Tuner Section - Sony WM-FX271FP Service Manual

WM-FX271FP

TUNER SECTION

0 dB = 1 µV
• FM Section
Setting:
RADIO ON/OFF switch: ON
BAND switch : FM
FM Tuning Voltage Adjustment
Main board
TP (VT)
FM TUNING VOLTAGE ADJUSTMENT
Adjust for a 8.5 ± 0.3 (14.5 ± 0.5) Vdc reading on digital voltmeter.
108 MHz
FM Tracking Adjustment
FM RF signal
generator
Modulation: 1 kHz, 75 kHz dev. (100%)
Output level: as low as possible
set
i jack (J301)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
87.5 MHz
8
digital
voltmeter
L3
Main board
0.01 µF
(FM RF IN)
(GND)
level meter
(range: 0.5-5 V ac)
16 Ω
L2
• AM Section
Setting:
RADIO ON/OFF switch: ON
BAND switch : AM
AM Tuning Voltage Adjustment
Main board
TP (VT)
AM TUNING VOLTAGE ADJUSTMENT
Adjust for a 1.1 ± 0.1 Vdc reading on digital voltmeter.
530 kHz
AM IF Adjustment, AM Tracking Adjustment
AM RF signal
generator
Modulation: 400Hz, 30%
Output level: as low as possible
set
i jack (J301)
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer ca-
pacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
1,000 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620 kHz
digital
voltmeter
L4
Put the lead-wire
antenna close to
the set.
level meter
(range: 0.5-5 V ac)
16 Ω
T1
CT1
1,400 kHz