2-1. Common Tools and Equipment
e. O s c i l l o s c o p e A N / U S M - 2 8 1 C .
f. P o w e r S u p p l y P P - 7 5 4 5 / U .
For authorized common tools and equipment, refer
g. P o w e r S u p p l y P P - 7 5 7 4 / G .
t o the Modified Table of Organization and Equip-
h. V a r i a b l e L o a d D L P 5 0 - 1 5 0 - 3 0 0 0 .
ment (MTOE) applicable to your unit.
i. M e g o h m m e t e r
j. F a n ,
2-2. Special Tools, TMDE, and Support
k. Test Cable (see appx C).
l. Jumper (see appx C).
Special tools, TMDE, and support equipment re-
quired by general support maintenance personnel are
2-3. Repair Parts
Repair parts are listed and illustrated in the repair
a. T o o l Kit, Electronic Equipment TK-100/G.
parts and special tools list (RPSTL), TM
b. R e p a i r Kit, Printed Wiring Board MK-772/U.
1 1 - 6 1 3 0 - 4 2 9 - 4 0 P , covering general support mainte-
c. D i g i t a l V o l t m e t e r A N / G S M - 6 4 B .
nance for this equipment.
d. M u l t i m e t e r M E - 4 5 0 / U .
disconnect the test cable at rear panel plug
Perform the bench tests in tables 2-1 and 2-2 to
P1, or otherwise interrupt the power sup-
d e t e r m i n e whether the converter is operational and
ply to the equipment before touching any
to localize malfunctions. Improper readings obtained
of the internal parts. Ground points of
during bench testing indicate failed components and/
high potential to remove residual volt-
or faulty wiring. Perform all tests and proceed to the
d e t a i l e d troubleshooting information to isolate the
problem to a failed component.
P r o p e r grounding is essential to satisfac-
2-5. Troubleshooting Tables
t o r y operation of the converter. Damage
Table 2-3 contains detailed troubleshooting informa-
tion to isolate malfunctions discovered during bench
t e s t i n g to specific circuits and/or components. Fol-
T h i s equipment is transistorized; observe
l o w the procedures in proper sequence and perform
all cautions to prevent transistor damage.
the corrective actions to return the converter to serv-
Do not make continuity or resistance
i c e a b l e condition.
c h e c k s other than those specified in the
t e s t s . Damage to the transistors and mi-
croelectronic devices, which can impair
W h e n troubleshooting or making repairs
the performance of the equipment, may
o n this equipment be extremely careful.
result if improper battery voltages and po-
High current as high as 22 amperes is
larities are applied.
p r e s e n t in the output power section. Use
insulated test probes when making the re-