DAEWOO ELECTRONICS DV-F952N, Service Manual

Page: 8 / 62

3. AFT COIL
• Connection Method
• Adjustment Procedure
1) 12V to pin No.1, and GND to Pin No 2. of 102
2) Connect the signal generator output to pin 3 and GND to pin 2 of P102.
3) Connect the Test circuit to pin No. 7 of P102
4) Connect the oscilloscope to “A” point and GND
5) Adjust L105 to obtain 2.3V DC Voltage at the "A" point
8
P102
L104
L105
IC101
#3
#2
L101
TP1
L108
TP2
L103
Z101
TP6 TP7
IC102
TP3
L109
P101
IC103
L110
TP4
2.3±0.5V
CH-1
Oscilloscope
GND OUT
#3
#7
PIF PCB (Component Side)
#2
#7
SIGNAL
GENERATOR
fc: 38.9MHz, fm: 15.625KHz (30% AM Modulation)
Output level: 80dBµV (75
Ω
loaded)
43k
Ω
33k
Ω
18k
Ω
"A"
Vcc+12V
GND
(Test circuit)
Adjustment Parts Checking Point Measuring Equipment Condition of Adj. Input Signal
L105 “A” point
Oscilloscope
EE Mode
Refer to the
Signal Gen. followings