Sony WM-FX495 Service Manual page 9

TUNER SECTION 0 dB = 1µV
AM section
BAND : AM
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM section
BAND :FM
0.01 µ F
TP61
[MAIN BOARD]
(Side B)
US
TP61
US
set
phones jack (J301)
Put the lead-wire
antenna close to
the set.
FM RF signal
generator
33.75kHz frequency deviation
by 1kHz signal.
Output level :
as low as possible
FERR
level meter
16 Ω
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency display
L5 530kHz <531kHz>
Confirmation 1,710kHz <1,602kHz> Standard value : 8.5V or less
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT1 1,400kHz <1,395kHz>
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display
Confirmation 87.5MHz
108MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
Adjustment Location : Main board
Frequency Coverage Adjustment
Setting :
[MAIN BOARD]
(Side A)
TP2 (GND)
TP2 (GND)
WM-FX495
no mark : US
< > : AEP
Reading on digtal
voltmeter
Adjustment value : 1.2V
Standard value : 1.05–1.35V
620kHz <621kHz>
Reading on digtal voltmeter
Adjustment value : 4.6V
Standard value : 4.1–5.1V
Adjustment value : 7.8V
Standard value : 6.8–8.8V
98.0MHz
digital voltmeter
(DC range)
TP5 (VT)
TP5 (VT)
9