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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 First If. Amplifier Subunit


REPAIRS AND ALIGNMENT
Note. Procedures in this chapter are performed at 3rd echelon unless, otherwise noted.
Section I. REMOVAL AND REPLACEMENT OF SUBUNITS
(2) Disconnect plugs P3, P101, P102,
106. General Instructions
P302, P303, P1101, and P1302
a. When equipment failure occurs, use
(right-side view).
the troubleshooting procedures in chapter
(3) Loosen the three green-headed
5 to localize the trouble. Check applicable
captive screws (1) on the top of the
cables and connectors before attempting
subunit (top view). Remove the cap-
to replace any subunit. Before removing
tive screw, which is about two-
any subunit, channel the rt unit to 399.9 mc.
thirds of the distance from the
At this frequency setting, the frequency
front of the subunit, by inserting
selector tuning shaft couplers are posi-
the screwdriver into the circular
tioned for easy removal and replacement.
cutout in the shield.
(4) Lift the rf and power amplifier sub-
Warning: Turn the POWER control to
unit from the main frame.
OFF before attempting any removal pro-
b. Replacement.
cedures.
(1) Set the coupler on the rf and power
amplifier so that, when viewed
b. To gain access to the subunits, refer
from the front of the subunit, the
to TM 11-5820-222-20 for removal of the
slot in the coupler is vertical and
rt unit from the radio set. The subunits can
the guide pin is in the upper-right
be removed from the rt unit without the use
corner.
of special tools. The retaining hardware on
(2) Seat the subunit on the chassis,
the subunits is painted green for easy lo-
align the captive screws with the
cation. When replacing a subunit, align all
holes, and arrange the subunit cou-
retaining screws with their respective
pler to mesh with the frequency se-
holes before tightening the screws.
lector coupler.
c. All single-connector plugs are color
(3) Tighten the three captive screws
coded. The color of the plug sleeve matches
(1) on the top of the subunit (top
the colored dot alongside the mating jack.
view).
After replacing the subunit, be sure that
(4) Connect plugs P3, P101, P102,
all the jack and plug colors match before
P302, P303, P1101, and P1302
applying power. When disconnecting cable
(right-side view).
connectors, do not twist or bend; pull the
plug connectors straight out of the mating
jacks.
108. Removal and RepIacement of
Uhf Injection Subunit
107. Removal and Replacement of Rf and
a. Removal
Power Amplifier Subunit
(1) Place the rt unit top side up on the
bench.
(2) Disconnect plug P4 (top view).
a. Removal
(3) Disconnect plug P201 (left-side
(1) Place the rt unit top side up on the
view); insert a screwdriver under
bench.


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