Sharp DV-NC100X, Service Manual

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H9745TS
3. VCR Section
Yes
Yes
No
No
FLOW CHART NO.1
FLOW CHART NO.2
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(7,8) of IC501?
Re-install some key switches correctly or
replace some key switches.
Check the key switches and their periphery, and
service it if defective.
Replace IC501.
0.51
0.92
1.27
1.61
1.98
2.39
2.90
3.60
4.30
-----
-----
-----
OUTPUT
SELECT
-----
FF
-----
S-INH
-----
-----
REC/OTR
CH UP
POWER
REW
PLAY
-----
CH
DOWN
STOP
/EJECT
Terminal voltage of IC501-7,8
KEY-1
IC501-7
KEY-2
IC501-8
(V)
Replace the RM2001 (remote control receiver).
Replace remote control unit if need.
Check the line between the RM2001 (remote
control receiver) and the Pin(14) of IC501, and
service it if defective.
Replace IC501.
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(14) of
IC501?
Yes
Is 5V voltage supplied to the Pin(3) terminal of
the RM2001 (remote control receiver)?
Yes
Yes
No
Check AL+5V line and service it if defective.
No
No
No VCR operation is possible from the remote control unit. (Operation is possible from the unit.)