Section IV. PREVENTIVE MAINTENANCE

TM 55-4920-325-14&P

Section IV. PREVENTIVE MAINTENANCE

3-8. Cleaning.

dipped in ethyl alcohol (item 1, table 1-4). A dry,

lint-free cloth should be used to clean contacts.

The removal of grease, dirt, dust and grime on

the test set is necessary for the proper operation

3-9. Lubrication.

of the test set. All items, except electrical con-

No lubrication of the test set is required at the

tacts, should be wiped with a clean, lint-free cloth

organizational level of maintenance.

Section V. OPERATIONAL CHECKOUT

3-10. Performance Checks.

made to the Corrective Action column to correct

the malfunction. The steps given in table 3-2 must

Performance checks are given in table 3-2. Per-

be performed in the sequence indicated, in order

formance checks are used to determine if the test

to ensure proper system build-up and provide an

set is operating within its operating limits. If the

immediate means of detecting a fault. Before

test set does not meet the requirements estab-

starting the performance checks given in table 3-

Iished in the Normal Indication column of table 3-

2, the Power ON/OFF switch (2, figure 2-1) must

2, a trouble is indicated and reference should be

be set to OFF.

Table 3-2. Performance Checks

Normal

Abnormal

Corrective

Action

Indication

Action

Step

NOTE

Numbers in parentheses refer to index numbers of figure 2-1.

Power ON indi-

Power ON indica-

Replace Power

Set Power

tor (3) does not

ON/OFF

cater (3)

ON indicator

switch (2)

lights.

light.

(3), 1/2 AMP

to ON.

fuse (1), or

power cable if

defective. If

normal indica-

tion cannot be

obtained, refer

test set to

higher level of

maintenance.

Set meghom-

MEGOHMMETER

See paragraph

meter

indicator (14)

2-8f. If

RANGE

reads O meg-

does not read

proper read-

SELECTOR

ohms (ZERO

zero meg-

ing cannot be

switch (17)

CALIBRATE

ohms.

obtained,

to ZERO

mark).

refer test set

CAL.

to higher

level of

maintenance.

3-5