Service manual

26
TROUBLESHOOTING GUIDE
3-8) NO EXTERNAL VIDEO / AUDIO
ICY01
VCR Y/C
LA71076AM
XS01
32KHz
Check
the crystal
Check
the voltage
ICS01
TIMER/
SYSCON
#75
XS02
16MHz
#35
#3
6
#3
8
#39
#37
#3
4
RESET
Vcc(5V)
#9
8
#99
Vcc(5V)
Vcc(5V)
Check
the waveform
Check
the voltage
(5V)
INPUT SELCT
Check
the crystal
#55
Check
CTL signal
#3
5
AUDIO OUT
#87
HA Vcc
#12
#11
#72
#7
1
MDATA
MCLK
Check
MCL/MDA signal
#4
2
I501
CHROMA
DCT814B
#7
6
#42
#2
CVS OUT
#9
6
JP01
EXT INPUT
Check
the waveform
AUDIO IN
CVS
IN
Check
the voltage
(5V)
IF Vcc
If CVS/AUDIO no signals,
then change the ICY01.
TV:H, EXT:L
Appendix