AL+5V line, and service it if defective.
No
Replace the RM1501 (remote control receiver).
Replace remote control unit if needed.
No
Check the line between the RM1501 (remote
control receiver) and Pin(14) of IC501, and
service it if defective.
1-11-4
KEY-2
IC501-8
SENS-
INH
-----
DUBBING
REC
/OTR
OPEN/
CLOSE
-----
PLAY
-----
STOP
E9G01TR