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Figure 3-10. Special Jumper Cable for RF Circuits Maintenance (Sheet 3 of 3)
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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 4-2. Radar Test Set AN/TPM-25A Controls


TM 11-4920-296-14&P
INTERMEDIATE TESTING PROCEDURES USING RADAR TEST SET AN/TPM-25A
4-1. GENERAL
abnormal indications are observed for the receiver sensitiv-
ity check (2), or for the transmitter power check (5),
4-2. This section contains the intermediate testing pro-
refer to table 4-4 and make the appropriate adjustments.
cedures and instructions for Transponder Set Test Set
If the adjustment procedure cannot be correctly performed
AN/AW-378. Information is included to check out the
or if other indications are incorrect, proceed to Section 3,
main functions of the test set.
paragraph 3-9 Troubleshooting, to isolate that faulty
module.
4-3. TEST EQUIPMENT REQUIRED
4-8. Mode 4 testing procedures of the test set will be
4-4. Table 4-1 lists the test equipment required for inter
performed at the end of the table 4-3 in the checkout
mediate testing procedures of the test set.
procedures numbered 8-11. and 4-4 give the corresponding
4-5. INTERMEDIATE CHECKOUT
test setups. These Mode 4 checks are: (8) Pretrigger; (9)
PROCEDURES
Interrogation video; (10) SLS pulse; and (11) GTC signal.
Figure 4-5 provides the fabrication and wiring details for
4-6. Table 4-2 lists the AN/TPM-25A standard switch
the Mode 4 connector.
settings for tests conducted on the AN/APM-378. Individual
tests will indicate change from this listed standard.
4-9. If all are correct (as indicated in table 4-3), and the
AN/APM-378 responds correctly to all of the input signals
4-7. Table 4-3 lists the test and procedures required for
designated, the AN/APM-378 test set is proven to be fully
confirming that the test set is operating correctly. Figures
operational.
and 4-2 provide various test setups used in conjunction
with the procedures of table 4-3. These checks should be
4-10. The preliminary Tests and Preliminary Setup given
perfomed after repair actions. The intermediate checkout
in table 4-3 allow adequate warm-up time for the test set;
is divided infections which check for: (1) Power supply
make preliminary lamp tests and control settings prior
voltages; (2) Receiver sensitivity; (3) Receiver frequency
to actually preforming operational checkout. After the pre-
and bandwidth; (4) Receiver reference code, emergency
liminary procedures/tests have been performed the inter-
and I/P function, (5) Transmitter power; (6) Transmitter
mediate checkout procedures may be performed.
frequency; and (7) Transmitter plus characteristics. If
Change 1


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