TM11-5895-846-14
d. Removal and Replacement of Transient
(10) After replacement, perform the gain
Suppressor Module A4 (fig. 5-21).
b. Removal and Replacement of SHF Drive
(1) On the amplifier/mixer front panel, place
the AC POWER circuit breaker to the off position (down).
(1) On the amplifier/mixer front panel, place
(2) Remove front panel cables from the SHF
the AC POWER circuit breaker to the off position (down).
CHANNEL COMBINER INPUT and the SHF OUTPUT
(2) Remove front panel cables from the SHF
jacks.
CHANNEL COMBINER input and the SHF OUTPUT
(3) Loosen the four captive screws on the
connector.
front panel of the drawer.
(3) Loosen the four captive screws on the
(4) Open the amplifier/mixer drawer.
front panel.
(5) Loosen two captive screws which secure
(4) Open the amplifier/mixer drawer.
module A4 to the mounting bracket.
(5) Remove cable W1 from J1 on the SHF
(6) Unplug module A4 from chassis connector
drive assembly A2, remove cable W5 from AT3, and
J7 and remove the module from the drawer.
remove cable connector P4 from CR1.
(7) Replace module A4 by performing steps
(6) On the front panel, loosen the set screw
(1) through (6) above in reverse order.
e. Removal and Replacement of Power Alarm
on the output level adjustment knob; remove knob and
knob lock from the front panel.
(7) Remove the hex nut securing the output
(1) On the amplifier/mixer front panel, place
level adjustment control to the front panel.
the AC POWER circuit breaker to the off position (down).
(8) Loosen the three captive screws which
(2) Remove front panel cables from the SHF
secure the A2 module to the amplifier/mixer drawer
CHANNEL COMBINER INPUT and the SHF OUTPUT
chassis.
jacks.
(9) Remove the SHF drive assembly module
(3) the four captive screws on the front panel
A2 from the amplifier/mixer drawer.
of the drawer.
(10) Replace the module by performing steps
(4) Open the amplifier/mixer drawer.
(1) through (9) above in reverse order. Replace the
(5) Remove transient suppressor module A4
(step d above).
coaxial and semirigid cables and tighten the connectors
with the torque wrench provided.
(6) Remove module A5 cable plug P1 from
(11) After replacement, perform the gain
chassis connector J8.
(7) On the outside left side of the chassis,
c. Removal and Replacement of FET/TWT
loosen four captive screws which secure module A5 to
Amplifier A3 (fig. 5-21).
the drawer.
(8) Replace module A5 by performing steps
NOTE
(1) through (7) above in reverse order.
Cable W5 with its attenuator is a part
f. Removal and Replacement of SHF Output
of assembly A3.
(1) On the amplifier/mixer front panel, place
(1) On the amplifier/mixer front panel, place
the POWER circuit breaker to the off position (down).
the AC POWER circuit breaker to the off position (down).
(2) Remove front panel cables from the SHF
(2) Remove front panel cables from the SHF
CHANNEL COMBINER inputs and the SHF OUTPUT
CHANNEL COMBINER INPUT and the SHF OUTPUT
connectors.
jacks.
(3) Loosen the four captive screws on the
(3) Loosen the four captive screws on the
front panel.
front panel of the drawer.
(4) Open the amplifier/mixer drawer.
(4) Open the amplifier/mixer drawer.
(5) On module A3, remove cable W5 (with
(5) On module A6 remove cable W6 from J1,
attenuator) from A2J1, cable W6 from A3J2 and power
cable W2 from FL1, cable W4 from AT1, and cable
cable from A3J1.
connector P5 from CR1.
(6) Loosen the eight captive screws which
(6) Loosen the four captive screws which
secure the A3 module to the amplifier/mixer drawer
secure module A6 to the amplifier/mixer drawer chassis.
chassis.
(7) Remove
module
A6
from
the
(7) Remove
module
A3
from
the
amplifier/mixer drawer.
amplifier/mixer drawer.
(8) Replace module A6 by performing steps
(8) Replace the module by performing steps
(1) through (7) above in reverse order. Replace the
(1) through (7) above in reverse order. Replace the
coaxial and semirigid cables and tighten the connectors
coaxial cables and the power cable.
(9) After replacement, perform the gain
5-60