Daewoo CN-400FN, Service Manual, Page: 45 / 49

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TROUBLESHOOTING GUIDE Appendix
3. NO SOUND
(C)
(D)
Check The Output Signal of I701 #57,58
OK : Go To The Figure (D)
NG : Go To The Figure (C)
TU101
TUNER
Z101
SAW FILTER
IF
SCL/SD
33V
5V
CHECK
THE
VOLTAGE
#7,8
I701
CHECK
CLOCK,DATA
#18,1
X701
24.576MHz
CHECK THE
CRYSTAL
5V
3.3V
#22,43,45,63,80
#9,16,86,88
I601
LA42072N
#7 13V
Z101
SAW FILTER
SIF
CHECK THE
VOLTAGE
#33
CHECK THE
VOLTAGE
AUDIO INPUT
#2,4
CHECK THE
INPUT SIGNAL
AUDIO OUTPUT #8,9,11,12
CHECK THE
OUTPUT
SIGNAL
5V #5
#6
MUTE
CHECK THE
MUTE
SIGNAL(H:ON)