TM 11-5895-846-14
This voltage exists at TB1 (fig. 5-23). Exert
(2) On the LNA control/translator; place the
caution if removing the 725 MHz source
POWER circuit breaker to the OFF position.
module A4; especially when loosening the
(3) Loosen the four captive screws on the
rear captive screws. It is highly desirable to
front panel of the unit.
keep the receiver (on-line LNA) on the air.
(4) Open the LNA control/translator drawer.
However, if the tactical situation permits
(5) On the chassis in front of the module,
otherwise, the AC power cable then can be
remove module connector (A4) P1 from chassis
disconnected from J1 on the rear panel.
a. LNA Control Modules A1 and A2. These
connector J9 by loosening the two captive screws on
(A4) P1.
modules are identical and interchangeable.
This
(6) On the module, remove coaxial cable W6
procedure, therefore, applies to both modules. Proceed
from the RF OUT connector J2 (left side top).
as follows:
(7) On the module, remove coaxial cable W5
(1) On the front panel of the module to be
from the RF IN connector J1 (below J2).
removed, place the POWER circuit breaker to the OFF
(8) Loosen the four captive screws which
position.
secure the module to the chassis. Remove the module.
(2) On the module front panel, loosen the four
(9) Replace the module by performing steps
captive screws.
(2) through (8) above in reverse order.
(3) Pull on the handle to withdraw the module
d. Power Supply Module PS1.
far enough out of the unit chassis to reach the connector
(1) Observe the warning notice at the start of
on the rear of the module.
these procedures.
(4) Remove the chassis cable connector from
(2) On the LNA control/translator, place the
the module connector.
POWER circuit breaker to the OFF position.
(5) Remove the module completely.
(3) Loosen the four captive screws on the
(6) Replace the module by performing steps
front panel.
(1) through (5) in reverse order.
b. Translator Module A3.
(4) Open the LNA control/translator drawer.
(5) On the module, loosen the two captive
(1) Observe the warning notice at the start of
screws on chassis cable connector P4 and then remove
these procedures.
it from module connector (PS1)J2.
(2) On the LNA control/translator, place the
(6) On the module, remove chassis cable
power circuit breaker to the OFF position.
connector P1 from module connector (PS1)J1.
(3) Loosen the four captive screws on the
(7) Loosen the four captive screws which
front panel.
secure the module to the chassis. Remove the module.
(4) Open the LNA control/translator drawer.
(8) Replace the module by performing steps
(5) On the module, remove coaxial cable W6
(3) through (7) above in reverse order.
from the FL1 coaxial connector (right-rear top).
(6) On the module atop FL1, loosen the two
captive screws that secure the module to the right-side
5-42.
Removal
and
Replacement
of
LNA
chassis panel.
Control/Translator
(7) At the bottom of the module, loosen the
front and rear captive screws (two).
a. On the LNA control/translator place all
(8) Lift the module out of the chassis to gain
POWER circuit breakers to the OFF position.
access to the two left-rear coaxial connectors.
b. Loosen the four captive screws on the front
(9) Remove coaxial cable W2 from the left-
panel.
rear top coaxial connector (SHF input from variable
c. Open the LNA control/translator drawer.
attenuator AT1).
d. On the rear panel disconnect all rack cables
(10) Remove coaxial cable W3 from the left-
from the connectors. Remove the ground wire from
rear bottom coaxial connector (SHF output to variable
terminal E1 (fig. 5-23).
attenuator AT3). Remove the module.
e. Release the latches on the slide rails and
(11) Replace the module by performing steps
remove the LNA control/translator from the rack.
(2) through (10) above in reverse order.
f.
Replace the LNA control/translator by
c. 725 MHz Source Module A4.
performing steps a through e in reverse order.
(1) Observe the warning notice at the start of
5-65
