— 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
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)
+
–
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