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3-1-3 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
Pins(66,67) of IC501?
Replace IC501.
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 the Pin(3) terminal of
the RM2001 (remote control receiver)?
Is the "L" pulse sent out from Pin(1) terminal of
the RM2001 (remote control receiver) when the
remote control unit is activated?
Is the "L" pulse signal supplied to the Pin(1) of
IC501?
Replace IC501.
3-8
Yes
Yes
Yes
Yes
Yes
No
Re-install some key switches correctly or
replace some key switches.
No
Check the key switches and their periphery, and
service it if detective.
Terminal voltage of IC501-66,67
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 detective.
No
Replace the RM2001 (remote control receiver).
Or replace remote control unit.
No
Check the line between the RM2001 (remote
control receiver) and the Pin(5) of IC501, and
service it if detective.
KEY-1
KEY-2
IC501-67
IC501-66
-----
-----
-----
-----
-----
-----
CH
S-INH
DOWN
FF
CH UP
PLAY
REW
STOP
-----
/EJECT
-----
POWER
DVD/VCR
REC
SELECT
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