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TUNER ADJUSTMENT
Measuring Instruments Required
AM Signal Generator
FM Standard Signal Generator
Generator Scope
Stereo Signal Generator
Loop Antenna
Dummy Antenna (75 ohm, unbalanced type)
VTVM
:
Frequency Counter
Distortion Meter
Oscilloscope
Dummy Load (3.2 ohm)
Alignment Tool
NOTE:
Use an alignment tool with plastic grip for all adjustments.
MW ALIGNMENT
Standard test frequency 400 Hz and modulation 30% at AM
Alignment
of Signal
INPUT
OUTPUT
Generator
455kHz
Low End
T3, T4 and T5
Tuning Dial
Setting
Adjustments
Remarks
Obtain symmetrical curve
and maximum amplitude.
Connect standard
loop antenna to
output terminal of
gene-scope.,
Connect input
terminal of gene-
scope to detector
Calibration
of IF
for AM
Place bar antenna
output.
60 cm away from
(CN1-2 and CN1-1
loop antenna.
or CN1-3)
Obtain sine-wave of 400Hz
and maximum amplitude.
Connect standard
loop antenna to
output of AM signal
generator.
Calibration
of
Tuning Range
Connect
VT VM with
3.20hm dummy load
and oscilloscope to
Adjustment
Place bar antenna
Phones/Ext. Speaker
600 kHz
600kHz | L4 (bar ant. coil)
of
60 cm away from
terminal.
Tracking
loop antenna.
1,400 kHz
1 400 kHz
Repeat the above steps until no further change is noted in any of the adjustment.
SW1 ALIGNMENT
Obtain sine-wave of 400Hz
and maximum amplitude.
Connect standard
Joop antenna to
output of AM signal
Calibration
of
Tuning Range
7.5MHz
High End
TC4
Connect
VT VM with
3.20hm dummy load
generator.
and oscilloscope to
Adjustment
| Place bar antenna
Phones/Ext. Speaker
2.5MHz
2.5MHz | L4-3 (bar ant. coil)
of
60cm away from
terminal.
Tracking
6.5MHz
6.5MHz
TC3 (PVC)
Repeat the above steps until no further change is noted in any of the adjustment.
loop antenna.
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