Sony HCD-C20 Service Manual page 12

FM Tracking Adjustment
(EXCEPT AEP, UK models)
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
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 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: TUNER board
Adjustment Location
EXCEPT AEP, UK models
[TUNER BOARD] — Component side —
FM Tuning Voltage
JK101
TP2 (VT)
L103
TC101
L102
L104
L105
TC102
AM Tuning Voltage
AM Tracking
oscilloscope
+
–
SPEAKER terminal
FM Tuned Level
SFR101
FM Tracking
CN101
— 12 —
FM Tuned Level Adjustment
FM RF SSG
75 Ω coaxial
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 indica-
tor will change from going off to going on.
Adjustment Location: TUNER board
AEP, UK models
[TUNER BOARD] — Component side —
JK101
U1
TP2 (VT)
AM Tracking
TC102
L104
L105
AM Tuning Voltage
set
FM ANTENNA terminal
(JK101)
FM Tuned Level
SFR101
T101