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Signal Generator or Sweep Generator
Connections
Connect to test
point TP18 through
FM dummy
antenna. Negative
side to test point
TP2.
[*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
Connections Voltage
(+)
9 V
Side...TP5
(-)
Side...TP4
[*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
Radio Dial
Setting
Frequency
63.7 MHz
Variable
capacitor fully
closed.
109.2 MHz
Variable
capacitor fully
opened.
104 MHz
Tune to signal.
Frequency
Counter
(+) Side...TP9 (-)
Side...TP10
Indicator
(Electronic
Voltmeter or
oscilloscope)
Connect vert.
amp. of scope to
test point TP3.
Negative side to
test point TP2.
Adjustment
Point
VR1
Adjust VR3 for 2400 ± 15 Hz on frequency
counter reading. [*3, 4, 5]
Adjustment(Shown
in Fig.1)
L53 (FM OSC
[*2]
Coil)
for
output.
CT50-1 (FM OSC
Trimmer)
CT50-2 (FM ANT
Trimmer)
Remarks
Remarks
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