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SECTION 3
ELECTRICAL ADJUSTMENTS
0 dB = 1 µV
[AM]
Setting:
Band switch: AM
[FM]
Setting:
Band switch: FM
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
• Remove FM antenna in FM adjustments.
Adjustment Location: MAIN board (See page 8)
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
8
Ω
MAIN board TP (SP GND)
MAIN board
TP (SP +)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
MAIN board TP (SP GND)
MAIN board
TP (SP +)
set
MAIN board
TP (FM-IN)
8
Ω
0.01
µ
F
MAIN board
TP (FM GND)
digital voltmeter
100 k
Ω
TP (VT)
TP (FM GND)
+
–
MAIN board
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 450 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L5 531 kHz 2.65 V ± 0.1 V
Confirmation 1,602 kHz Less than 9.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 621 kHz
TC1 1,404 kHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4 87.5 MHz 3 V ± 0.1 V
Confirmation 108 MHz Less than 11.8 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 87.5 MHz
TC3 108 MHz
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