— 12 —
FM Tuned Level Adjustment
set
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
FM Tracking Adjustment
Procedure:
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 CT101 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 —
Carrier frequency : 90 MHz, 106 MHz
Modulation
: AUDIO 1kHz, 75kHz deviation (100%)
Output level
: 20 dB (at 75
Ω
open)
FM RF SSG
Carrier frequency : 98 MHz
Modulation
: AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level
: 28 dB (at 75
Ω
open)
FM ANTENNA terminal
(JK101)
75
Ω
coaxial
SFR101
FM Tyned Level
AM Tuning
Voltage
IC103
TP1
IC102
L105
IC101
CT102
L103
AM
Tracking
L104
L102
CT101
FM
Tracking
JK101
FM Tuning
Voltage
JK301
FM ANTENNA terminal (JK101)
SPEAKER terminal (JK301)
FM RF SSG
set
oscilloscope
Содержание HCD-GRX3
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