Sharp VC-H92HM Serviceanleitung Seite 63

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FLOW CHART NO.25 Hi-Fi TROUBLESHOOTING (2)
No Hi-Fi sound playback.
NO | Refer tothe E-E system
Is E-E sound heard ? troubleshooting chart.
YES
Is playback envelope signal NO
outputted at pin (21) of 1C6401 ?
Is there "L" level at pins (3) and | YES
YES
(4) of [C6401.
Replace 1C6401.
NO
Check REC/PB control circuit,
BIAS 8V and Hi-Fi CTL.
Is playback envelope signal NO
inputted at pins (20) of 1C6301 ?
YES
Check line between pin (21) of
1C6401 to pin (20) 1C6301.
Do the peripheral circuits
around pins (10) and (27) of
Is playback audio signal
outputted at pins (10) and (27)
YES
Replace 1C6301.
of 1C6301 ? C6301 function ?
YES
Check peripheral circuit
around pins (10) and (27) of
1C6301.
Pin (23) of 1C6301. Pa [i
NO
Replace iC6301.
YES
(TU1501).
FLOW CHART NO.26 Hi-Fi TROUBLESHOOTING (3)
No Hi-Fi sound recording
NO Refer to the E-E system
x ?
Is E-E sound heard 7
troubleshooting chart.
YES
Is REC FM signal outputted at pin |NO
(14) (TP6301) of 1C6301 ?
YES
Replace IC6301.
Is REC FM signal inputted to pin NO
(26) of 1C6401 2 16401.
YES
Is REC FM signal inputted at pin NO
(20) of 1C6401 ?
to pin (20) of 1C6401.
YES
NO Is the supply voltage | yo
of SV fed to pin (16)
of IC6401 ?
YES
Is REC FM signal outputted at pin
(8) of 1C6401 ?
YES
Check AH-MZ comector.
Is there "H" level at
pins (3) and (4) of
1C6401 ?
YES
Check REC/PB
control circuit, BIAS
8V and Hi-Fi CTL.
Check line between from pin (14)
of 1C6301 (TP6301) to pin (26) of
Check line between from pin (23)
Check TU PC 5V
line.
Replace 1C6401.