DAEWOO ELECTRONICS DV-F882DY-C, Service Manual

Page: 11 / 90

4. SOUND CARRIER
• Connection Method
• Adjustment Procedure
1) 12V to pin No. 1, and GND to pin No. 2 of P102
5V to pin No. 3, and GND to pin No. 1 of P101
2) Connect the signal generator output to pin 3 and GND to pin 2 of 102.
3) Connect the oscilloscope to pin NO.15 of IC102.
4) Adjust L108 to obtain the minimum Noise, minimum Level of pin NO.15 of IC102.
8
P102
L104
L105
IC101
L101
TP1
L108
TP2
L103
Z101
TP6 TP7
IC102
TP3
L109
P101
IC103
L110
TP4
minimum
noise
level
CH-1
Oscilloscope
GND OUT
PIF PCB (Component Side)
SIGNAL
GENERATOR
fc: 38.9MHz, fm: 15.625KHz (30% AM Modulation)
Output level: 80dBµV (75
Ω
loaded)
#3
#2
#2
Adjustment Parts Checking Point Measuring Equipment Condition of Adj. Input Signal
L190 IC102 #15
Oscilloscope
EE Mode
Refer to the
Signal Gen. followings