Chapter 3. DIRECT AND GENERAL SUPPORT MAINTENANCE

TM 11-6780-225-35

CHAPTER 3

DIRECT AND GENERAL SUPPORT MAINTENANCE

Section I. GENERAL

3-1.

Scope of Direct and General Support

Scribe.

Maintenance

Multimeter AN/USM-33.

Cleaning compound.

The maintenance duties assigned to direct and general

Lint free cloth.

support are listed below together with references to the

Mild hand soap.

paragraphs covering the specific maintenance functions.

Multimeter TS-352 B,/U.

The tools, materials, and test equipment are listed in

Pipe joint compound.

paragraph 3-2.

Pipe wrench, straight, 12-inch.

a. Repair (paras 38 to 315).

Tube cutter.

b. Troubleshooting (para 33).

Snapring plier set.

3-2.

Tools, Materials, and Test Equipment

Spanner wrench, 1 inch.

Required

Toolkit, Photographic Repairman TK-77/GF.

Toolkit, Photographic Repairman TK-109/GF.

The following tools, materials, and test equipment are

Wire brush.

required for direct and general support maintenance:

Tru Arc pliers.

Section II. TROUBLESHOOTING

isolated by sight, touch, or hearing. The majority of

3-3.

General Instructions

faults, however, must be isolated by electrical and

operational checks, and inspection of components.

Direct and general support troubleshooting includes all

the techniques outlined for operator's and organizational

3-4.

Troubleshooting Procedures

maintenance and any special or additional techniques

required to isolate a defective part. These procedures

are not complete in themselves but supplement the

To troubleshoot the darkroom, first perform the

procedures described for maintenance. The systematic

troubleshooting procedures given in the technical

troubleshooting

procedures,

which

begin

with

manuals listed in appendix A, and then use the

troubleshooting performed at an operational and

troubleshooting charts given below. Refer also to the

organizational level, must be completed by further

wiring diragrams (figs. 3-1, 5-1, and 5-2).

localizing and isolating techniques. Localization means

Before making any repair or replacements, make certain

tracing the fault to the component responsible for

that the component suspected of a malfunction is

abnormal operation. Isolation means tracing the fault to

defective, by performing the testing procedures outlined

a defective part.

Some faults can often be

in chapters 4 and 5.

3-1