Signal Generator or Sweep Generator
Radio Dial
Setting
Indicator
(Electronic
Voltmeter or
oscilloscope)
Adjustment(Shown
in Fig.1)
Remarks
Connections
Frequency
Connect to test
point TP18 through
FM dummy
antenna. Negative
side to test point
TP2.
63.7 MHz
Variable
capacitor fully
closed.
Connect vert.
amp. of scope to
test point TP3.
Negative side to
test point TP2.
L53 (FM OSC
Coil)
[*2]
for
output.
109.2 MHz
Variable
capacitor fully
opened.
CT50-1 (FM OSC
Trimmer)
104 MHz
Tune to signal.
CT50-2 (FM ANT
Trimmer)
[*2] Three output response will be present; proper tuning is the outer frequency.
- BATTERY BACK-UP CIRCUIT ADJUSTMENT (NOTE: Disconnect AC
power cord)
DC Power Supply
Frequency
Counter
Adjustment
Point
Remarks
Connections Voltage
(+)
Side...TP5
(-)
Side...TP4
9 V
(+) Side...TP9 (-)
Side...TP10
VR1
Adjust VR3 for 2400 ± 15 Hz on frequency
counter reading. [*3, 4, 5]
[*3] Connect 1 pF capacitor to the test
point TP9.
[*4] Amplify its output signal by using AF
Amp.
[*5] Measure the frequency.
- FM DATA MEASUREMENT
Note: The FM IC (Mixer) has to be isolated from the
antenna when doing FM measurement.
1. De-soldered one connection of coupling capacitor that is connected to
the antenna
2. Input the signal directly to the coupling capacitor.
3. Solder back the capacitor after the data has been taken
2.2. Alignment Points