No Sound - Daewoo DTQ - FSPN Service Manual

3. NO SOUND

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