TM 11-6625-828-45
CHAPTER 3
REPAIRS AND ALIGNMENT
Section I. REPAIRS
3-1.
General Parts Replacement Techniques
CAUTION
Most of the parts in Test Set, Radio AN/AR! 5A can be
Be careful not to damage tone wheels
reached and replaced easily without special procedures.
E101A and E101B during removal and
This section provides remove replacement, disassembly,
replacement procedures.
and reassembly instructions for the RF unit, tone
a.Remove the tone generator from the chassis as
generator, a RF attenuator. The following precaution
follows:
applies when performing the procedures given in this
(1) Place the test set (minus cabinet) in an
section.
upright position on a workbench.
NOTE
(2) If necessary, tag and unsolder the wire
Disconnect Power Cable Assembly
leads connected to terminal board TB103 (fig. 3-2).
CX337/U from the test set for removal
(3) Loosen and remove the three screws and
associated hardware from the vibration mounts.
and disassembly procedures.
(4) Lift and remove the tone generator from
3-2.
Removal of Test Set Chassis from Cabinet
the chassis.
a. Remove test set chassis from its cabin as
(5) Remove the eight screws that retain the
follows:
tone wheel cover, and remove the cover.
(1) Loosen the two.captive screws on t rear of
b. After the tone generator has been removed (a
the cabinet.
above), the unit can be disassembled as follows:
(2) Stand the test set on its back and loose
(1) Use an Allen wrench to loosen three
the eight captive screws on the front panel.
setscrews H158 which secure tone wheels E10O1A and
(3) Grasp the two handles and pull the
E1O1B to the motor shaft (fig.3-2).
chassis out of the cabinet.
CAUTION
b. Replace the test set chassis in its cabin as
follows:
Take care not to damage tone wheel
(1) Stand the cabinet on its back.
E101A and E101B during removal
(2) Lift the chassis by the two handles ( the
procedures.
front panel and lower the chassis into t cabinet.
(2) Use the short end of an Allen wrench to
(3) Start the captive screws on the from
loosen two setscrews H166 (fig.3-9).
panel; then erect the test set cabinet and stay the two
(3) Loosen and remove hexagonal nut H164
captive screws at the rear of the cabinet.
(4) Tighten all screws, especially the tv rear
(4) Loosen and remove knurled nut H165
screws, which provide heat transfer from the chassis to
from coil stud MP161.
the cabinet.
(5) Slide out magnet MP162.
3-3.Removal and Replacement of Tone Generator
(6) Repeat (2) through (5) above for
Tone generator MG101 is mounted on the chassis at the
disassembly of the remaining coil assemblies.
rear of the test set (fig.3-1).
c. Reassemble the tone generator as follows:
(1) Slide magnet MP162 back in coil stud
MP161.
3-1
