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Figure 3-5. RF Module, Test T21 Setup Diagram
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TM-11-4920-296-14-P Transponder Set Test Set AN/APM-378 (NSN 4920-00-134-1533) Manual
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WIRING/SCHEMATIC DATA.


TM 11-4920-296-14&P
exercised when inserting the printed-circuit
3-27. INSPECTION.
modules into their positions in the card cage,
3-28. No special inspection procedures are
to prevent damage to the connectors, and
required for the test set. Table 3-4 lists
ensure that they are fully seated in their
certain types of defects which can be checked
connectors.  Match the module reference
for, during normal servicing of the equip-
designators marked on each module with its
ment, or during normal usage.
marked-slot in the card cage.
3-29. REPAIR.
3-35. When assembling the case to the front
3-30.  The test set uses nonreparable mod-
panel/chassis assembly, use care to prevent
ule assemblies for most of its circuits. Re-
damage to the sealing gasket between them.
pair of the equipment is accomplished by
Before reassembly of these items, perform
replacement of the faulty digital module or
the calibration checkout and adjustment pro-
submodule of the rf module assembly. The
cedures, if required.
only other repair to the equipment consists
of normal type replacement of piece parts
on the chassis and front-panel assemblies.
3-36.
ADJUSTMENT.
No unconventional techniques are required
for these repairs.
3-37.  Adjustment of the test set consists
of potentiometer adjustments in the rf mod-
3-31. LIMITS.
ule A1.  These adjustments control the
3-32. There are no specific limits of wear
receiver sensitivity, and the transmitter
and tolerances for the mechanical portions
power of the circuits. These adjustments
of this test set. Replacement or servicing
should be made only in conjunction with
should be accomplished whenever wear
the calibration procedures,
causes incorrect operation, confirmed by
the intermediate testimg procedures of
TESTING AND CALIBRATION.
3-33. ASSEMBLY.
3-38.
3-34 Assembly of the components of the
3-39.
equipment, following disassembly and re-
Intermediate testing procedures
pair, is in most cases obvious from refer-
for checkout after repair are contained
ence to the illustrations of Section 6 (IPB),
in Section 4.  F o r calibration, refer
and to the hardware itself. Care should be
to TB 11-4920-296-45 (to be published).
Table 3-4. Inspection Suggestions
DEFECT
ITEM
Mechanical . . . . . . . . . . . . , . . . . . Broken knobs, switches
Stiff or erratic movement
Missing or damaged seals
Broken wiring, contacts
Bent contacts
Missing mounting hardware
Evidence of arcing/shorting
Electrical . . . . . . . . . . . . . . . . . . .
Broken printed circuit tracks
Broken wiring
Damaged contacts
Damaged potting
Damaged lamps
Corrosion of contacts


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