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,r--..
ION 5
ALIGNMENT AND TROUBLESHOOTING
5-1
EQUIPMENT REQUIRED BUT NOT SUPPLIED
1. Oscilloscope, DC coupled, triggered, dual trace, horizontal input
mi n.
10
MH z
BIN.
2.
gital
Voltmeter
3.
Audio Generator
4.
Frequency Counter
5.
S
Genera tor
6. SeA
Generator
7.
FM Signal Generator with Cali
RF
Attenuator
8. Distortion Anal
9.
Assorted
les
and hand
tools.
NOTE:
DO NOT ATTEMPT TROUBLESHOOTING AND ALIGNMENT OF THIS UNIT WITHOUT
ADEQUATE TOOLS AND
EQUIPMENT.
Before starting al ignment of this
unit.
veri
that the three
supply
volta
are present and correct.
5-2 PLL AND TOTAL
ER
ALIGNMENT
(A2
sembly)
1.
Place MOD PEAK Thumbwheel (Al
) to 100.
2.
Measure vol
A2U17
(TP1), this voltage should be
+
.OOV -.lSV
3.
Measure voltage at A2U18-6 (
).
Adjust A2R69 until this volta
has the same magnitude but opposite pol
of s
(2)
4.
Measure
tage on center arm of A2R83.
Adjust A2R83 un
1 its
vol
is
30mv
hi
than that in step
(2)
(
.03V).
5.
voltage on center arm of A2R86.
Adjust A2R86 until
its
voltage is 30mv lower than that in step 5-2 (3) (-3.03V).
6.
s
NEG
button on A1S4A.
7.
Adjust A2Rl
until TOTAL MOD meter (AIM1)
is
8.
Apply a 400 Hz, 4Vp-p sine wave to
COMP IN (AIJ13).
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