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Removal and Replacement of Frequency Selector
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Removal and Replacement of Frequency Multiplier-Amplifier Assembly


(3) Connect plug P1401 to jack JL407
down and remove the four Phillips-
(fig. 43).
head screws and lockwashers that
(4) Replace the power supply as di-
fasten the dc case blower (fig. 44)
rected in TM 11-5820-222-20.
to the case.
b. Replacement.
(1) Align the dc case blower (fig. 44)
120. Removal and Replacement of the Dc
with the four mounting holes on the
Case Blower, Part of Receiver-
bottom of Receiver-Transmitter
Transmitter Case CY-2557/VRC-24
Case CY-2557/VRC-24.
(2) Insert and tighten the four screws
a. Removal.
and lockwashers in the mounting
(1) Remove the RT-323/VRC-24 and
holes.
its case from mounting MT-1436/U
(3) Replace the RT-323/VRC-24 and
as described in TM 11-5820-222-
its case as described in TM 11-
20.
5820-222-20.
(2) Turn the rt unit and case upside
Section II. REPAIRS
121. General Parts Replacement Techniques
122. Removal and Replacement of First
Oscillator Assembly
Most of the parts inRadioSetsAN/VRC-
a. Removal.
24 and AN/TRC-68 can be easily reached
and replaced. However, careless replace-
Caution: Index the capacitor tuning shaft
merit of parts can cause new troubles.Ob-
and crystal switching gears shown in figure
serve the following precautions when re-
90 so that they can be easily synchronized
placing parts:
before replacement. Mark the relative
positions of the gears with a light pencil
a. Whenever a faulty part, such as a
mark.
resistor, a capacitor, or a coil is to be
removed, note the exact position of the
(1) Remove the uhf injection subunit
part before removing it. Replace the part
from the rt unit main frame (para
with an identical new part, placed in the
108 a ).
same position. This precaution is particu-
(2) Remove the six Phillips-head
larly important for replacement of parts
screws and lockwashers marked 1
in stages that operate at high and ultrahigh
(fig. 92) and slide the cover plate
frequencies.
off the rear of the first oscillator
assembly.
b. Whenever faulty parts with multiple
(3) Unsolder the junction marked 1
contacts,  such as wafer switches and
transformers, are removed for replace-
(4) Unsolder the red, brown, and green
ment, mark or tag each contact for identi-
leads to the junctions shown in
fication.
(5) Remove the screw marked 3 (fig.
When soldering a replacement part
C.
90) and the two screws marked 1
within a subunit, use the lowest wattage
(fig. 91). Pull the first oscillator
soldering iron that will do the job. When
assembly away from the frequency
soldering a replacement part (such as a
multiplier-amplifier subchassis.
variable glass capacitor), grasp the lead
between the part and the connection with a
b. Replacement.
pair of pliers before applying heat. This
(1) Mesh the first oscillator and fre-
will prevent the soldering iron heat from
quency multiplier-amplifier as-
damaging the part.
semblies so that the capacitor


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