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5 DUAL SCA DEMODULATOR ALIGNMENT (A6 Assembly)
1.
alignment of A2 assembly (Section
5~2)
and
(Section
5-3).
2.
Apply an input s
Adjust input
1
kHz. into the COMP
IN
(AIJI3).
PEAK lamp just lights at 100%.
3.
Reduce input level by exactly 20 dB.
4.
Depress SCA 2, SeA 2 MOD button on DISPLAY S
tch
(AlSll).
5.
Adjust A6R25 until CH.A meter (AIM2A) reads 100%.
This
is
equal
10% seA injection.
6.
Repea t
2
&
3 with an
input
signal of 67 kHz.
7.
Depress SeA 1, seA 1 MOD button on DISPLAY
(A1S11) .
switch
8.
Adjust A6R9 until CH. A meter (AIM2A) reads
1
is
is
to 10%
injection.
9.
Reduce SeA inj
to 3%.
Adjust A6R39 until SCA
lamp
(AIDS4) just lights.
10.
Remove
input signal from AIJ13.
Connect a
counter probe
A6U2-9.
Adjust A6R33
until
the
running frequency on
is 80 kHz.
11.
Connect your
kHz generator to
also a low frequency spectrum ana1yzer.
(AIR4) for 10% injection.
IN
(AIJ13) and
Adjust COMP
LEV
12.
Depress SCA
2,
SCA
2 MOD
button on DISPLAY SELECT switch
(A1Sll).
Place
DEV
swi
(AlS9} in 4 kHz position.
. Modula
seA generator with a frequency of 1660 Hz.
Increase
audio input
until
the
92
kHz carrier displayed
on the spectrum ana
nulls for the first
NOTE:
this
is
a
null
function for
4
kHz deviation.
14.
Adjust
A6R15
until CH.
B
meter (AIM2B)
100%.
15.
Repeat steps
lIt
SCA generator,
, 13, and
14
except use a 67 kHz
ect the SCA 1. SCA
MOD
position.
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