Circuit Card Removal and Replacement - TM-11-6625-2937-130053

(2) Secure top access cover (2) to control-

5-3, sheet 2) as follows:

interface unit by tightening 16, quarter-turn fasteners (1).

WARNING

(3) Carefully invert the control-interface unit.

Ensure all power is disconnected from equipment.

(4) Secure bottom access cover (17) to control-

(1) Remove top and bottom access covers from

interface unit by tightening 16, quarter-turn fasteners (1).

control-interface unit (para 5-14a).

Place control-

5) Carefully invert the control-interface unit and

interface unit on its right side.

place it in the normal operating position.

(2) Locate filter assembly AI FLI (5) on rear

5-15. Circuit Card Removal and Replacement (fig.

panel of control-interface unit and tag wires connected to

5-3)

its four terminals (five wires).

(3) Unsolder wires tagged in step (2) from filter

NOTE

assembly AIFLI terminals C1, C2, C3 and C4 (fig. 5-4).

Circuit card positions are numbered from

Place wires carefully aside.

front panel to rear panel of control-

CAUTION

interface unit as Al through A12,

respectively.

Hold filter assembly Al FLI securely to

a. Removal Remove circuit cards as follows:

prevent damage to adjacent hardware while

performing steps (4) and (5).

(1) Remove top access cover (para 5-14a).

(2) Loosen four quarter-turn fasteners (3, fig. 5-

(4) Remove four Allen screws (18, fig. 5-3,

3)on inner cover (4). Remove inner cover (4) to gain

sheet 2) and associated washers securing filter

access to circuit cards.

assembly AIFLI to rear panel.

(3) Lift up on card extractors of each circuit card

(5) Remove filter assembly A1FL1I, being

to be removed to release circuit card from locked

careful to clear rear panel.

position.

(4) Grasp circuit card firmly and remove by

NOTE

pulling straight up.

It may be necessary to move cable harness

b. Replacement. Replace circuit card as follows:

aside to provide additional clearance for

(1) Line up circuit card in correct circuit card

removal of filter assembly A1FL1

position with component side of circuit card facing toward

b. Replacement. Replace filter assembly AIFLI

front of control-interface unit.

as follows:

(2) with card extractors raised in unlocked

(1) Position replacement filter assembly AIFLI

position lifted up) apply steady straight down pressure to

on rear panel of control-interface unit. Secure in place

seat circuit card in circuit card connector.

with four Allen screws (18) and associated washers.

(3) Press down on card extractors until circuit

(2) Reconnect wires to AIFLI terminals C1, C2,.

card is locked in position and properly seated in circuit

C3 and C4 (fig. 5-4). Remove tags from wires.

card connector.

(3) Replace top and bottom access covers (para

(4) Replace inner cover (4) over circuit cards.

5-14b).

Secure cover by tightening four quarter-turn fasteners

5-17. Filter Assembly Al FL1 Repair Repair of filter

(1).

assembly A1FL1(5, fig. 5-3, sheet 2) is performed by

(5) Replace top access cover (para 5-14b).

performing continuity checks and replacing defective

5-16. Filter Assembly A1FL1 Removal and

parts. Refer to figure 5-4 for parts location.

Replacement (fig. 5-3)

a. Removal. Remove filter assembly AIFLI (5,

fig.

5-12