TM 11-6625-820-45
CHAPTER 3
REPAIR AND ALIGNMENT
Section I. REPAIRS
3-1. General Parts Replacement
(2) Lift the front panel away from the
Techniques
test set.
(3) Disconnect the power cable from the
The following general precautions should
chassis.
be observed when replacing parts in this equip-
Note. To allow enough slack to conven-
ment.
i e n t l y work on the test set, the pendant
cables may be pulled through the porthole
nents, solder quickly to allow as little heat con-
in the bottom of test set.
duction as possible, Whenever wiring permits,
b. Removal of Control Unit.
use a heat sink (such as a long-nosed pliers) be-
(1) Loosen the four Dzus fasteners.
tween the solder joint and the component. Use
(2) Pull the control unit away from the
approximately the same length and dress of
front panel of the test set.
leads as used originally.
(3) Disconnect the cable attached to the
b. Use a pencil-type iron with a 25-watt max-
control unit.
imum capacity. If the iron must be used with
ac, use an isolation transformer between the
c. Disassembly of Control Unit. Refer to
iron and the line. Check soldering irons for
T M 115826-226-35 for disassembly pro-
shorts to the iron tip before using.
cedures of Control, Radio Set C-6873/ARN
c. Whenever an electrical part such as a re-
82.
sistor or diode is to be removed, note the exact
d . Removal of OBS Indicator.
position of the component before removing it.
(1) Remove the four screws that hold the
Replace the component in the same position.
OBS indicator to the front panel of
the test set.
3-2. Removal and Replacement Techniques
(2) Pull the OBS indicator away from the
The procedures for removal and disassembly
front panel of the test set.
of the units in the test set are described in para-
(3) Disconnect the cable attached to the
OBS indicator.
assembly, and lubrication techniques are de-
e. Disassembly of OBS Indicator. Refer to
scribed in paragraph 3-4. The procedures for
TM 115826-226-35 for disassembly proce-
disassembly of the aid box are described in
dures of Indicator, Course ID-1347/ARN-82,
or ID-1347A/ARN-82.
techniques are described in paragraph 3-6.
f. Removal of RMI
3-3. Removal and Disassembly Techniques
(1) Remove the four screws that hold the
for Test Sets, Radio TS-2500/ARM-92
RMI to the front panel of the test set.
a n d TS-2500A/ARM-92
(2) Pull the RMI away from the front
a. Removal of Test Set Front Panel
panel of the test set.
(1) Remove the 13 screws from the peri-
(3) Disconnect the cable attached to the
meter of the front panel.
RMI
C h a n g e 2 3-1
