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TROUBLESHOOTING GUIDE
3-5) NO SOUND PLAYBACK
ICY01
VCR Y/C
LA71550M
XCS01
32KHz
Check
the crystal
Check
the voltage
ICS01
TIMER/
SYSCON
#65 #67
XS02
16MHz
#35
#36
#38
#39
#37
#34RESET
Vcc(5V)
#98
#99
Vcc(5V)
Vcc(5V)
Check
the waveform
Check
the voltage
(5V)
SCLK
SDATA
Check
the crystal
#16 #17
Check
SCL/SDA signal
CCU12
#81
If no signal,
then change the ICY01.
AUDIO OUT
#39
#75A Vcc
SW Vcc
#12 #11
#72
#95
#71
#26
MDATA
MCLK
Check
MCL/MDA signal
QCU02
Invert PB H
from ICS01#20
REC H,PB L
#90#86
I501
CHROMA
DCT814B
AUTO
BIAS
#88
#51
SOUND
AMP
#1
See the 2-2) TV NO
SOUND
AUDIO HEAD
Check
the voltage
H : QUE/REV/STILL
L : NORMAL PLAY
A.MUTE