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m@ MEASUREMENTS AND ADJUSTMENTS
@ AM/FM
Control positions and equipment used
°AM and FM signal generator (AM and FM-SG)
Stereo modulator
© Distortion analyser
* Oscilloscope
*AC and DC electronic voltmeter (EVM)
Note:
So, do not turn the cores of this parts.
Frequency counter
Choke coil (100 1H)
Resistor (100kQ)
Ceramic capacitor (200pF)
For T201, L202, L301, L302 and T204, adjusted parts are supplied.
AM-RF ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to "AM" position.
3. Place the radio frequency display and signal
generator setting to 612kHz.
Adjust L201 for maximum output.
Place the radio frequency display and signal
generator setting to 1503kHz.
6. Adjust CT201 for maximum output.
7. Repeat steps 3.~6.
Note:
Antenna input level must be as low as possible
being free from AGC.
4.
5.
AM SIGNAL GENERATOR Sie
Modulation...
AC EVM
OSCILLOSCOPE
AM-SG
UNIT
FM MONO DISTORTION ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to "FM" position.
3. Place the radio frequency display and signal
generator setting to 100.10 MHz.
mode is OmV (0+20mV) in 300mV range.
. Repeat steps 4 a few times.
| . Adjust T202 core so that voltage measured in signal
FM SIGNAL GENERATOR CONDITION
Modulation...
}00%
Modulation frequenc:
00 Hz
Output level...
6dB
FM-SG
ES (eames
. Make sure that the distortion factors of Lch and Rch
are nearly the same with each other to minimum.
Note:
The adjusting screwdriver used should be made of
resin.
OC EVM
MPX VCO ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to "FM auto" position.
3. Place the radio dial and signal genarator setting to
100.10 MHz.
. Adjust VR301 for 19kHz+30 Hz on frequency
counter reading.
FM SIGNAL GENERATOR One ITION
Modulation...
Modulation frequency.
Output level.
FREQUENCY COUNTER
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