Sony WM-FX488 Service Manual page 7

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
TP30
MAIN BOARD
(SIDE A)
C23
set
phones jack (J301)
Put the lead-wire
antenna close to
the set.
FM RF signal
generator
0.01 µ F
33.75kHz frequency
deviation by 1kHz signal.
Output level :
as low as possible
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 531kHz (530kHz)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT1 1,395kHz (1,400kHz)
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display
Confirmation 108MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
Confirmation
Frequency Coverage Adjustment
Setting :
Adjustment Location : Main board (See page 8)
MAIN BOARD
(SIDE A)
WM-FX488
Ver 1.1 2003.01
( ) : 10kHz step
Reading on digtal
voltmeter
Standard value : 0.9 – 1.25V
621kHz (620kHz)
Reading on digtal voltmeter
Standard value : 8.775 to 8.925V
87.5MHz
108MHz
digital voltmeter
(DC range)
TP12 (VT)
7