DAEWOO ELECTRONICS DTQ-20J5FC, Service Manual, Page: 34 / 36

13
TROUBLESHOOTING GUIDE
4. CH DON’T STOP
Check the input signal conditions
NG : Loss of signal or weak signal
OK : Go to the figure g
U102
TUNER
I701
MICOM
#11 #12
#29 #30
T-DATA
T-CLOCK
5V 33V
IF OUT
#14
AFT
#27
#28
SDA
SCL
h
AGC IN
XC701
32.768KHz
#10
ST-BY
5V
Check
the crystal
I703
EEPROM
#8
ST-BY
5V
#5 #6
SDA SCL
Check
SDA/SCL
Check
5V/33V LINE
#15
C103
Check
RF AGC Voltage
Check
AFT window Voltage
SF101
SAW FILTER
I101
#11
#12
#10
#4
RF AGC OUTPUT
#49
#48
L501
VCO COIL
Check
VCO coil
2.1V~2.5V