Daewoo SD-8100 Service Manual
Also see for SD-8100: Owner's manual
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19TROUBLESHOOTINGNo sound in AV-F E-EmodeIs there Audio at IC253pin#2,12 in AV-F mode?Is AV-F Audio signal outputat IC253 pin#14,15?Is there AV-F Audio at IC252pin#5,14?Is 12V obtained at IC253pin#16?YESIC601 pin#27A.Mute is Lor H?Check POWER circuit.A.d. AV-F E-EYESNONONOCheck signal flow circuitIC251 , IC252.Is 12V obtained at IC252pin#16?Is AV-F Audio signal output atIC252 pin#3,13? Check POWER circuit.NOYESNOIC601 pin#31 is L?pin21 is H?Is about 3.5V obtained atIC252 pin#9?Is about 8V obtained atIC252 pin#10?YESReplace IC252.Check IC601.CheckR923,R924,R925,R926NONOC at Q904 is L or H?YESCheckIC601.Check Output JACK.Check Q904,Q905,R937, R938, R939H HLL YESYESIC601 pin#32 is L? Check IC601.NOIs 3.5V obtained at IC253pin#10,11? Check R298, R299,R646, R647NOCheck Input JACK.(FRONT AV)Replace IC253 |
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