Daewoo CN-071, Service Manual

Page: 33 / 49

32
TROUBLESHOOTING GUIDE
3-7) NO RECORD SOUND
Check the waveform of ICY01 #74
NG : GO to the figure
2-2 (TV PART)
OK : GO to the figure n
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
#34 RESET
Vcc(5V)
#98
#99
Vcc(5V)
Vcc(5V)
Check
the voltage
(5V)
SCLK
SDATA
Check
the crystal
#16 #17
Check
SCL/SDA signal
2
#39
#75 A Vcc
SW Vcc
#72
#95
#71
#26
AUDIO
HEAD
Invert REC H
from ICS01#20
REC H,PB L
#83 #81
AUTO
BIAS
#86
Check
the voltage
H : QUE/REV/STILL
L : NORMAL PLAY
A.MUTE
#85
#88
Check
the waveform
3 6
4
#86
AUDIO
ERASE
HEAD
FULL
ERASE
HEAD
Check
the waveform
70KHz
If SINE wave no signal,
then change TU01
TU01
70V
n