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TUNER ADJUSTMENTS
. Use a plastic screw driver for adjustments.
.d
. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage
: DC12.OV
Phones impedance
: 32 ohm
Standard output
: 0.5mW(126mV)
Function switch
: RADIO
PARTS
LOCATION
!
,,
L2103
D
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L
VCT-
J2102
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J2101
TP1(H)
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J2106
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~pin(FM
IF IN)
a
AM
A13.
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Adjusting
Connections
Step
VTVM
Circuit
SG Frequency
Position of "tuning dial
Adjustment
Input
output
Oscilloscope
Closed the output
Connect sweep
terminal by sweep
generator to
1
IF
generator, it place
C2106(H) & .. .
455 kHz
Low
XF213
to L2103.
C2106 (G)
4
2
Tuning
Connect AM SG
Connect VTVM to
517k Hz
Low end
L2104
3
coverage
to Test Loop
speaker terminals
Max.
1750kHz
High end
VCT -4
4
Connect AM SG
Tracking
Connect VTVM to
600 kHz
600 kHz
L2103
5
to Test Loop
speaker terminals
Max.
1400 kHz
1400k Hz
VCT -3
(j
Repeat adjustments
b. FM ADJUSTMENT
BAND
SELECT
SWITCH
: FM
FM Dummy
antenna : 75 ohm unbalance
Adjusting
Connections
Step
SG Frequency
Position of tuning dial
VTVM
Circuit
Adjustment
Input
output
Oscilloscope
Connect sweep
Connect sweep
A
1
IF
generator to
generator to
IC201 @ (H)
C2106 (H)
10.7 MHz
Low
---
& J2102 (G)
& JC2106 (G)
2
Tuning
Connect FM SG
Connect VTVM to
87.0 MHz
Low end
L2102
to TP1 (H) & TP2 (G)
speaker terminals
Max.
3
coverage
109.0
MHz
High
end
VCT-2
4
Connect FM SG
Connect VTVM to
Tracking
toTPl (H) & TP2 (G)
speaker terminals
98.0 MHz
98.0 MHz
VCT-1
Max.
5 ..
Repeat adjustments
-3-
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