Read Sharp VC-M332HM (serv.man15) Service Manual online
46
VC-M332HM
VC-MH742HM
VC-MH742HM
FLOW CHART NO.21 Hi-Fi SOUND MODE TROUBLESHOOTING(1) (For VC-MH742HM)
No Hi-Fi E-E sound heard.
Decoder signal input terminal.
L-ch pin(15)
R-ch pin(10)
YES
NO
Front A/V signal input terminal.
L-ch pin(4)
R-ch pin(2)
NO
Are there the serial data and clock at pins(43)
and (42) of IC6301?
YES
NO
Is the supply voltage of 5V fed to pin(40) and
9V fed to pin(58) of IC6301?
YES
NO
RF output : Is there audio signal outputted at pin(59) of IC6301?
NO
YES
YES
NO
Check peripheral circuit of IC6301.
Check line ranging from pins(31),(30) of
IC2501(DECODER), to the each input terminal
of IC6301.
Check line between pins(43),(42) of IC6301
and pins(27),(28) of IC701.
Check PC 5V and PC 9V lines.
Check line ranging from front audio input
terminal of IC6301.(J2102/2103)
Is there audio signal inputted at each input terminal of IC6301 as shown in table?
YES
YES
YES
Is there audio signal outputted at pin(11) of
IC201.
Does fh trap circuit operate normally?
YES
YES
Is there audio signal inputted at pin(62) of
IC6301.
RF output : Is there audio signal outputted at pin(59) of IC6301 to the audio input terminal of tuner
(TU1551).
NO
Check the AUDIO MUTE (H) line between pin(36) of IC6301 and pin(21) of IC701.
NO
NO
NO
Check PC 5V lines.
Is there "L" level at pin(99) of IC201?
Check fh trap circuit.(Q601,Q602)
Check line between pin(11) of IC201 and pin
(62) of IC6301.(Q601,Q602)
Check AUDIO MUTE (H) line between pin(99)
of IC201 and pin(21) of IC701.
NO
Is the supply voltage of 5V fed to pin (96) of
IC201?.
YES
Is there "L" level at pin(36) of IC6301?
Is there audio signal inputted at pins(45) and (46) of IC6501(DOLBY PROLOGIC SORROUND
PROCESSOR)?
YES
NO
Is there audio signal outputted at pins(20) and (19) of IC6401 (SORROUND AUDIO PROCESSOR)?
YES
NO
Check line between pins(53),(57) of IC6301 and pins(45),(46) of IC6501.
Check peripheral circuit of IC6501 and IC6401.(DOLBY PROLOGIC SORROUND AUDIO PROCESSOR)
Is there audio signal inputted at pins(36) and (33) of IC2501?
YES
NO
Is there audio signal outputted at pins(35),(29)and (32),(28) of IC2501?
YES
Check the line between IC2501 peripheral and output terminl periphery.
NO
Check line between pins(20),(19) of IC6401 and pins(36),(33) of IC2501.
Check peripheral circuit of IC2501.
((For Hi-Fi audio mode))
Tuner signal input terminal(U/V mono)
pin(8).
NO
AUX. signal input terminal pin(9).
NO
Check line ranging from pin(10) of IC1602.
Check line ranging from pin(61) of IC6301.
Is there audio signal inputted at each input terminal of IC201 as shown in table?
((For linear audio mode))
Line output : Is there audio signal outputted at pins(53)and(57) of IC6301?
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