DV-NC65H (serv.man15). Mechanical operation and troubleshooting - Sharp DVD Service Manual (repair manual). Page 6

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54
DV-NC65H/S
DV-NC70H
 FLOW CHART NO.18
2
Only REC mode inoperative
YES
NO
NO
YES
YES
YES
NO
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
NO
YES
YES
NO
Are REC and/or PB mode inoperative?
Check peripheral circuit of X701.
1
Only PB mode inoperative
Does PB CTL signal appear at 
pin(76) of IC701 (TP204)?
Does AA-MH harness normally?
Does A/C head operate normally?
Replace A/C head.
Check AC-MC connector and 
capstan FG signal line.
Check capstan motor unit and/or 
replace.
Is there capstan AFC and APC 
at pins(31) and (33) of IC701?
Replace IC701.
Replace AA-MH harness.
Readjust the A/C head height.
Is there 14.3MHz oscillation at 
pins(37) and (38) of IC701?
Does the capstan FG signal appear
at pin(67) of IC701?
Dose pin(29) of IC701 operate 
normally?
Check 
1
.
Check 
2
.
Replace IC701.
Is there REC CTL signal output at 
pins(74) and (75) of IC701?
Is the V-SYNC signal (reference) 
at pin(50) of IC701?
Check peripheral circuit of 
C715~716 and R708.
Is there capstan AFC and APC 
at pins(31) and (33) of IC701?
Capstan servo does not function.
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