TM 11-5805-23945
Test equipment
Technical manual
Common name
TM 11-2604
1 Test set 1-199.
Test set.
TM 11-5527
Multimeter.
Variable
Power CN-16/U.
TM 11-5540
Electric light
1 Electric Light
Assembly MX-1292/PAQ.
assembly.
a n d rectifier stacks are free of dust,
3-4 Visual Inspection
d i r t , and corrosion.
a. C a r e f u l l y i n s p e c t t h e c i r c u i t e l e m e n t s i n
(4)
Remove each plug-in unit and in-
the
power
supply
before
starting
to
trouble-
spect the plugs and the jacks' from
s h o o t the equipment. In many cases, the cause
w h i c h each unit has been disconnect-
of the trouble is a broken wire, overheated
WI. See that the contacts are clean
resistor,
or
some
similar
defect.
Since
these
and that no parts are damaged.
faults can often be observed during a visual
See that all fastenings are secure.
(5)
check, complex troubleshooting techniques
b. I f t h e c a u s e o f t r o u b l e c a n n o t b e v i s -
u a l l y detected, it is then necessary to use the
f o r evidence of physical damage.
troubleshooting
chart
and
the
plug-in
unit
tinting
procedures
( 1 ) Look for damaged insulation on the
w i r e s and see that all soldered joints
3-5. Troubleshooting Chart
a r e secure.
(2)
See that the power plug is securely
The chart below is based on the opera-
a t t a c h e d and that the prongs are not
tional portion of the quarterly maintenance
bent,
corroded,
or
otherwise
damag-
services
and
inspection
chart
given
in
TM
ed.
11-5805-239-12.
Make
all
continuity
checks
with Multimeter TS-352/U, using the appro-
Inspect
the
resistors
for
signs
of
(3)
overheating,
and
see
that
capacitors
Probable trouble
Procedure
Indication
Item No
No ac power.
Check the input ac voltage at the
1
No output at any output
ac power source, using the
terminal of terminal
board TB1.
Blown ac input fuse F2.
F2 if it is open.
Check to see that the prongs of
Faulty ac plug P3.
P3 are not broken or bent.
Replace the plug if defective.
Faulty ac power cord.
cord. Replace the ac power
cord if defective
Check for secure connections.
Defective ac power
Resolder loose or broken
cord connations.
connections.
Blown or missing dc
Cheek continuity of fuse F1.
6
Dc blown-fuse
output fuse F1.
Replace if open.
indicator lamp
lights.
Defective plug-in
Perform the checks outlined in
unit.
unit is not repairable,
replace with a good one.
3-2