Cleaning - TM-11-6625-537-14-10029

TM 11-6625 -537-14-1

4-6. Cleaning

(2) Blow out the dust and any foreign matter

from the electronic voltmeter with a low-pressure

a. Exterior of Equipment. Inspect the exterior

dry air blower. Be sure that the binding posts, the

of the equipment. The exterior surfaces should be

wiring, and all the switches are completely free of

free of dust, dirt, grease, and fungus.

dust and foreign matter.

(1) Remove the dust and the loose dirt with a

(3) Clean t h e b i n d i n g p o s t s , t h e i n -

clean soft cloth.

sulators, and the front panel with a rag saturated

WARNING

in anhydrous denatured ethyl alcohol.

The fumes of trichloroethane are toxic.

CAUTION

Provide thorough ventilation whenever

U s e only anhydrous denatured ethyl

used. DO NOT use near an open flame,

alcohol when cleaning the insulators of

T r i c h l o r o e t h a n e is not flammable, but

t h e switches. Other cleaning solvents

exposure of the fumes to an open flame

may react with the insulating material in

converts the fumes to highly toxic,

these switches.

dangerous gases.

( 4 ) When necessary, wash the exposed

(2) Remove the grease, fungus, and ground-

insulating material of all switches with a small,

in dirt from the case; use a cloth dampened (not

stiff, bristled brush and the anhydrous denatured

wet) with trichloroethane.

ethyl alcohol.

(3) Remove the dust or dirt from the plugs

(5) After washing, recoat the exposed switch

and the jacks with a brush.

i n s u l a t i n g material with a solution of Dow

CAUTION

Corning 200 having a viscosity between 50 and

Do not press on the meter face (glass)

2 0 0 centistokes (10 percent solution of 100

when cleaning; the meter may become

viscosity grade Dow Corning 200 in anhydrous

damaged.

denatured ethyl alcohol). This solution will

(4) Clean the front panel, the meter, and the

prevent any leakage due to moisture on these

control knobs; use a soft, clean cloth. If dirt is

surfaces. Do not apply grease or other lubricants

difficult to remove, dampen the cloth with water;

to switch wafers.

m i l d soap may be used for more effective

cleaning.

4-7. Touchup Painting Instructions

b. Interior of Equipment. P e r f o r m t h e

Remove rust and corrosion from metal surfaces

procedures given in (1) through (5) below to

by lightly sanding them with fine sandpaper.

remove the dust and any foreign matter and to

Brush two thin coats of paint on the bare metal to

prevent leakage.

protect it from further corrosion. Refer to the

(1) Remove the two securing screws at the

a p p l i c a b l e cleaning and refinishing practices

rear of the electronic voltmeter and pull the

specified in TB 746-10.

chassis out of the case.

Section

Ill.

TROUBLESHOOTING

4-8. Visual Inspection

procedure for the systematic check of equipment

by the organizational repairman. All the

When the equipment fails to operate properly,

corrective measures that can be performed are

turn off the power and check for the conditions

given in the Corrective action column. When

listed below. Inspection will save repair time and

using the troubleshooting chart, follow each step

may also avoid further damage. Do not check any

in the order given. If the corrective measures

item with the power on.

i n d i c a t e d do not restore the equipment per-

a. Wrong settings of switches and controls.

formance, troubleshooting is required by a higher

b. Damaged, disconnected, or poorly con-

maintenance repair category. Note on the repair

nected power cord.

t a g how the equipment performed and the

c . Burnt-out fuse. (This condition usually

corrective measures that were taken.

indicates some other fault. )

4-9. Troubleshooting

The troubleshooting chart (table 4-4) provides a

4-3,