TM 9-4931-355-14
3-12. R/T Tester Calibration.
Calibration of the R/T tester must be performed at
depot.
Section IV. TROUBLESHOOTING
substituted to localize the trouble to one of the four
3-13. Troubleshooting the Test Set.
items.
Troubleshooting of the test set is limited to
required for the test set. Figure 3-1 provides the
continuity checks of the test cables and extender cards
schematic diagrams of the test cables and table 3-5
and to visual inspection of the special tools and test
provides the wire list for the extender cards. Table 3-6
equipment. If continual faulty indications are observed
provides the wire list for the branched cable. Refer to
on the RCVR-XMTR STATUS meter of the R/T tester or
TM 9-1240-369-34 for troubleshooting of laser range
on the PFN charge ammeter, a known good R/T tester
finder units.
or PFN charge ammeter, receiver-transmitter unit,
power supply control unit or test cable should be
(Located in back of manual)
Table 3-4. Test Set Troubleshooting
Sequence
Item to be
Corrective action and/or
NO.
inspected
Procedure
paragraph reference
1
All of the mode lamps do not light
Tester cable, or R/T tester.
Check continuity of tester cable. If
on R/T tester.
proper continuity exists, return
R/T tester to depot for repair. If
proper- continuity does not exist,
repair tester cable (para 4-11 ).
2
One or more or more of the mode lamps
R/T tester.
Return R/T tester to depot do for repair.
not light on R/T tester.
3
No indication on the R/T tester
R/T tester.
Return R/T tester to. depot for
RCVR-XMTR STATUS meter
repair.
during receiver sensitivity check or
transmitter output energy check.
4
PFN charge ammeter does not
PFN charge ammeter or PRESS
Return PFN charge, ammeter depot
indicate during transmitter output
TO TEST switch.
for repair.
energy check.
5
Various circuit card assemblies or
Extender card/extender cable.
Perform maintenance checks as
modules do not function properly
described in table 3-1 and repair
when installed in extender card
extender card (para 4-8) or extender
connectors or extender cable
cable (para 4-11).
connectors.
6
Laser range finder does not function
Branched cable.
Perform maintenance checks as
properly during receiver to
described in table 3-1 and repair
transmitter alinement.
3-5
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