Section III. TROUBLESHOOTING - TM-11-5895-932-14-P0057

TM11-5895-932-14&P

Sequence

Item to be Inspected

Procedure

Pluck-out items

Inspect clamps and sealing of pluck out items

Check for wrong. bent or broken parts

Knobs, dials and switches

While making the operating checks. observe that

the mechanical action of each knob dial, and switch

is smooth and free of external or internal binding

4-8. Cleaning

cloth with water. Mild soap may be used to make

a. Remove dust and loose dirt from the exterior

cleaning more effective.

surfaces with a clean, soft cloth.

4-9. Touchup Painting Instructions

WARNING

a When the finish on the exterior of the

The fumes of trichloroethane are toxic.

equipment has been scarred or damaged, corrosion

Provide thorough ventilation whenever

may be prevented by touching-up the surfaces.

used. DO NOT use near an open flame.

Touchup the surface as outlined in (1), (2), and (3)

Trichloroethane is not flammable but

below.

exposure of the fumes to an open flame or

(1) Use No. 000 sandpaper to clean the

hot metal forms highly toxic phosgene gas.

surface down to the bare metal; obtain a bright,

b. Remove grease and ground-in dirt from the

clean finish.

equipment; use a cloth dampened (not wet) with

(2) Sand the area back to solid paint and

trichloroethane.

feather the paint edge that leads to exposed metal.

CAUTION

(3) Wipe the area clean and apply to metal

Do Not use trichloroethane on plastic

surfaces, one coat of zinc chromate metal primer

display windows. Damage to equipment

and two thin finish coats of enamel.

may result.

b. When a touchup paint job is necessary, apply

c. Clean indicator glass; use a soft, clean cloth.

paint with a small brush.

If difficulty in removing dirt occurs, dampen the

Section III. TROUBLESHOOTING

4-10. General

c. Wow the second step or repairing the faulty

item of equipment is accomplished, depends on the

a. Troubleshooting in the PTF involves deter-

maintenance concept for that item. For example, if

mining which item is defective and then locating the

the equipment is maintained by a contractor, PTF

defect in the item or equipment unit. The first ap-

personnel would simply take the equipment out of

proach or step is on a system basis, to find out what

service and notify the contractor. When the

item of equipment is faulty in a series of equipment

equipment is to be maintained at the PTF, it is taken

that make up the communications chain. The typical

out of service and repaired, u s i n g t h e

communication chain would be composed of the

troubleshooting procedure in the applicable

AMME, red/black isolators, modem, the com-

equipment manual.

munication lines, the modem at the remote site, and

d. Troubleshooting procedures in this section

the remote terminal equipment. A fault in any item

cover the procedure used in the first troubleshooting

will degrade or interrupt communications. The first

step, that is, locating the faulty equipment in the

part of a troubleshooting procedure is to determine

communication chain (para 4-11) and a

which is the faulty equipment and remove it from the

troubleshooting chart for a specific equipment item

system and restore communications. The second

which does not have its own manual. The PTF

step is to fix the faulty item of equipment.

equipment item that does not have its own manual is

b. The time required between steps one and two in

the major alarm panel. The troubleshooting chart

the troubleshooting procedure depends on the

(para 4-14) will aid in locating the defective com-

complexity of the trouble. The simpler type troubles

ponent of the faulty major alarm panel. All other

which involve a complete breakdown, such as a

equipment items have their own manuals, listed in

power supply failure which provides an alarm in-

appendix A, which contains troubleshooting data for

dication, can be located almost immediately.

the repair of the item.

Troubles that degrade the signal or increase the

4 -11. Troubleshooting the Communication Channel

errors received in a message require more time

because they require the use of test equipment and

The communication chain which connects the

test procedures.

4-4