TM 11-5895-846-14
f.
Release the latches on the slide rails and
remove the power supply from the rack.
g. Replace the unit by performing steps a through
f above in reverse order.
Section VIII. MAINTENANCE OF ELECTRONIC FREQUENCY CONVERTER CV-3199/TSC
ERR position. Check the status of the OUT OF LOCK
5-22.
Scope
indicator. If the OUT OF LOCK indicator is illuminated,
adjust the FREQ TUNE control to the frequency settings
a. This
section
covers
instructions
and
on the FREQ SELECT MHz switch settings. As the
procedures for testing and fault isolation, adjustment,
correct frequency is reached, the OUT OF LOCK
and removal and replacement. The test procedures are
indicator should extinguish. If the indicator will not
based on the use of built-in-test-equipment (BITE), and
extinguish, proceed to step (7) below.
no additional support or test equipment is required.
NOTE
b. See figure 3-6 for location of controls and
indicators. See figures 5-13, 5-14, and 5-16 for location
Care should be taken to ensure that
of the upconverter adjustments, modules, and other
the OUT OF LOCK indicator is
components. See figure 5-15 for location of submodules
extinguished when the FREQ TUNE
within the frequency synthesizer module. Refer to
control is reading the same frequency
as that indicated by the FREQ
to paragraph 5-26 for replacement of synthesizer
SELECT MHz switches.
modules, and to paragraph 5-27 for the replacement of
(5) Fine tune the FREQ TUNE control to
the upconverter.
obtain a mid-scale indication on the MONITOR meter. If
WARNING
a mid-scale indication cannot be obtained, proceed to
DANGEROUS VOLTAGES EXIST IN
step (7) below.
THIS EQUIPMENT. Do not attempt
(6) Place the SYNTH MON switch to each of
any removal or replacement unless
the following positions and observe the MONITOR meter
the equipment is in a nonoperating
for a correct indication. If an incorrect indication is
observed, proceed to step (7) below. If a correct
condition and all power circuit
indication is observed at all positions, proceed to b
breakers on the power distribution
below.
panel are in the OFF position.
Position
Indication (Meter Units)
5-23.
Testing and Fault Isolation
SHF LO
15 to 35 M.U.
630 MHz
15 to 35 M.U.
a.
Testing the Upconverter
SP GEN
15 to 45 M.U.
(1) Place the power circuit breaker to the on
1 MHz
15 to 35 M.U.
position and observe that the associated power indicator
1 KHz
15 to 35 M.U.
is illuminated.
125 KHz
15 to 35 M.U.
(2) Place the MONITOR switch to each of the
10 KHz
15 to 35 M.U.
following positions and observe the monitor meter for a
FREQ STD
15 to 35 M.U.
correct indication. If an incorrect indication is observed,
IF
10 to 45 M.U.
proceed to step (3) below. If a correct indication is
(7) Test the frequency synthesizer module Al
observed at all positions, proceed to step (4) below.
d below.
b. Upconverter with 70 MHz modem.
Position
Indication (Meter Units)
(1) Place the MONITOR switch to the IF IN
+24 V x 1
22 to 26 M.U.
position.
+ 15 V x 0.5
28 to 32 M.U.
NOTE
- 15 V x 0.5
28 to 32 M.U.
The APC (automatic power control)
+6 V x 0.2
28 to 32 M.U.
switch on the SHF filter/detector
-6 V x 0.2
28 to 32 M.U.
(3) Replace power supply module PS1, (para
module A5 should be in the ON
position (fig. 5-13).
(4) Place the monitor switch to the SYNTH
position. Place the SYNTH MONITOR switch to the φ
5-34
