Daewoo DF-4100, Service Manual

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23
TROUBLESHOOTING
22
TROUBLESHOOTING
B. No NORMAL AUDIO playback in record/playback mode(Check in REC mode)
No Normal Audio playback in
record/playback mode
Are there Audio signal at IC251
pin#2~11?
Is there recording signal at
IC251 pin#21?
Check Input SCART JACK.
Check Input Front JACK.
Check ICD02(DVD)
Check signal flow circuit.
YES
NO
NO
NO
Signal at IC251 pin#21 is transferred to
IC301 pin#13,15,17?
Collect signal at C222 is about
70Vp-p at 70KHz?
Check IC251.
YES
YES
Check Q203.
NO
Check P201 pin#2, 4, 8 and A/C
HEAD.
YES
REC (H) BASE voltage at Q206
is 5V?
Check IC501 pin#45.
NO
YES
C. No Hi-Fi Playback audio(PLAY MODE)
NO
Check A.SW at IC501
pin#19.
Is Audio signal at IC251 pin#41?
Is Audio signal output at IC602 pin
#3, 13?
Is Audio signal output at IC251
pin#16,17?
Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is 5V obtained at IC251 pin#40?
Replace IC251.
YES
YES
Is 12V obtained at IC251 pin#34?
NO
YES
Check POWER circuit.
YES
Check Output JACK.
YES
Check IC602.
NO