Read Sharp DV-NC55 (serv.man10) Service Manual online
49
DV-NC55S/H
DV-NC60H
DV-NC60H
FLOW CHART NO.12
Is there 14.3MHz oscillation at pins(37) and (38)
of IC701?
Check peripheral circuit of X701.
Is there drum FG signal at pin(65) of IC701 present?
Is the 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.11
<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(2) of
IC7002?
Is pin(58) of IC701 in high impedance?
NO
YES
Does the IC7002 operate normally?
YES
Replace drum motor.
YES
Drum servo does not function.
Check peripheral circuit of C746-747 and R745.
NO
Check drum FG signal line.
FLOW CHART NO.13
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 (TP201)?
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?
Does pin(59) of IC701 operate
normally?
Check "
1
"
Check "2"
Replace IC701.
Is there REC CTL signal output at
pins(75) and (74) of IC701?
Is the V-SYNC signal(reference) at
pin(50) of IC701?
Check peripheral circuit of
C746-747 and R745.
Is there capstan AFC and APC
at pins(31) and (33) of IC701?
Capstan servo does not function.
FLOW CHART NO.14
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
NO
NO
NO
YES
YES
Is picture signal input into pins(30), (28) and (31)
of IC201?
Is picture signal output to the pin(52) of IC201?
Is picture signal input into the pin(49) of IC701?
Check the line between pin(52) of
IC201 and pin(49) of IC701.
Is 5V applied to the pin(12) of IC201?
Check the YC 5V line.
1
External input mode
•
Check the line between the front video input
terminal and pin(28) of IC201.
2
U/V tuner mode
Check the line between the pin(25) of U/V tuner
and pin(31) of IC201.
Is picture signal output to the pin(47) of IC701 ?
Is 5V applied to the pin(51) of IC701?
Check the AT 5V line.
Is picture signal output to the emitter of video
output buffer (Q708)?
Line output: Is there V-SYNC signal input at
pin(3) of IC2004.
Check the line between pins(63) and (62) of IC201
and pins(56) and (57) of IC701.
Check Q708 periphery.
NO
Check the line between the Q708 emitter and the
pin(3) of IC2004.
Is there V-SYNC signal output at pin(7) of IC2004.
YES
NO
Check the VIDEO OUT terminal (J1202) and the
line between the pin(7) of IC2004 and the VIDEO
OUT terminal (J1202).
YES
YES
Are the pin(1) of IC2004 on "L" level?
Replace IC2004.
NO
Check the DVD-H line.
NO
Is 5V applied to the pin(6) of IC2004.
Check the PC 5V line.
RF output: Check Q708 periphery and tuner pin(6)
periphery.
Is serial data clock signal applied to the pins(63)
and (62) of IC201?
Picture E-E does not appear.
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