Sony SERVICE MANUAL Service Manual page 10

FM VCO Adjustment
Procedure :
FM RF signal
generator
Carrier frequency : 90MHz
Modulation : no modulation
Output level : 65dB (1.8mV)
1. Connect the frequency counter to 4 and 7 pins of IC1 as shown
the figure below.
2. Turn the set to 98MHz.
3. Adjust RV1 for 75.95kHz – 76.05kHz reading on frequency
counter.
[TUNER BOARD] (Conductor side)
Adjustment Location : Tuner board
L7 : LW Tracking Adjustment
RV1 : FM VCO Adjustment
T2 : FM IF Adjustment
L2 : FM Frequency
Coverage Adjustment
CT2 : FM Frequency
Coverage Adjustment
CT1 : FM Tracking Adjustment
CT3 : MW Tracking Adjustment
telescopic
antenna
terminal
0.01 µ F
set
frequency counter
1 µ F
33k Ω
[TUNER BOARD]
(Component side)
T1 : AM IF Adjustment
L3 : MW Tracking Adjustment
L1 : FM Tracking Adjustment
– 10 –
CT7 : LW Tracking Adjustment
CT6 :
SW Frequency
Coverage Adjustment
L6 :
L4 : MW Frequency
Coverage Adjustment
L8 :
LW Frequency
Coverage Adjustment
CT8 :
L5 :
SW Tracking
Adjustment
CT5 :
CT4 : MW Frequency Coverage
Adjustment