Daewoo DV6T712D, Service Manual

Page: 23 / 58

22
TROUBLESHOOTING
No Hi-Fi Audio in
record/playback mode
IC251 pin#2, 3,
IC251 pin#6, 7,
IC251 pin#10, 11,
IC251 pin#4,5
IC251 pin#8, 9.
Is there Audio signal?
REC ‘H’ BASE voltage
at Q201 is 5V?
Check Input AV1 JACK.
Check Input AV-F JACK.
Check ICD03(DVD) Block.
Check Input AV2 JACK.
Replace IC251.
YES
NO
NO
NO
Is there FM OSC signal at IC251
pin #36?
Is there FM OSC signal at
P301 pin#2?
Check IC601 pin#22.
C. No Hi-Fi Audio in record/playback mode(REC MODE)
YES
YES
Replace DRUM.
NO
HEAD Cleaning.
YES
D. No sound in broadcasting (Stereo)
Is 5V obtained at IC121
pin#1, 11, 33?
Oscillation of IC121 pin#5,6?
YES
NO
NO
NO
YES
YES
Is SIF output from RF101
pin#22 to IC121 pin#2?
Is AUDIO output at IC121
pin#26, 27?
Check IC251 pin#2,3.
Check POWER circuit.
Exchange X121.
Check RF101.
Exchange IC121.
NO