Section III. REPAIRS
35. General Parts Replacement
36. Removal and Replacement of Front
Techniques
Panel and Chassis
All the parts of Test Set, Radio AN/
a. Removal. Remove the front panel
VRM-1 can be reached and replaced easily
without special procedures. The following
and chassis from the ease as follows:
precautions apply specifically to the AN/
(1) Loosen the eight captive screws
VRM-1.
to the case.
a. Use a pencil-type soldering iron with
a 25-watt maximum capacity. The AN/
(2) Carefully lift the front panel and
VRM-1 contains semiconductor devices
chassis out of the case; be careful
and is transistorized. If the iron must be
not to damage the gasket (fig. 18).
used with ac, use an isolating transformer
b. Replacement. Replace the front panel
between the Iron and the ac line. Do not
and chassis as follows:
use a soldering gun damaging voltages can
(1) Place the front panel gasket in
be induced in Components.
position on the case.
b. When soldering semiconductor leads,
(2) Place the front panel and chassls
solder quickly, wherever wiring permits,
over the chassis well (test jack A
next to the case cable compartment)
use a heat sink (such as long-nosed pliers)
between the soldered joint and the semi-
and carefully lower the front panel
conductor.
and chassis into the chassis well
Figue
12.
Test
Set,
Radio
TS-177/VRM-1,
upper
left
oblique
view.
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