TM 11-6625-1696-12
b. Troubleshooting
Item No.
symptom
Probable cause
Checks and Corrective measure
41
Abnormal meter indication ............
Defective switch S14 ....................
Higher category maintenance re-
quired.
42
+ 12 V lamp does not illuminate....
Defective lamp .............................
Check lamp, replace if necessary.
43
Abnormal meter indication ............
Defective switch S15 ....................
Higher category maintenance
required.
44
Abnormal insulation test ...............
Defective component....................
Discard defective component.
45
Abnormal insulation test ...............
Open or shorted connector or .......
Disassemble connector and repair
conductor.
or replace broken conductor.
Section III. ORGANIZATIONAL REPLACEMENT OF
ASSEMBLIES
5-10.
Replacement of Semiconductor Device
5-9.
General Replacement Procedures
Assembly, Diode 220-801225-000 (fig. 5-11)
CAUTIONS
Do not twist an assembly to ease
removal. Always lift assemblies directly
panel (para 5-9b) and lay it face downward. Locate
away from mounting surfaces. Be sure
semiconductor device assembly, diode 220-801225-000.
b. Loosen the two captive screws on both
connectors are properly mated before
securing an assembly. Do not attempt
diode matrix plugs and disconnect the plugs.
c. Loosen the four captive screws that secure
to force connectors together with
retaining screws or sliding locks.
the diode matrix to the panel and remove the matrix.
a.
d. Aline the four captive screws of the
Transmitting test facility assemblies
replacement procedures are given in paragraphs 5-10
replacement diode matrix with the mounting posts and
Receiver test facility assemblies
tighten the screws.
e. Connect the two diode matrix plugs to their
replacement procedures are given in paragraphs 5-18
mating connectors and tighten the four captive scrrews.
f.
replacement procedures are given in paragraphs 5-27
Replace the front panel (para 5-8c).
b. Remove the transmitter or receiver test
5-11.
Replacement of Time Delay Assembly 457-
facility front panel as follows:
533 (fig. 5-11)
(1) Loosen the eight captive screws that
secure the front panel to the rear chassis.
panel (para 5-9b) and lay it face downward. Locate time
(2) Carefully pull the front panel directly
delay assembly 457-533.
away from the rear chassis as far as the slides permit.
b. Loosen the two captive screws on the time
(3) Lift the front panel out of the slides.
delay assembly plug and disconnect the plug.
c. Replace the transmitter or receiver test
c. Loosen the three captive screws that
facility front panel as follows:
secure the time delay assembly to the panel and
CAUTION
remove the assembly.
When replacing the transmitter front
d. Aline the three captive screws of the
panel, be sure that the short flexible
replacement time delay assembly with the mounting
hose at the rear of the panel fits over
posts and tighten the screws.
the rigid tube protruding from the
e. Connect the time delay assembly plug to its
chassis.
mating connector and tighten the two captive screws.
(1) Place the front panel hooks on the
f.
Replace the front panel (para 5-9c).
slide posts.
(2) Carefully push the front panel toward
the rear chassis until the connectors mate.
(3) Tighten the eight captive securing screws.
5-13
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