— 17 —
4-3. TUNER SECTION
• Switch Location
VOLUME : MAX
MEGA BASS : OFF
SOUND : OFF
BAND : AM
Signal generator
BAND : FM
Signal generator
Adjustment Location : MAIN board (Component side)
(See page 21)
0 dB = 1 µV
Put the lead-wire
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF signal
generator
0.01
µ
F
FM RF signal
generator
telescopic
antenna
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
• 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.
32k
Ω
set
+
–
level meter
J302 (phones)
Frequency Coverage Adjustment
Procedure :
[TUNER BOARD] (Component side)
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
CFT1 1,000kHz (999kHz)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 620kHz (621kHz)
CT2 1,400kHz (1,404kHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 87.5MHz
CT1 108MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
Reading on digital
voltmeter
L4 530kHz (531kHz) 0.85 ± 0.2V
Confirmation 1,710kHz (1,611kHz) 4.8 ± 0.5V
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
Reading on digital
voltmeter
L2 108MHz 4.0 ± 0.2V
Confirmation 87.5MHz 1.55 ± 0.2V
( ) : AEP,UK
( ) : AEP,UK
AM SECTION
FM SECTION
( ) : AEP,UK
Digital Voltmeter
(DC range)
+
–
w
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w
.
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1
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9
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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