Sanyo M7790K - TUNER ADJUSTMENT; EQUIPMENT REQUIRED; MW ALIGNMENT; SW1 ALIGNMENT

EQUIPMENT REQUIRED
» AM Standard Signal Generator
FM Standard Signal Generator
Generator Scope
Stereo Signal Generator
Loop Antenna
Ceramic Capacitor (1 OpF)
Carbon Resistor (830kQ)
VTVM
Frequency Counter
NOTE:
Use an alignment tool with plas
MW ALIGNMENT
TUNER ADJUSTMENT
Dummy Antenna (3800/1 OpF) for SW2
Dummy Antenna (75Q, unbalanced type) for FM
tic grip for all adjustments.
Oscilloscope
Dummy Load (3.20)
Alignment Tool
Before performing the adjustment, set the switches and
controls as follows:
* Function Switch ............cccccccccccseccceeeeeeuenes RADIO
* Mode Switch .............c ccc cece eeeeeceneee see eaes MONO
*) “TONE: CONtrOlS: a. s.aascciceseeseeleeesvawiunosisde odtanee’ Max.
* Balance Control ..................... Center (click position)
* Volume Control ............c cece ccees eee eseeeeneeenees Center
Standard Test Frequency 400Hz and Modulation 30% at AM
Frequency
Alignment
Calibration terminal of
1 of IF gene-scope.
for AM
60cm away f
bar antenna.
Calibration
of
Tuning Range | of AM signal
generator.
LU Connections
INPUT OUTPUT
Connect loop
antenna to output
Place loop antenna
Connect loop
antenna tc output
Connect input
terminal of gene-
scope to detector
output terminals
(CN1-1 and CN1-2,
or CN1-3). rom
of Signal
Generator
455kHz
Tuning Dial
Setting Remarks
Adjustments
Obtain symmetrical curve
and maximum amplitude.
Low End T3, T4 and T5
Connect VTVM with
3.20 dummy load
and oscilloscope
Adjustment Place loop antenna | to Phones/Ext.
of 60cm away from Speaker jack.
Tracking bar antenna.
510kHz
1,670kHz
600kHz
pale nne
Obtain sine-wave of 400Hz
and maximum amplitude.
High End
600kHz
1,400kHz
L4-3 (bar ant. coil)
SW1 ALIGNMENT
Alignment
Calibration
of
Tuning Range
of AM signal
generator.
Connect loop
antenna to output
Connections
OUTPUT
Connect VTVM with
3.20 dummy load
and oscilloscope
Adjustment Place loop antenna to Phones/Ext.
of 60cm away from Speaker jack.
Tracking bar antenna.
an
Repeat the above steps until no further change is noted in any of the adjustments.
Frequency
of Signal
Generator
Tuning Dial
Setting
Low End Obtain sine-wave of 400Hz
and maximum amplitude.
High End
2.5MHz
L4-1
(bar
ant.
coil)
Max.
6.5MHz
TC3 (PVC)
Repeat the above steps until no further change is noted in any of the adjustments.