CHAPTER 7 DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS

TM 5-6350-262-14/5

NAVELEX 0967-466-9050

TO 31S9-4-38-1 Chg 3

CHAPTER 7

DIRECT SUPPORT (INTERMEDIATE)

MAINTENANCE INSTRUCTIONS

Section I. GENERAL

WARNING

The Control Unit contains a rechargeable battery which may generate ignitible amounts of

hydrogen gas if certain failures occur. This is a potential safety hazard. Do not smoke when

opening the Control Unit door. Allow the unit to ventilate with the door open for two minutes

before turning the POWER switch to OFF or performing any other maintenance action. If

excessive heat or fumes of any nature are being emitted from the Control Unit, immediately open

the enclosure door and ventilate for two minutes before turning the power off. Do not smoke in

the vicinity of the unit during initial opening or during the two-minute ventilation period.

7-1. Scope

7-2. Purpose

This chapter provides specific instructions for all maintenance

functions authorized direct support maintenance personnel by

The purpose of this chapter is to provide instructions

the maintenance allocation chart (appendix B). Included is a

necessary for keeping the control unit operating properly. No

list of test equipment required for maintenance,

periodic preventive maintenance is required by direct support

troubleshooting and repair instructions, entrance and exit time

maintenance personnel, however, the performance standards

adjustment procedures, and equipment performance

should be performed as specified in section V to check the

standards.

ability of the control unit to perform its intended mission.

Section II. TOOLS AND EQUIPMENT

7-3. Standard Tools and Equipment

7-4. Special Tools and Equipment

Table 2-1 lists standard tools and test equipment required for

No special tools or equipment is required for maintenance of

control unit maintenance.

the

control

unit.

Section III. TROUBLESHOOTING

instructions in the corrective action column of chart 7-1 have

7-5. General

been completed, turn off test equipment and set the control

Troubleshooting chart 7-1 is keyed to the step and procedure

unit POWER switch to OFF. Faulty electrical connections

number of the control unit performance standards, table 7-1.

between the control unit and status processor (plug P1 and

Troubleshooting the control unit consists of conducting the

receptable J12) will probably be caused by connector defects

performance standard test as prescribed in paragraph 7-24

rather than wiring defects. Replace assemblies that have

and, in case of an unacceptable test result, replacing the

been removed as part of the correction action instruction.

component or module specified in the corrective action

Disconnect plug P1 and examine both halves of the connector

column of the troubleshooting chart. Instructions for replacing

assembly for bent, broken, loose, dirty, or missing pins and

defective components are provided in section IV.

receptacles. Examine also for moisture. If no damage is

7-6. Troubleshooting the Control Unit

observed, check continuity of switches S3 and S5 as

Troubleshooting chart 7-1 lists all the symptoms and probable

applicable. Make a thorough visual inspection of wiring

causes that may appear while performing the performance

insulation and components.

standards test. It a failure indication is repeated after all

Section IV. MAINTENANCE OF CONTROL UNIT

7-7. Scope

or checkout on the Control Unit take care

to ensure that the test points on the

This section contains instructions for corrective

Status Processor circuit cards are never

maintenance of the control unit. The extent of maintenance to

be performed by direct support personnel is governed by the

inadvertently grounded.

When taking

maintenance allocation chart (appendix B) and allocation of

voltage measurements with a voltometer

parts (appendix C).

ensure that the meter is set to the proper

voltage range before plugging a probe

CAUTION

into a test point.

When installing or performing maintenance

Change 3

7-1