48
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
YES
YES
NO
NO
FLOW CHART NO.21 Hi-Fi SOUND MODE TROUBLESHOOTING(1)
Check line ranging from pins (31),(30) of
IC1701 (NICAM/GR), to the each input
terminal of IC2501.
Check PC 5V and Hi-Fi 9V lines.
Is the supply voltage of PC 5V fed to pins(24),
(40) and 9V fed to pin (58) of IC651?
No Hi-Fi E-E sound heard
Is there audio signal inputted at each input
terminal as shown in table?
Tuner input terminal. IC2501 IC2501
pin(16) pin(15)
Decoder signal input
terminal.
Check line ranging from pins (39),(40) of
IC2501 (decoder circuit) or audio input
terminal to the each input
terminal of IC651.
Are there the serial data and clock at pins
(42) and (43) of IC651?
Check line between pins (42),(43) of IC651
and pins (21),(27) of IC701?
Check line between pins (57)and (53) of
IC651.
Is there audio signal outputted at pin (57)
of IC651?
Is there audio signal outputted at pins (5),
(53) of IC651?
YES
NO
NO
Is there audio signal inputted at each input
terminal of IC201 as shown in table?
U/V tuner audio input terminal. pin(9)
Aux input terminal pin(8)
Is there audio signal outputted at pins (11),
of IC201?
Is there audio signal outputted at pin (62)
of IC651?
NO
NO
NO
NO
NO
Check line ranging from A-out pin (21),of
TU101.
Check line ranging from pin (61) of IC651.
Line output terminal : Is there audio signal outputted at pins (59) and (53) of IC651?
RF output terminal : Is there audio signal outputted at pin(59) of IC651?
Replace IC201.
Is there "L" level at pin(99) of IC201?.
Check line between pin (36) of IC651 and
pin(81) of IC701.
Check line between pin (11) of IC201 and
pin (62) of IC651
YES
NO
Is there "L" level at pin(8) of IC651?.
Check line between pin (8) of IC651 and
pin (21) of IC701
Replace IC651.
YES
YES
YES
YES
YES
NO
NO
Line output terminal
Check line ranging from pins (59) and (53) of IC651 to pins (2) and (1) of IC2501.
RF output terminal
Check line ranging from pin (59) of IC651 to the audio input terminal of tuner TU101.
<For Hi-Fi mode>
<For normal mode>
IC651 IC651
pin(14) pin(9)
www.freeservicemanuals.info
Digitized in Heiloo the Netherlands
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