Sony WM-FS220 Service Manual page 8

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TUNER SECTION
• Switch Location
VOLUME : MAX
MEGA BASS : OFF
AVLS : NORMAL
[AM Tracking Adjustment]
BAND: AM
Signal generator
AM RF signal
generator
30 % amplitude modulation by 400 Hz
signal.
Output level : as low as possible
[FM Tracking Adjustment]
BAND : FM
Signal generator
FM RF signal
generator
TE
L 13942296513
75 kHz(100 %) amplitude modulation
by 1kHz signal.
Output level: as low as possible
set
J301 (phones)
[AM Frequency Coverage Adjustment]
digital voltmeter
MAIN board
TP30(VT)
(GND)
[FM Frequency Coverage Adjustment]
digital voltmeter
MAIN board
www
TP30(VT)
(GND)
.
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0 dB = 1 µV
Put the lead-wire
antenna close to
the set.
0.01 µ F
FM IN
point (TP22)
level meter
16 Ω
+
–
+
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2 9
8
• Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
AM TRACKING ADJUSTMENT
Adjust for maximum reading on level meter.
L1
CT1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a 1.1V ± 0.1Vde reading on digital voltmeter
L2
FM TRACKING ADJUSTMENT
Adjust for maximum reading on level meter.
L3
CT2
Q Q
3 6 7 1 3 1 5
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a 2.5V ± 0.1Vde reading on digital voltmeter
L4
Adjustment Location: Main board (See page 9)
co
.
9 4 2 8
450 kHz
620 kHz
1,400 kHz
530 kHz
86.5 MHz
109.5 MHz
0 5 8 2 9 9 4 2 8
87.5 MHz
m
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