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TUNER SECTION
[AM]
Setting:
Function
: RADIO
Band switch : AM
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM]
Setting:
Function
: RADIO
Band switch : FM
FM RF signal
generator
0.01 µ F
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
MAIN board
TP53 (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
• Remove FM antenna in FM adjustments.
ELECTRICAL ADJUSTMENTS
0 dB=1 µV
level meter
32 Ω
+
set
–
2 jack (J301)
MAIN board
level meter
TP12 (FM IN)
32 Ω
+
set
–
2 jack (J301)
digital voltmeter
100 k Ω
SECTION 5
Adjust for a maximum reading on level meter
T1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
Confirmation
Adjust for a maximum reading on level meter
L3
CT2
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2
Confirmation
Adjust for a maximum reading on level meter
L1
CT1
Adjustment Location: MAIN board (See page 11)
FM VCO Adjustment
Setting:
FM RF SSG
Carrier frequency: 98 MHz
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
Procedure:
1. Connect the frequency counter to TP7, 8 as shown the figure
below.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz reading on the frequency counter.
Specified Value: 75.95 to 76.05 kHz
MAIN board
TP8 (VCO)
TP7 (+B)
Adjustment Location: MAIN board (See page 13)
– 9 –
AM IF ADJUSTMENT
450 kHz
530 kHz
1,710 kHz
AM TRACKING ADJUSTMENT
580 kHz
1,490 kHz
87.5 MHz
108 MHz
FM TRACKING ADJUSTMENT
87.5 MHz
108 MHz
MAIN board
TP12 (FM IN)
0.01 µ F
frequency counter
1 µ F
+
+
–
33 k Ω
2.8 V
9.5V
2.1 V
8.5 V
set
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