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FM МРХ Section
16
The
SX-636
incorporates
a PLL demodulator
circuit. This adjustment
should only be made when MPX IC has been replaced.
This
adjustment
should
be
made
after
completion
of FM
section
adjustment.
Switch positions on the SX-636:
EUNCIEONS
;
шег»
a
m uM
FM
EMMBIBINGS
I
neces end
43 OFF (pressed in)
POWER:
ilem
AM
ON
Connection of instruments:
FM Signal Generator (FM SG) ....
Connect
to FM ANTENNA
termi-
nals through 3009 dummy antenna.
MPX Signal Generator (MPX SG) . . Connect
to FM SG's external mo-
dulator terminals.
ОвеШовроре
л» „зе
е»
у» Connect
horizontal
input to MPX
SG's
PILOT
OUT
terminals
and
vertical input to No. 18 terminal of
tuner assembly.
Distortion meter
. XINE
TREE
Connect to TAPE REC jack.
Tune FM SG and SX-636
to dial readings of 98МН2.
Set MPX SG to +67.5kHz deviation at 1kHz for left and right channels
and FM SG output to 60dB.
Produce a Lissajous pattern on oscilloscope and adjust VR1 to make the
pattern still.
Set MPX SG to +67.5kHz deviation at 1kHz for left and right channels
and to +7.5kHz deviation for 19kHz pilot signal. Set FM SG output to
60dB.
Adjust T4 to minimize distortion of audio frequencies for left or right
channel.
TUNER ASSEMBLY
(AWE-046)
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