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3. NO SOUND
Check audio output signal of I101 #1
3-1. CN-220N CHASSIS
e
5V
33V
U102
TUNER
T-DATA T-CLOCK
#29 #30
I701
MICOM
#10
#11 #12
XC701
32.768KHz
Check
the crystal
f
Check
Vcc of the sound AMP
R601
SOUND
12V
C681
Audio L - in
C682
Audio R - in
C684
Check
audio signal in
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IF OUT
AFT
#14
Check
IF Vcc (5V)
#27
SDA
#28
SCL
Check
ST-BY
clock/data signal
5V
#2
#3, #13
#14
#4
#1
I601
#5
TDA7266S
#12
#6
TROUBLESHOOTING GUIDE
NG : Go to the figure e
OK : Go to the figure f
SF101
SAW FILTER
#5
#6
#10
#3
#8
#52
#54
I101
#11
#12
#9
Check
FM filter circuit
Check
audio signal out
L out
C605
R out
C605
earphone
L:Mute / H:Normal
Micom #40
C683
Audio MUTE
Q601
H:Mute L:Normal
12
APPENDIX
Check
IF AGC voltage
Check
SIF output signal
If no signal,
then change I101
Check
SIF input signal
5V
Check
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