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Page Title: Isolating Troubles in T-1054(P)/ GRC-144(V) Primary Power Distribution Circuits
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TM 11-5820-695-35
Item No.
Symptom
Probable trouble
Corrective actions
46
Cable loopback test
a.  Coaxial cable 1A15W7 or
a.
Check coaxial
(TM 11-5820-695-12)
1A15W4.
Cables 1A15W7 and
indicates that Radio
Set AN/GRC-144(V)3
by substitution,
of AN/GRC-144(V)4
using an external
is faulty.
hookup.
b.
Digital data combiner
b.
Check digital data
1A12 chassis defective.
combiner 1A12
chassis by substitution.
3-7. Isolating Troubles in T-1054(P)/ GRC-144(V)
(3)  Remove composite assembly 1A13/
Primary Power Distribution Circuits
b.
Procedure.
WARNING
(1)  Refer to the chart (c below) and
connect the multimeter leads between the two pins
115 vac is present in T-1054(P)/ GRC-
referenced in the troubleshooting chart (para 3-6 ) by
b
144(V).  Do not perform any of the
section and step number. If the troubleshooting chart
continuity or resistance checks given
indicates a section but does not give a step number,
in
this
paragraph
while
the
perform all of the steps given in that section starting with
equipment  is  connected  to  the
step a.
primary power source.
(2)  Observe that multimeter indication is
a.
Preparation of T-1054(P)/GRC-144(V).
within the tolerance specified in the chart for each step.
If it is not, refer to the T-1054(P)/GRC-144(V)
(1)
Remove power supply 1A1 (para 3-22).
interconnecting  diagram  (fig.  5-15  or  5-15.1)  to
determine whether the fault is defective wiring or a
(2)  Remove switch 1A15A8S3 protective
defective circuit element.
cover (fig. 3-4) by removing the two nuts and screw that
secure it to meter panel assembly 1A15A8.
Change 6 3-11


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