FUNAI WD6D-M100 Service Manual page 35

3 VCR 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(7) of
IC501?
Check IC501 and their periphery, and service it if
defective.
FLOW CHART NO.2
No VCR operation is possible from the remote control. (Operation is possible from the unit.)
Is 5V voltage supplied to the Pin(3) terminal of the
RS1501 (remote control receiver)?
Is the "L" pulse sent out from Pin(1) terminal of the
RS1501 (remote control receiver) when the remote
control is activated?
Is the "L" pulse signal supplied to Pin(14) of IC501?
Check IC501 and their periphery, and service it if
defective.
Yes
Yes
Yes
Yes
Yes
No
Re-install the key switches correctly or replace
the defective key switches.
No
Check the key switches and their periphery, and service
it if defective.
Terminal voltage of IC501-7
4.30
3.60
2.90
2.39
1.98
1.61
1.27
0.92
0.51
(V)
No
Check SYS+5V line and service it if defective.
No
Replace the RS1501 (remote control receiver) or the
remote control unit.
No
Check the line between the RS1501 (remote control
receiver) and Pin(14) of IC501, and service it if
defective.
1-11-11
KEY-1
IC501-7
S-INH
CH-UP
CH
-DOWN
REC
PLAY
FF
REW
STOP
/EJECT
POWER
E9TFCTR