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Figure 3-8. Test set-up for isolating troubles in voltage regulators Q3 and Q4
Up
TM-11-5820-498-35 Radio Sets AN/VRC-53 AN/VRC-64 AN/GRC-125 and AN/GRC-160 and Amplifier Power Supply GROUPS 0A-3633/GRC and 3633A/GRC Manual
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AM-2060(*)/GRC, ANT. FREQ. CONTROL Switch S2, Removal and Replacement


TM 11-5820-498-35
Section lll. OA-3633(*)GRC, PARTS REMOVAL AND
REPLACEMENT PROCEDURES
the plug-in assembly. Tag each wire with the
3-12. General
a. Most  of the parts of the AM-2060(*)/GRC
identification of the terminal from which it was
may
be
easily
reached,
and
replaced
removed.
(c) Remove the screws, nuts, and spacers
within the equipment without special procedures.
that secure the printed circuit board to the plug-
Paragraphs 3-13 through 3-15 contain removal
and replacement procedure for those parts of
in assembly.
(2) Replacement (fig. 3-15).
the AM-2060(*)/GRC which are not obvious or
(a) Insert a screw and washer through
which require precautionary procedures.
b. No special tools are required, except that in
each of the four mounting holes of the printed
removing transistors and diodes, use a pencil-type
circuit board.
soldering iron with a 25-watt maximum capacity.
(b) Place a spacer over each of the four
With a pair of long-nose pliers, grasp the lead be-
screws.
tween the transistor or diode and the solder con-
(c) Align the mounting holes of the plug-
nection to dissipate the soldering iron heat.
in assembly with the screws in the printed circuit
board and insert the screws through the mount-
3-13. AM-2060(*)/GRC, Plug-In Assembly,
ing holes.
Removal and Replacement
(d) Place a washer and nut on each of the
The plug-in assembly (fig. 3-11) is removed for
four screws and tighten the nut securely.
performing repairs on it (fig. 3-13 and 3-14),
(e) Solder the wires to test points E1
and to gain access to parts under it (fig. 3-12).
through E17 (fig. 3-9). Check each wire tag to
Before proceeding, remove all cable connections
insure the correct replacement.
to the AM­2060(*)/GRC and remove the access
(f) Replace the plug-in assembly in the
plate from the top of the equipment (fig.3-10).
AM­2060(*)/GRC (a(2) above).
a. Plug-In Assembly Removal and Replace-
ment.
3-14. AM-2060(*)/GRC, Loudspeaker LS1
Removal and Replacement
(1) Removal.
(a) Remove the four captive screws that
The loudspeaker is removed from the front panel
hold the plug-in assembly to the chassis (fig.
for testing and replacement, or to gain acc'ess to
the area behind it. Before proceeding, remove all
(b) Grasp the plug-in assembly and pull
cable connections.
the assembly straight up and out of the equip-
a. Removal.
ment.
(1) Remove the four mounting screws that
(2) Replacement.
attach the loudspeaker cover with the loud-
(a) Insert the plug-in assembly so that
of
the
speaker
attached to the front
the plug on the bottom of the assembly mates
AM­2060(*)/GRC. Place the nylon strap at-
with the receptacle J1 on the bottom of the
tached to the SET POWER connector dust cap
AM-2060-(*)/GRC (fig. 3-12).
clear of the loudspeaker area.
(b) Tighten the four captive screws on
(2) Grasp the front of the loudspeaker
the plug-in assembly (fig. 3-11). Make sure that
cover and pull the loudspeaker cover from the
the plug-in assembly is not loose.
loudspeaker by holding LS1 firmly and snapping
(c) Replace the access plate on top of the
the cover off.
AM-2060(*)/GRC.
WARNING
b. Plug-In Assembly Printed Circuit Board,
When soldering and unsoldering the voice
Removal and Replacement. Use the following
coil leads, be careful to prevent the glass por-
tion of the terminals from cracking due to
procedures to remove and replace the printed cir-
excessive heat. Grasp the terminal lead with
cuit board of the plug-in assembly.
a pair of pliers, between the glass bead and
(1) Removal.
the eye of the terminals, before applying
(a) Remove the plug-in assembly (a(1)
heat.
above).
(3) Unsolder the leads that connect the voice
(b) Unsolder the wires attached to test
coil of LS1 to the feedthrough terminals at the
points E1 through E17 (fig. 3-9) on the top of
3-13


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