TM11-5895-846-14
(9) After replacement, perform the gain
(3) Loosen the four captive screws on the
adjustment procedure of paragraph 5.36.
front panel of the drawer.
g. Removal and Replacement of Power Monitor
(4) Open the amplifier/mixer drawer.
(5) Remove the four U bracket mounting
screws holding PS1 and PS2 to the side wall of the
(1) On the amplifier/mixer front panel, place
amplifier/mixer drawer.
the AC POWER circuit breaker to the off position (down).
(6) Unplug the defective power supply from
(2) Remove front panel cables from the SHF
the U bracket.
CHANNEL COMBINER INPUT and the SHF OUTPUT
(7) Replace the module by performing steps
jacks.
(1) through (6) above in reverse order.
3. Loosen the four captive screws on the
i Removal and Replacement of A6CR1.
front panel of the drawer.
(1) Using a torque wrench, disconnect the
(4) Open the amplifier/mixer drawer.
coaxial cable connected to A6CR1.
(5) Remove two cable connectors from
(2) Using a torque wrench, disconnect A6CR1
module A7 (one from each end of module).
from A6DC1.
(6) Remove two screws and lockwashers
(3) Replace A6CR1 by performing steps (1)
which secure the module A7 mounting bracket to the top
and (2) above using the torque wrench.
of the chassis shelf.
(7) From the underside of the chassis remove
5-38. Removal and Replacement of the Amplifier
two screws and lockwashers which secure the module
Mixer.
A7 clamp to the chassis shelf.
(8) Remove the module from the drawer.
a. On the amplifier/mixer front panel, place the AC
(9) Remove the mounting brackets from the
POWER circuit breaker to the OFF position (down).
removed module and install them on the replacement
b. Remove front panel cables from the SHF
module.
CHANNEL COMBINER input cables, and the SHF
(10) Replace module A7 by performing steps
OUTPUT connectors.
(1) through (8) above in reverse order.
c. Loosen the four captive screws on the front
h. Removal and Replacement of Power Supply
panel.
d. Open the amplifier/mixer drawer.
(1) On the amplifier/mixer front panel, place
e. On the rear panel, remove the power cable from
the AC POWER circuit breaker tQ the off position
connector J6 and the ground wire from terminal E1 (fig.
(down).
(2) Remove front panel cables from the SHF
f. Release the latches on the slide rails and
CHANNEL COMBINER INPUT and the SHF OUTPUT
remove the amplifer/mixer from the rack.
jacks.
g. Replace the amplifier/mixer drawer by
performing steps a through f above in reverse order.
Section XI. MAINTENANCE OF LNA CONTROL/TRANSLATOR
5-39. Scope
WARNING
a. This section covers instructions and procedures
DANGEROUS VOLTAGES EXIST IN
for testing and isolation, and removal and replacement.
THIS EQUIPMENT.
Do not attempt
The test procedures are based on the use of built-in-test-
any removal or replacement unless
equipment (BITE) and no additional support or test
the equipment is in a nonoperating
equipment is required.
condition and all power circuit
b. See figure 3-5 for location of controls and
breakers on the power distribution
indicators and figures 5-22 and 5-23 for location of
panel are in the OFF position.
modules and other components. Refer to paragraph 5-
41 for replacement of LNA control/translator modules
5-40.
Testing Fault Isolation.
and to paragraph 5-42 for replacement of the LNA
control/translator.
5-61
