DV-NC100H. Cover, Contents, , Laser beam safety precautions, Important safeguards and precautions, Standard notes for servicing, Preparation for servicing, Operating controls and functions, Cabinet disassembly instructions, Electrical adjustment instructions, Firmware renewal mode, Troubleshooting, Block diagrams, Function indicator symbols, Main Schematic diagram 1 9. - Sharp DVD Service Manual (repair manual). Page 30

Read Sharp DV-NC100H Service Manual online

1-10-8
H9741TS
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
-----
-----
-----
-----
S-INH
FF
REW
-----
-----
-----
-----
CH UP
OUTPUT
SELECT
STOP
/EJECT
PLAY
CH 
DOWN
POWER
REC/OTR
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.)

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