Troubleshooting Procedure

TM 11-6130-247-14-1

with water; mild soap may be used for more effective

3-3. Cleaning

cleaning.

Inspect the exterior of the equipment. The exterior

surfaces should be free of dust, grease, and fungus.

3-4. Touchup Painting Instructions

a. Remove dust and loose dirt with a clean, soft

Remove rust and corrosion from metal surfaces by

cloth.

lightly sanding them with fine sandpaper. Brush two

WARNING

thin coats of paint on the bare metal to protect it from

The fumes of trichloroethane are toxic. Pro-

further corrosion. Refer to the applicable cleaning

vide through ventilation whenever used. DO

practices specified in TB 746-10.

NOT use near an open flame. Trichloroethane

is not flammable, but exposure of the fumes

3-5.

Organizational

Troubleshooting

to an open flame converts the fumes to highly

toxic, dangerous gases.

a. General. The troubleshooting procedure will help

the repairman to locate the trouble quickly and apply

b. Remove grease, fungus, and ground-in dirt from

the proper corrective measures. If the measures sug-

the case; use a cloth dampened (not wet) with

gested do not restore normal equipment performance,

trichloroethane.

troubleshooting is required by higher maintenance

c. Remove dirt or dust from plugs and jacks with a

category repairman. Note on the repair tag what cor-

brush.

rective measures were taken and how the equipment

CAUTION

performed at the time of failure.

Do not press on the meter face (glass) when

b. Procedure. Perform the steps in c below. Observe

cleaning; the meter may become damaged.

the equipment operation and perform any corrective

d. Clean the front panel, meters, and control knobs;

measures necessary.

use a soft, clean cloth. If necessary, dampen the cloth

c. Troubkshooting Procedure

Symptom

Corrective measures

Probable cause

1. POWER ON indicator lamp. does not a. Defective fuse F1 . . . . . . . . . . . . . . . . . . .

u. Replace fuse.

light.

b. Defective power lamp . . . . . . . . . . . . . . .

b. Replace lamp.

c. Defective transformer . . . . . . . . . . . . . . .

c. Refer to higher category of maintenance.

2. In voltage mode, VOLT MODE indicator a. Defective lamp . . . . . . . . . . . . . . . . . . . .

a. Replace lamp.

lamp does not light.

b. Defective regulating stage . . . . . . . . . . .

b. Refer to higher category of maintenance.

3. In current mode, CUR MODE indicator a. Defective lamp . . . . . . . . . . . . . . . . . . . .

a. Replace lamp.

lamp does not light.

b. Defective regulating stage . . . . . . . . . . .

b. Refer to higher category of maintenance.

4. Erratic indicator movement of current or

Defective preregulation. . . . . . . . . . . . . . . .

Refer to higher category Of maintenance

voltage meter.

3-6. Removal and Replacement of Lamp

and pull out to expose defective lamp.

(2) Unscrew defective lamp.

(3) Install new lamp and reinstall indicator cover.

a. VOLT and CUR Mode Indicator Lamps.

b. Fuse (F1).

NOTE

(1) Turn fuse cap counterclockwise and pull it out

POWER lamp DS1 replacement is accom-

to expose defective fuse.

plished at higher category of maintenance.

(2) Pull defective fuse out and replace it with a

(1) Turn plastic indicator cover counterclockwise

new one. push new fuse in and install fuse cap.

3-2

Change 1