Sanyo M7770K - Tuner Adjustment; MW Alignment; SW1 Alignment

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
Alignment
:
of
Signal
Tuning
Dial
INPUT
OUTPUT
Generator
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.