TM 11-6130-227-40
(4) See that the impeller is mounted securely on
(1) See that all parts are mounted securely.
the hub of the lower motor and that it rotates freely
Tighten loose mounting hardware and replace all
and has adequate clearance.
missing parts.
( 5 ) Assure that all wiring is in good condition
(2) Insure that all switch contacts are clean and
and that connections are clean and tight. If
tight clean and tighten, if necessary.
necessary, clean and tighten connections; replace
tifier for evidence of overheating.
TROUBLESHOOTING
WARNING
been localized, check the performance of the
Be
extremely
careful
when
performing
equipment
in
accordance
with
the
equipment
t r o u b l e s h o o t i n g with the power on. Use
performance checklist and the troubleshooting
instructions in TM 11-6130-227-12.
insulated test probes when making
voltage
measurements.
Always
b. Visual Inspection. Before disassembling the
disconnect the ac input cable before
e q u i p m e n t , inspect it. Many defective parts can be
touching any internal part.
identified by sight, touch, or smell. Remove the
p a r t s and wiring carefully for evidence of damage
Troubleshooting at general support includes all the
such as the following
for
techniques
outlined
operator's
and
( 1 ) Loose or broken connections and defective
organizational maintenance and all additional
wiring.
techniques required to isolate a defective part. The
(2) Loose or missing mounting hardware and
maintenance procedure is not complete in itself, but
broken or otherwise physically damaged parts.
supplements
the
procedures
described
in
TM
(3) Blistered, buckled, or discolored rectifier
11-6130-227-12.
plates.
(4) Evidence
3-6. Troubleshooting Procedures
reactor, or blower motor.
The first step in servicing the defective battery
c.
Troubleshooting
Chart. Use
the
trouble-
charger is to sectionalize the fault to a major circuit
s h o o t i n g chart (para 3-7 as an aid in determining
group. The second step is to localize the trouble to
the probable causes of the symptoms of faulty
an individual circuit that is not functioning
operation and the corrective measures required.
properly, and the final step is to isolate the defective
d. Tests. U s e M u l t i m e t e r A N / U S M - 2 2 3 o r
part.
T S - 3 5 2 / U to perform point-to-point continuity tests
a. Operational
Checks. Most trouble in
PP-1660/G can be sectionalized to the ac input
circuits, the transforming circuits, the rectifying
circuits, or the switching circuits by systematic
(fig. 2-2 and 2-3) to
identify circuit components and
checks of the performance of the equipment.
t e s t point and to the wiring diagram (fig. 3-6 and
E x a m i n e the repair tag to see whether the trouble
3-7) for point-to-point wiring and connection points.
has been sectionalized and localized by operator
o r g a n i z a t i o n a l maintenance. If the trouble has not