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APPENDIX
TROUBLESHOOTING GUIDE
3-2. CN-220C CHASSIS
e
33V
TUNER
T-DATA T-CLOCK
#29 #30
MICOM
#10
XC701
32.768KHz
Check
the crystal
f
Check
Vcc of the sound AMP
SOUND
12V
Audio - in
Check
audio signal in
5V
U102
IF OUT
AFT
#14
I701
#27
SDA
#28
SCL
#11 #12
Check
ST-BY
clock/data signal
5V
R601
#1
C602
#4
I601
C603
TDA7267A
SF101
SAW FILTER
#5
#10
#8
Check
IF Vcc (5V)
I101
#11
#12
Check
FM filter circuit
Check
audio signal out
#2
C605
SPEAKER
#6
C604
14
Check
#6
IF AGC voltage
#3
#52
#54
If no signal,
then change I101
Check
SIF input signal
#9
Check
L:Mute / H:Normal
Micom #40
Audio MUTE
Q601
H:Mute L:Normal
Check
SIF output signal
5V
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