- 2 -
TUNER ADJUSTMENTS
Use a plastic screw driver for adjustments.
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage :
DC 12.0V
Phones impedance :
32 ohms
Function switch :
RADIO
a. Parts Location
b. AM Adjustment
BAND SELECT SWITCH: AM.
Step
Adjusting
Tuning
Input Connection
Output Connection
Adjustment
VTVM Oscilloscope
circuit
Frequency
Measurement
Input
Measurement
Output
Parts
OR VT. VOLT.
IC101PIN19(H)
1
IF
999 kHz
AM Sweep
Loop ANT
VTVM
IC101PIN6(E)
T102
(450 KHz)
Genertor
Oscilloscope
2
Tuning
522 KHz
Digital
C131(H),
T101
1.50V+/- 0.05 V
3
Coverage
1611 kHz
Voltmeter
C131(E)
Confirm 7.8V+/-0.8 V
4
603 kHz
AM Signal
VTVM
C146TU(L)
L106
5
Tracking
1404 kHz
Generator
Loop ANT
Oscilloscope
IC101 pin6(E)
TC101
Maximum
b. FM Adjustment
BAND SELECT SWITCH: FM.
FM Dummy Antenna : 75 ohm unbalance
Step
Adjusting
Tuning
Input Connection
Output Connection
Adjustment
VTVM Oscilloscope
circuit
Frequency
Measurement
Input
Measurement
Output
Parts
1
IF
98.0 MHz
FM Sweep
IC101(5)H
VTVM
IC101PIN19(H)
(10.70 MHz)
Genertor
IC101(6) E
Oscilloscope
IC101PIN6(E)
(Non-adjustment)
2
Tuning
87.5 MHz
Digital
C105(H)
L103
2.0V+/- 0.2V
3
Coverage
108 MHz
Voltmeter
C105(E)
4
90.0 MHz
FM Signal
C110 (H)
VTVM
C146TU(L)
L102
5
Tracking
106.0 MHz
Generator
IC101(6)E
Oscilloscope
IC101 pin6(E)
TC102
Confirm6,5V+/- 0.8V
Maximum
