B. No Hi-Fi Playback audio(PLAY MODE)C. No Hi-Fi playback in record/playback mode (REC MODE)
NOCheck input LINE1 JACK.
Are there Audio signal
Check input LINE2 JACK.
Is 12V obtained at IC251 pin#34?at IC251 pin#4~9?
Check ICD03(DVD).
NO
YESCheck POWER circuit.YES
Is FM OSC signal at IC251NO
Is 5V obtained at IC251 pin#40?pin#36?Replace IC251
YES
NOCheck A.SW at IC501Is FM OSC signal at P401 pin#2?Replace DRUM.NO
Is Audio signal at IC251 pin#41?
pin#19.
YES
YES
HEAD CLEANING.
Is Audio signal output at IC251NOAre CLK and DATA obtained atYES
pin#16,17?IC251 pin#42,43?Replace IC251.
YES
D. No NORMAL AUDIO playback (PLAY MODE)
Is Audio signal output at IC601 pinNOComparing with switching table, are SWA, B CTL SIGNAL
#3, 13?right at IC601 pin #9,10?
NOVoltage at IC251 pin#34 is 12V?
Is there normal Audio signal at
YESNOVoltage at IC251 pin#40 and atCheck power circuit.NO
YESIC251 pin#17, 18?
IC301 pin#18 is 5V?
Replace IC601.Check IC501.
Check Output JACK.
YES
Is Playback Audio signal atNO
Check A/C HEAD and IC301
IC301 pin#11?
YES
Is there Playback Normal AudioNO
Replace IC251.
signal at IC251 pin #17,18?
YES
Check Output JACK.
2021 |