Read Sharp VC-M522HM (serv.man8) Service Manual online
48
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2) (For VC-MH722HM/MH732HM)
No linear sound playback(E-E mode is possible)
Is there signal at pin(100) of IC201?
Are the MH-AA harness and the PB AMP
peripheral parts normal?
YES
YES
YES
YES
YES
NO
Is there "L" level at pin(99) of IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
NO
Is there audio signal inputted at pin
(62) of IC6651?
Check line between pin(11) of IC201 and pin
(62) of IC6651.
NO
Is there signal at pin(11) of IC201?
Replace IC201.
YES
NO
NO
Clean A/C head.
Readjust azimuth
Is the azimuth hight of A/C head properly
adjusted?
Replace A/C head.
Replace IC201.
FLOW CHART NO.26 LINEAR SOUND MODE TROUBLESHOOTING(1) (For VC-M522HM)
No E-E sound.
Is there audio signal inputted at each
input terminal of IC201 as shown in table?
Check PC 5V lines.
YES
YES
NO
YES
NO
NO
Is there audio signal outputted at pin(11)
of IC201?
Is the supply voltage of 5V fed to pin(96) of
IC201?
YES
NO
Does fh trap circuit operate normally?
Check fh trap circuit.(Q601,Q602)
Is there "L" level at pin(99) of IC201?
YES
Check AUDIO MUTE (H) line between pin(99) of
IC201 and pin(21) of IC701.
Decoder signal input terminal.
Pin(9) of IC201.
Front A/V signal input terminal.
Pin(7) of IC201.
Check line ranging from pin(31) of IC2501
(DECODER), to the each input terminal of IC6651.
Check line ranging from Front A/V input terminal of
IC6651.
YES
NO
RF output : Is there audio signal inputted
at pin(2) of TU1551?
Line output : Is there audio signal inputted
at pin(36) of IC2501?
Check line between fh trap circuit and pin(2) of
TU1551.
NO
Check peripheral circuit of IC2501.
YES
Is there audio signal outputted at pins
(35) and (29) of IC2501?
Check the line between IC2501 peri-
pheral and output terminal periphery.
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