Sony Walkman WM-FX277 - Page 8

8
WM-FX277
TUNER SECTION
AM section
BAND : AM
FM section
BAND :FM
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 1400kHz <1395kHz>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency display
Reading on digtal
voltmeter
L4 530kHz <531kHz>
Adjustment value : 1.2V
Standard value : 1.1–1.3V
Confirmation 1,710kHz <1,602kHz> Standard value : 9V or less
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 620kHz <621kHz>
CT1 1,400kHz <1,395kHz>
FM FREQUENCY COVERAGE ADJUSTMENT
Frequency display Reading on digtal voltmeter
L3 108MHz
Adjustment value : 9.0V
Standard value : 8.7–9.3V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 98MHz
Confirmation 108MHz
Adjustment Location : Main board
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 :
S303
-2
-1
R207
C10
9
C40
IN
E
OUT
C29
C30
R
9
C1
6
JR2
JR4
JR5
R107
FB101
CF2
CP1
FM RF signal
generator
33.75kHz frequency deviation
by 1kHz signal.
Output level :
as low as possible
CP1 IN
0.01
µ F
[MAIN BOARD]
(Side B)
C403
R403
TP
(VT)
GND
R404
C405
C303
C402
TP (VT)
TP (GND)
[MAIN BOARD]
(Side B)
digital voltmeter
(DC range)
no mark : 10kHz step
< > : 9kHz step