Section III. TROUBLESHOOTING

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

( 3 ) Inspect the transformer, reactor, and rec-

wiring that shows evidence of deterioration.

tifier for evidence of overheating.

Section

III.

TROUBLESHOOTING

WARNING

been localized, check the performance of the

extremely

careful

when

performing

equipment

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

cover of the case (para 3-12) and inspect all internal

3 - 5 . Scope of Troubleshooting

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

(3) Blistered, buckled, or discolored rectifier

11-6130-227-12.

plates.

(4) Evidence

of overheated transformer,

3-6. Troubleshooting Procedures

reactor, or blower motor.

The first step in servicing the defective battery

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

a n d to make voltage and resistance measurements

PP-1660/G can be sectionalized to the ac input

( p a r a 3-9 and 3-10) to determine the condition of

circuits, the transforming circuits, the rectifying

individual parts. Refer to the schematic diagram

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

3-2