CHAPTER 6 MAINTENANCE - TM-11-5805-688-14-10279

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

CHAPTER 6

MAINTENANCE

SECTION I

ORGANIZATIONAL AND INTERMEDIATE LEVEL MAINTENANCE

Repair of such malfunctions is accomplished by wire or

6-1. INTRODUCTION.

piece part re- placement as applicable.

6-2. This section provides instructions and data

6-6. MAINTENANCE SUPPORT EQUIPMENT.

necessary for the performance of organizational and

intermediate level maintenance of the multiplexer set.

6-7. Table 6-1 lists the tools and test equipment

Included are procedures for the use of built-in test

required for support of organizational and intermediate

features, and repair and replacement procedures for

level maintenance of the multiplexer set.

Brief

major multiplexer components. Data useful for isolation

summaries of pertinent performance characteristics are

of faults not treated by built-in test features are also

also provided. The items listed in table 6-1 are preferred

provided, as are procedures for all required preventive

for multiplexer set maintenance.

maintenance activities.

6-3. The multiplexer set represents a mixture of high-

6-8. FAULT ISOLATION, USING BUILT-IN

performance solid state logic and analog technologies.

DIAGNOSTIC FEATURES.

Personnel attempting detailed intermediate level

maintenance of the multiplexer set should be highly

6-9. GENERAL. Most multiplexer set malfunctions are

familiar with general maintenance and troubleshooting

detected and isolated by the use of built-in diagnostic

methods applicable to solid state integrated circuit

features.

The built-in diagnostics operate in three

equipment and should have a thorough understanding of

modes: automatic, self- test, and lamp test. Self-test and

the multiplexer set theory of operation.

lamp test modes are manually initiated.

6-4. GENERAL.

6-10. AUTOMATIC MODE. In the automatic mode, both

power supply and printed circuit card malfunctions are

6-5. Maintenance of the multiplexer set at the

automatically detected and isolated. A front panel

organizational and intermediate levels encompasses

display (figure 4-1) identifies the malfunctioning items.

both corrective and preventive tasks. Most malfunctions

For power supply faults, the front panel POWER

are detected and isolated to the replaceable item (printed

SUPPLY indicator is lighted. For card faults, either the

circuit card or power supply) by the use of test features

MULTIPLEXER CARD or DEMULTI- PLEXER CARD

that are integral to the equipment design. Repair of such

indicator is lighted and the slot number of the faulty card

malfunctions is accomplished by item replacement, with

appears in the FAULT LOCATION display. Whenever

de- tailed item repair reserved for a depot or other off-

an automatic display of a power supply or card fault

site facility. Malfunctions occurring in the chassis wiring,

occurs, perform steps 1 through 10 (power supply fault)

backplane wiring of the card file, and discrete chassis

or 11 through 15 (card fault) as follows:

and front panel piece parts are diagnosed and isolated

by the use of conventional troubleshooting techniques.

Change 2 6-1