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Table 26. Preventive Maintenance Checks and Services
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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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Table 3-1. Transponder Set Test Set AN/APM-378, Maintenance Test Equipment Required


TM 11-4920-296-14&P
INTERMEDIATE MAINTENANCE INSTRUCTIONS
GENERAL.
3-1.
TROUBLESHOOTING.
This section contains the inter-
3-2.
3-10.  Trouble analysis within the test set
mediate maintenance information for the
is accomplished by use of the trouble anal-
Transponder Set Test Set AN/APM-378,
ysis flow diagrams of figures 3-1 and 3-2,
Information is included for checkout and
and the procedures of tables 3-2 and 3-3.
troubleshooting, to isolate any malfunction
These procedures perform measurements
to a faulty replaceable module or assembly.
in a logical sequence, and enable decisions
Disassembly, cleaning, inspection, and
at each point as to which replaceable module
might be causing a faulty signal/measure-
reassembly data are also given in this
section.
ment. In the trouble analysis diagrams, the
diamond-shaped symbols indicate test steps,
TEST EQUIPMENT REQUIRED.
3-3.
the rectangular symbols indicate equipment
actions taken, and circles represent deci-
Table 3-1 lists the test equipment
3-4.
sion points.
required for troubleshooting of the test set,
at the intermediate maintenance level.
3-11.  Use of the trouble analysis diagram
is as follows, Connect and energize the
test set, and perform test step T1. Use
CHECKOUT.
3-5.
test equipments designated for checkout with
associated troubleshooting analysis table to
Checkout of the test set is accom-
3-6.
determine the parameters for that test. If
plished by means of the self-test features
the measurement/indication is correct, fol-
built into the unit. This type checkout is
low the "good" (G) path from the diamond.
normally performed during each usage of
If the indication or measurement is incor-
the test set, to determine that it is operat-
rect, follow the "not-good"  (NG) path from
ing correctly before actually using it to
the diamond. The G and NG paths will lead
check transponders.
you to the next logical action/test to be
made, or to a circle symbol. Within each
Because of the modular construc-
3-7.
circle, the probable module causing the
tion, and high-reliability circuits used in
fault will be stated; when the trouble analy-
the test set, most faults will be analyzed
sis path has lead to a circle replace the
to a replaceable module. Repair will then
module indicated. Following replacement
consist of replacement of that faulty mod-
of the indicated module, recheck the cir-
ule, and the quick checkout (via self-test)
cuits by by performing the checkout procedures,
used to confirm that the module replace-
or by performing the prior tests (of the
ment has cleared the fault. Recalibration
trouble analysis diagram) which originally
of the test set should be made following any
lead to that replacement.
repair, and at periodic intervals of approx-
imately 6 months of use.
3-12.  The trouble analysis flow diagrams
analyze troubles to the replaceable modules
If satisfactory results are obtained
of the test set. The majority of malfunc-
3-8.
tions of the equipment will be analysed to
from the performance of the calibration
then the AN/APM-
such modules. However, it is possible for
produres,
a trouble to occur within the power supply
378 test set may be considered to be fully
circuits, or with individual controls or
operational.


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