TROUBLESHOOTING - TM-11-5805-688-14-10283

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

2. If the card number appearing in the FAULT

5. Momentarily press front panel DISPLAY RESET

LOCATION display is 15 or less, replace card as

switch.

prescribed in paragraph 6-22. If the displayed card

number is 16 or greater, set POWER CONTROL switch

6. Upon release of DISPLAY RESET switch,

to OFF, and then replace card as pre- scribed in

observe that all error indicators remain out and POWER

paragraph 6-22.

CONTROL ON indicator is lighted.

3. If POWER CONTROL switch was previously set

to OFF, set switch to ON.

7. Perform a lamp test as pre- scribed in paragraph

6-33.

4. Set SELF TEST switch of off (down) position.

6-13.

TROUBLESHOOTING.

5. Momentarily press DISPLAY RE-SET switch.

6-14. GENERAL. Although the multiplexer set has

6. Upon release of DISPLAY RESET switch,

many built-in diagnostic features, certain limited types of

observe that all front panel error indicators remain out

mal- functions must be isolated by the use of

and POWER CONTROL ON indicator is lighted.

conventional troubleshooting techniques. The following

paragraphs provide useful information for performance of

7. Perform a self-test as pre- scribed in paragraph

such troubleshooting.

6-32.

6-15. Table 6-2 lists a number of abnormal multiplexer

6-12. LAMP TEST MODE. A lamp test feature is

set operating symptoms, together with their probable

provided for detection and isolation of defective front

causes. Appropriate corrective actions are also listed.

panel indicator lamps and displays. Perform detection

Table 6-3 lists, by name, the signals appearing within the

and isolation procedures as follows:

multiplexer set. The function of each signal is also listed.

Special purpose switch data useful in troubleshooting the

1. Press LAMP TEST switch and observe which

equipment are listed in table 6-4.

front panel indicator lamp or FAULT LOCATION display

is not lighted or is indicating an incorrect number.

6-16. Many numbered test points are located at the

outer edges of the cards within the multiplexer set. Most

NOTE

maintenance-significant operating and diagnostic signals

are routed to these test points. The signals appearing at

During lamp test, the correct

these test points are listed in table 6-3. The signals

numerical indication for the FAULT

appearing at other card edge test points may be

identified by referring to the logic diagrams in the circuits

LOCATION display is 88.

diagram manual.

2. Release LAMP TEST switch and set POWER

6-17. EXTENDER CARD USAGE. Monitoring of a

CONTROL switch to OFF.

signal on a card that does not appear at a card edge test

point is accomplished by using the extender card

3. Replace indicator lamp or numerical display-

(extender card assembly P/N 61864080- 009), which is

element observed in step 1 as prescribed in paragraph

stored in slot 22 of the

6-25 or 6-26, respectively.

4. Set POWER CONTROL switch to

6-5