TM 11-6625-1696-12
f.
e. Position the voltage regulator amplifier
Replace the front panel (para 5-9c).
retaining bracket and insert and tighten the two screws.
5-19.
Replacement of Dummy Load Assembly 456-
5-17.
Replacement of Centrifugal Fan 333-139 (fig.
694 (fig. 5-13)
a. Remove the receiver test facility front
a. Remove the transmitter test facility front
panel (para 5-9b) and lay it face downward. Locate
dummy load assembly 456-694.
panel (para 5-9b).
b. Loosen the two captive screws on the
dummy load plug and disconnect plug.
chassis, locate centrifugal fan 333-139.
c. Loosen the four captive screws that secure
c. Loosen the two captive screws that secure
the dummy load to the panel and remove the dummy
P1 to J3 and disconnect P1.
load.
d. Aline the four captive screws of the
chassis, locate the three nuts that secure the fan to the
replacement dummy load with the mounting posts and
chassis.
e. Remove the three nuts and washers and
tighten the screws.
e. Connect the dummy load plug to its mating
pull the fan directly away from the chassis.
f.
connector and tighten the two captive screws.
Insert the three mounting bolts of the
f.
Replace the front panel (para 5-9c).
replacement fan through the holes in the chassis. Place
the lockwashers on the bolts, start the nuts on the bolts,
5-20. Replacement of Modem 407-188
and tighten the nuts.
g. Connect P1 to J3 and tighten the two
a. Locate the modem and loosen the four
captive screws.
captive screws that secure the modem assembly to the
receiver test facility front panel.
b. Withdraw the modem assembly and loosen
5-18.
Replacement of Semiconductor Device
the two captive screws that secure P7 to J 1.
Assembly Diode 220-801225-000 (fig. 5-13)
Disconnect P7.
c. Connect P7 to J1 on the replacement
a. Remove the receiver test facility front
modem assembly, and tighten the two captive screws.
panel (para 5-9b) and lay it face downward. Locate
d. Insert the modem assembly into the
semiconductor device assembly diode 220-801225-000.
b. Loosen the two captive screws on both
receiver test facility and tighten the four captive screws.
plugs and disconnect the plugs.
5-21.
Replacement
of
Electrical
c. Loosen the four captive screws that secure
Synthesizer 245-800202-000 (fig. 5-14)
the unit to the panel and remove the matrix.
a. At the rear of the receiver test facility
d. Aline the four captive screws of the
chassis,
locate electrical frequency synthesizer
replacement unit with the mounting post and tighten the
245800202-000 and electrical connector plate P1.
screws.
e. Connect the two plugs to their mating con-
nectors and tighten the four captive screws.
5-16
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