Read Sony HCD-GRX2 / HCD-RX33 / MHC-GRX2 / MHC-RX33 Service Manual online
— 12 —
FM Tuned Level Adjustment
set
Procedure:
1.
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.
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.
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.
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.
capacitors.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] — Component side —
JK501
JK101
L105
TC102
L104
IC101
L102
L103
TC101
SFR101
IC102
TP1
IC103
AM
Tracking
Tracking
AM Tuning
Voltage
Voltage
FM Tuning
Voltage
Voltage
FM
Tracking
Tracking
FM Tuned Level
Carrier frequency : 90 MHz, 106 MHz
Modulation
Modulation
: AUDIO 1kHz, 75kHz deviation (100%)
Output level
: 20 dB (at 75
Ω
open)
FM RF SSG
Carrier frequency : 98 MHz
Modulation
Modulation
: AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level
: 28 dB (at 75
Ω
open)
FM ANTENNA terminal
(JK101)
(JK101)
75
Ω
coaxial
FM ANTENNA terminal (JK101)
SPEAKER terminal (JK501)
FM RF SSG
set
oscilloscope
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