Sony Walkman WM-FX495, Руководство по обслуживанию

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9
WM-FX495
TUNER SECTION
AM section
BAND : AM
FM section
BAND :FM
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency display
Reading on digtal
voltmeter
L5 530kHz < 531kHz >
Adjustment value : 1.2V
Standard value : 1.05–1.35V
Confirmation 1,710kHz < 1,602kHz > Standard value : 8.5V or less
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 620kHz < 621kHz >
CT1 1,400kHz < 1,395kHz >
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display Reading on digtal voltmeter
Confirmation 87.5MHz Adjustment value : 4.6V
Standard value : 4.1–5.1V
108MHz Adjustment value : 7.8V
Standard value : 6.8–8.8V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7 98.0MHz
Adjustment Location : Main board
0 dB = 1 µ V
• 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 :
L5
L7
FERR
R11 R12
R213
R113
BP1
C3
C42
L16
L6
C1
FB303
FB305
FB307
FB304
FB306
US
US
FM RF signal
generator
33.75kHz frequency deviation
by 1kHz signal.
Output level :
as low as possible
TP61
TP61
0.01 µ F
[MAIN BOARD]
(Side B)
TP42
TP45
TP13
TP9
TP36
TP31
TP32
TP35
TP47
TP64
TP65
TP106
T
TP41
T
R413
C17
C701
R725
R718
R501
R702
R801
R707
R706
FB3
R703
IC701
D801
S301
(TAPE SW)
1
4
S
TP2 (GND)
TP2 (GND)
TP5 (VT)
TP5 (VT)
[MAIN BOARD]
(Side A)
digital voltmeter
(DC range)
no mark : US
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