Chapter 5. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

TM 11-6825-2937-13

CHAPTER 5

DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

Section I. GENERAL

5-1. Introduction Maintenance instructions presented in

equipment. Serious injury or DEATH may

this chapter apply primarily to Test Set, Electronic

result from contact with terminals carrying this

Systems TS-3796/UKM-4

(control-interface unit).

voltage.

Maintenance instructions for Test Set, Electronic

CAUTION

Systems AN/UYM-7 (digital tester) are given in TM 11-

When making resistance measurements

6625-2951-13. The following maintenance duties are

ensure that power is removed from the unit

assigned to direct support maintenance personnel:

being tested. Failure to comply may result in

erroneous readings or in damage to the

Testing the control-interface unit to localize

equipment.

trouble to a faulty subassembly or chassis-

mounted part.

All procedures for making volta3e and

resistance

Replacing faulty subassemblies or chassis-

measurements are contained in the troubleshooting

mounted parts.

procedures.

Performing power supply adjustments.

Repairing filter assembly AIFLI.

5-3.

Waveform Measurements

5-2.

Voltage and Resistance Measurements

ALL procedures for making waveform measurements

WARNING

are contained in the troubleshooting procedures.

Be careful when 115 V ac is applied to the

Section II. TOOLS AND EQUIPMENT

5-4.

Tools and Test Equipment Required

The tools and test equipment required for direct support maintenance are listed below.

Test equipment

Technical manual

Common name

Test Set, Electronic Systems AN/UYM-7

TM 116625-2951-13

Digital tester

Multimeter AN/USM-223

TM 11-6625-654-14

Multimeter

Oscilloscope AN/USM-281C

TM 11-6625-2658-14

Oscilloscope

Tool Kit, Electronics Equipment TK-105/G

SC 518 91C-RO7

Tool Kit

natural oils, prolonged contact with skin should

5-5. Materials Required

be avoided. When necessary, use gloves which

the solvent cannot penetrate. If the solvent is

The materials required for direct support maintenance

taken internally,

consult a physician

are listed below.

immediately.

WARNING

Cleaning compound (tichlorotrifluoroethane).

Adequate ventilation should be provided while using

Cleaning cloth.

TRICHLOROTRIFLUOROETHANE. Prolonged

Detergent.

breathing of vapor should be avoided. The

Fine bristle brush.

solvent should not be used near heat or open

Fine sandpaper.

flame; the products of decomposition are toxic

Silicone heatsink compound (Dow Corning 340).

and

irritating.

Since

TRICHLOROTRIFLUOROETHANE

dissolves

Section III. TROUBLESHOOTING

comprises a list of tools and test equipment required, a

5-6.

General

test setup diagram, a functional test procedure, a

WARNING

troubleshooting table, and additional data as required .

Be careful when 115V ac is applied to the

Malfunctions listed in the troubleshooting table are

equipment. Serious injury or DEATH may result

assumed to occur during testing of the control-interface

from contract with terminals carrying this voltage.

unit or its subassembles a s described in Section V The

entire test procedure should be repeated after repair to

This section contains information to aid in the direct

ensure that the malfunction was corrected.

support troubleshooting of the control-interface unit and

each repairable subassembly.

The troubleshooting

procedure

5-1