Sony Walkman WM-FX855, Service Manual

Page: 9 / 35

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TUNER SECTION
AM SECTION
Setup:
BAND switch: AM
AM RF signal
generator
Put the lead-wire
antenna close to
the set.
400 Hz 30 %
AM modulation
Output level: as low as possible
FM SECTION
Setup:
BAND switch: FM
FM RF signal
generator
TP1 (ANT)
TP23 (ANT GND)
(see page 10)
0.01
µ
F
TUNER Board
1 kHz 100 % FM modulation
frequency devition
±
75 kHz
Output level: as low as possible
level meter
2
REMOTE jack
32
Ω
set
Connection:
AM Frequency coveage adjustment
digital voltmeter
TUNER Board
TP21 (VT)
(see page10) +
—
Caution:
Before the FM measurement, remove a chip ceramic capacitor C22
in the ANT line. Reconnect it after measure ment.
•
For the tracking adjustment, repeat is 2 or 3 times, then end
with adjustment of trimmer capacitor.
[TUNER Board]
C22
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2 450 kHz
AM FREQUENCY COVERAGE ADJUSTMEN
Adjusting device Frequency display
Digital Voltmeter
reading
T1 531 kHz 1.3 ± 0.05 V
Confirm 1,710 kHz 7.95 ± 0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L8 621 kHz
CT1 1,404 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 10.7 MHz