Vco Frequency Adjustment - Sharp GF-320A Service Manual

FM IF/RF ADJUSTMENT
FM mono
SIGNAL
400 Hz, 30%. FM modulated.
GENERATOR
TEST
STAGE
1
IF
frequency
Detection
Repeat steps 1 and 2 until no further improvement can
be made.
Band frequency
coverage
109 MHz Highest
5
frequency
6 Repeat steps 4 and 5 until no further improvement can
be made.
7 88 MHz
108 MHz 108 MHz
9 Repeat steps 7 and 8 until no further improvement can
be made.

VCO FREQUENCY ADJUSTMENT

SIGNAL
400 Hz, 30%. FM modulated
GENERATOR
FM mono position FM stereo position (unmodulated)
98 MHz at 98 MHz
60 dB
All manuals and user guides at all-guides.com
10.7 MHz
AD-
JUST- REMARKS
1. Using a minus
driver, turn
the core of
clockwise
before taking
it out of the
bobbin.
2. Adjust for
curve.
Adjust for best
"S" curve.
FM Signal
Generator
TC2 maximal output.
Adjust for
maximal
FM Signal
output.
Generator
Adjust for
38.00 kHz + 100 Hz.
Figure 7-l FM IF
Figure 7-2 IF CURVE
Rod Antenna
Unit
Dummy
(See Figure 7-6)
Figure 74 FM RF
Rod Antenna
Dummy
Figure 7-5 VCO FREQUENCY
To Telescopic Rod Antenna
To Chassis GND
Figure 7-6 FM DUMMY
Oscilloscope
Figure 7-3 FM S CURVE
Electronic
External
Voltmeter
Speaker
Electronic