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A D J U S T M E N T O F T U N E R
o Measuring instruments
* AM signal oscillator (AM-SG)
*
Stereo modulator
* Frequency counter
* AM loop antenna
'
F M s i g n a l o s c i l l a t o r ( F M ' S G )
* Oscilloscope
* AC voltmeter
1. FM-RF Adiustment
1 ) C o n n e c t t h e o u t p u t o f F M ' S G t o a n a n t e n n a t e r m i n a l '
Take the output from a pin 2 of 1C202 and connect it to
the AC voltmeter.
2) Set the frequency of SG to 87.4 MHz. Tune the pointer
of the set to the lowest frequency. Adjust the local
oscillator coil L203 so that 87.4 MHz can be received
from SG. Adiust so that the AC voltmeter registers the
maximum reading'
3l Set the SG frequency to 108.3 MHz. Tune the pointer of
the set to the highest frequency. Adjust the trimmer
capacitor C217 so that 108.3 MHz can be received
from SG. Adjust so that the AC voltmeter regisæn the
maximum reading.
ADJUSTMENT LOCATION DIAG RAM
4) Set the frequency to 88 MHz. Tune the set so that 88
MHz can be received from SG' Adjust tuning coils of
L201 and L2O2 so that the AC voltmeter registers the
maximum reading.
5 ) S e t t h e S G f r e q u e n c y t o 1 0 8 M H z . T u n e t h e s e t s o t h a t
1 0 8 M H z c a n b e r e c e i v e d f r o m S G . A d j u s t t r i m m e r
capacitors ot Ç2O2 and C206 so that the AC voltmeter
registers the maximum reading.
6) Repeat steps 2) through 5).
2. FM.lF, MPX Adjustment
1) Connect the DC voltmeter to pins 7 and 10 of 1C201'
Put the set in a state of not receiving a signal. Adjust
T201 so that the voltmeter reads 0 + 50 mV.
2) Set the SG frequency to 98 MHz' The output should be
6 6 d B , 1 K H z m o n o r a l 1 0 0 % m o d u l a t i o n ' T u n e t h e s e t
so that 98 MHz can be received from SG. Connect a
distortion factor meter to terminals 1 and 2 of J202'
Make sure that the distortion factor is below 1%. lf the
distortion factor exceeds 1%, adiust T201 again.
L2o2
@
F M
c 3 t 7 M W
s203
s20l
s202
LW
MW/FM MODE/MUTING
- 1 2 -
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