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FM VCO Adjustment
Procedure :
FM RF SSG
Carrier frequency : 98MHz
IF frequency : According to
the color of CF1.
Modulation : no modulation
Output level : 0.1V (100dB)
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98MHz.
3. Adjust the RV1, so that the frequency counter reading becomes
76,000Hz.
Specification Value :
Digital frequency counter
75,950 – 76,050 Hz
0.01 µ F
IC1 Pin 4
33k Ω
IC1 Pin 7
Adjustment Location : MAIN board (Component side)
AM Tracking
Adjustment
L3
CT1 (3/4)
L3
ANT 1
L4
CT1 (4/4)
AM Frequency Coverage
Adjustment
0.01 µ F
telescpic
antenna
input(ANT1)
Frequency counter
+
–
FM Frequency Coverage
Adjustment
FM Tracking
CT1 (2/4)
Adjustment
L1
CT1 (1/4)
CF1
16
15
18
11
RV1
L2
4
T1
L4
1
30
IC701
RV1 : FM VCO
Adjustment
CF1
color
mark
L2
T2 : AM IF Adjustment
T2
IC1
IC1 : VCO
T1 : FM IF
Adjustment
Frequency counter
— 9 —
BLACK
10.64MHz
BLUE
10.67MHz
RED
10.70MHz
ORANGE
10.73MHz
WHITE
10.76MHz
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