Service manual

-51-
TROUBLESHOOTING GUIDE
3-5) NO SOUND PLAYBACK
ICY01
VCR Y/C
LA71076AM
XS01
32KHz
Check
the crystal
Check
the voltage
ICS01
TIMER/
SYSCON
#65
#6
7
XS02
16MHz
#3
5
#36
#38
#39
#37
#3
4
RESET
Vcc(5V)
#98
#9
9
Vcc(5V)
Vcc(5V)
Check
the waveform
Check
the voltage
(5V)
C-ROT Pulse
PB L
Check
the crystal
#1
6
#1
7
Check
SCL/SDA signal
If REC Y/C no signal,
then change the ICY01.
2HEAD DRUM
#21
#5
4
#56/57
#87
HA Vcc
C Vcc
CCD Vcc
Y Vcc
#1
9
#15 #20
#18
Check
waveform(30Hz)
#6
1
#66
#82
#83/84
#94 #9
5
CTL
HEAD
CTL(+)
CTL(-)
Check
the waveform
(30Hz)
#99
#9
7
m
VH SW Pulse
REC H
HA SW Pulse
#85
Check
the crystal
XY01
3.58MHZ
#6
2
Appendix