DV-NC65H (serv.man15). Mechanical operation and troubleshooting - Sharp DVD Service Manual (repair manual). Page 5

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53
DV-NC65H/S
DV-NC70H
FLOW CHART NO.13
Is the voltage more than about 2.6V DC given out 
of pin(29) of IC701?
Check IC701.
Is the supply voltage of 5V fed up to pin(3) of 
AC connector?
Check PC 5V line.
Is the voltage more than 2.6V DC sent in pin(9) of 
AC connector?
Check between the pin(9) of AC connector and all 
the way up thru to pin(29) of IC701.
Replace capstan motor.
NO
NO
NO
YES
YES
YES
Is approx. 3.5V applied to the pin(5) of 
AC connector?
Check the pin(91) of IC701. 
NO
YES
Is 29V applied to the pin(2) of AC connector 
normally?
Check AT 27V line.
NO
YES
The capstan motor fails to run.
FLOW CHART NO.14
Is the voltage more than about 2.6V DC given out 
of pin(30) of IC701?
Check IC701.
Is the supply voltage of 5V fed up to pin(3) of 
AC connector?
Check PC 5V line.
Is the voltage more than about 2.6V applied at 
pin(12) of AC connector?
Check between pin(30) of IC701 and all the way 
up to pin(12) of AC connector.
NO
NO
NO
YES
YES
Is the supply voltage of 12V fed up to pin(8) of 
AC connector?
Check PC 12V line.
NO
YES
Check or replace drum motor.
YES
The drum motor fails to run.
FLOW CHART NO.15
Is drum PG/FG signal given out of pin(11) of 
AC connector?
Check or replace capstan motor or drum motor.
Check line between pin(11) of AC connector and 
all the way up thru to pin(65) of IC701.
Is V-H.SW.P pulse given out of pin(23) of IC701?
Check IC701.
Replace IC701.
NO
NO
NO
YES
YES
YES
Is drum PG/FG signal given out of pin(65) of 
IC701?
The drum motor runs only for a few seconds.
FLOW CHART NO.16
     
Is the drum motor rotating?
See FLOW CHART NO.14, 15.
 
<The drum motor fails to run> 
<The drum motor runs only for a few seconds>
Is the drum PG signal and drum FG signal present 
on pin(65) of IC701, respectively?
Replace IC701.
Are the drum PG/FG signals present on pin(11) of 
AC connector?
Check line between pin(11) of AC connector and 
all the way up thru to pin(65) of IC701.
NO
YES
NO
YES
NO
YES
No head switching pulse.
D-FG
D-PG
0 V
about 2.5 V
about 5.0 V
Check or replace capstan motor unit or 
drum motor unit.
FLOW CHART NO.17
Is there 14.3MHz oscillation at pins(37) and (38) 
of IC701?
Check peripheral circuit of X701.
Is there drum PG/FG signal at pin(65) of IC701 
present?
Is there V-SYNC signal (reference) at pin(50) of IC701?
NO
YES
In PB mode
YES
In REC mode
Is the head switching pulse at pin(23) of IC701 
present?
See FLOW CHART NO.16.
<No head switching pulse>
NO
YES
NO
Is the drum APC output at pin(34) of IC701 and 
drum AFC output at pin(32) of IC701 present?
Replace IC701.
NO
YES
Is the drum control voltage applied to pin(12) of
AC connector?
Is pin(30) of IC701 in high impedance?
NO
YES
YES
Replace capstan motor or drum motor.
Drum servo does not function.
Check peripheral circuit of C715, C716 and R708.
NO
Check drum PG/FG signal line.
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