REPAIR AND REPLACEMENT-CONT.

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3011

NOTE

Replacement of the power supply

requires free access to the top of the

The power supply assembly weighs

multiplexer set chassis. If the set is

approximately 25 pounds.

Grasp

installed in an equipment rack, the

handles securely before lifting power

set must be loosened from the rack

supply from chassis.

and extended on its mounting slides

before power supply replacement is

7. Using handles provided, carefully lift power

started.

Depending upon the

supply from chassis.

particular installation, the chassis

may also have to be rotated

8. Install nuts and washers re- moved in step 2.

downward to the 900 (horizontal)

position to enable power supply

9. Carefully install replace- ment power supply in

replacement.

multiplexer set chassis, ensuring that previously

disconnected cables are not wedged under power

1. Loosen and remove power supply access cover

supply.

(figure 6-2) located at top of chassis.

10. Engage and tighten eight power supply securing

2. Loosen and remove nuts and washers securing

fasteners.

the +5V and 5V COM cables to power supply terminal

studs W1-1 and W2-1 (figure 6-3).

11. Connect and lock connector J1.

3. Loosen and remove screws securing the -12,

COM, and +12 leads to TB1 terminals 1 through 3 (figure

6-3).

Ensure that connections to TB1 are

4. Unlock connector mating with J1 (figure 6-3) by

firmly secured to prevent excessive

sliding locking strip until it is free of locking pins; then

voltage drops due to contact

disconnect connector.

resistance.

5. Loosen eight captive fasteners securing power

Torque nuts on W1-1 and W1-2 to

supply to multiplexer set chassis.

proper value to prevent possible

intermittent operation of equipment.

6. Carefully move all disconnected cables away

from power supply to provide a free path for power

12. Connect and tighten the -12, COM, and +12

supply removal.

leads to TB1 terminals 1, 2, and 3, respectively.

13. Torque lower level nuts on W1-1 and W2-1

between 25 to 30 inch- pounds. Install +5V and 5V COM

cables to studs W1-1 and W2-1. Torque upper level

nuts between 25 to 30 inch-pounds.

14. Place lifting handles in storage (horizontal)

position.

15. Install and secure power supply access cover.

16. If the chassis was previously extended and/or

rotated on its mounting

Change 1 6-22