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FM Tracking Adjustment
Procedure:
FM RF SSG
set
FM ANTENNA terminal (JK101)
Carrier frequency : 90 MHz, 106 MHz
Modulation
: AUDIO 1kHz, 75kHz deviation (100%)
: 20 dB (at 75 Ω open)
Output level
1.
Tune the set to 90 MHz.
2.
Adjust L102 so that when the waveform on the oscilloscope is
maximum, no noise appears.
3.
Tune the set to 106 MHz.
4.
Adjust TC101 so that when the waveform on the oscilloscope
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] — Component side —
oscilloscope
SPEAKER terminal (JK501)
IC103
FM Tuned Level Adjustment
FM RF SSG
Carrier frequency : 98 MHz
Modulation
: AUDIO 1 kHz, 75 kHz
deviation (100%)
: 28 dB (at 75 Ω open)
Output level
Procedure:
1.
Supply a 28 dB 98 MHz signal from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
AM Tuning
Voltage
FM Tuned Level
L105
SFR101
IC101
IC102
TP1
FM Tuning
Voltage
— 12 —
75 Ω coaxial
FM ANTENNA terminal
(JK101)
JK501
JK101
AM
TC102
Tracking
L104
FM
Tracking
L102
L103
TC101
set
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