Sony Walkman WM-FX488 Service Manual

7
WM-FX488
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 621kHz (620kHz)
CT1 1,395kHz (1,400kHz)
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display Reading on digtal voltmeter
Confirmation 108MHz Standard value : 8.775 to 8.925V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 87.5MHz
Confirmation 108MHz
TUNER SECTION
AM Section
BAND : AM
FM Section
BAND : FM
( ) : 10kHz step
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency display
Reading on digtal
voltmeter
L5 531kHz (530kHz) Standard value : 0.9 – 1.25V
Adjustment Location : Main board (See page 8)
0 dB = 1µV
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
set
16 Ω
phones jack (J301)
level meter
Frequency Coverage Adjustment
Setting :
CT1
IC1
R11
R16
C1
C3
C10
C12
L1
C5
R1
C44
C
2
C15
TP30
D1
C24
C30
R9
R8
R40
C23
1
15
FM RF signal
generator
33.75kHz frequency
deviation by 1kHz signal.
Output level :
as low as possible
TP30
0.01
µ F
MAIN BOARD
(SIDE A)
IC1
R16
C17
C4
C28
C21
C3
C10
2
L3
D3
R6
C712
C11
TP12(VT)
C18
FB1
16
30
MAIN BOARD
(SIDE A)
TP12 (VT)
digital voltmeter
(DC range)
Ver 1.1 2003.01

Sony Walkman WM-FX488 Specifications

Power

power requirements	DC 1.5V, AA Battery x 1
battery life (play)	35 Hours w/Sony Alkaline Battery
battery life (tuner)	40 Hours w/Alkaline Battery

Frequency Range

FM frequency range	87.5-108MHz
AM frequency range	530-1710kHz
TV frequency range	Channels 2-13
Weather Band frequency range	Channels 1-7

Weight and Dimensions

weight	158 g
width	83.6 mm
height	112 mm
depth	28.3 mm