Sharp VC-90ET - Page 57

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No HiFi sound playback
Is EE sound heard ? NO
YES
Is playback envelope signal NO
outputted at pin @)) of 1C6304 ?
YES
Is playback envel
inputted to pins
1C6303 ?
NO
ope signal
Coane Got
Yes
Is playback audio singal
outputted at pins @ and Gof
(C6303 ?
NO
YES
Line coupling.
HiFi TROUBLESHOOTING (2)
Refer to the EE system
troubleshooting chart.
FLOW CHART NO. 20
Do the REC/PB control circuit, NO I 4
1€6304 Qo) function ? Reciece eee:
Check the line from pins Qdot
1€6303.
1€6304 to pins @3)and GQ) of
Do the peripheral circuits around
pins @ and Gd)of 16303
function ?
ls audio signa! outputted at pins (3and 4d of 1C6302 ?
RF coupling.
ts audio signal outputted at pin Gof 1C6302 ?
Audio signal output mode selection.
Pin @9 of 1C6302 = Pin. Gd)of 1C6302
CIC ee CHC
rich
Line coupling.
RF coupling.
yes
NO
Check the line ranging from pins (3) and @4)of 1C6302 to the audio output terminal.
Check the line ranging from pin of 1€6302 to the audio input terminal of the RF converter.
Replace !C6303.
NO Replace !C6302.
HiFi TROUBLESHOOTING (3)
No HIFl sound recording
ts EE sound heard ?
YES
Refer to the EE system
troubleshooting chart.
Is REC FM signal outputted at
pins @ and (TP6310) of
1C6303 ?
Replace 1C6303.
Check the line ranging from pins
@2) and G1 (TP6310) of 1C6303
topin @), @) of 1C6304.
Is REC FM signal inputted to pin
@ @oficesoa?
Is the supply voltage of
9 V fed to pin @d) of
1€6304 ?
Check the PC9V
Is REC FM signal outputted at pin
line.
© of 1€6304 ?
Check the connector BC-ZB.
Replace IC6304.
FLOW CHART NO. 21
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