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Corrective Maintenance
CSA 803A Service Manual
6Ć55
A18 Memory Board
See Figures 6Ć4, 6Ć7, 6Ć21, 6Ć22, and 6Ć32 for board, connector, screw, and
index locations.
Remove and replace the A18 Memory board as follows:
ăStep 1:ăRemove the three Torx head screws that secure the CRT cover,
and then remove the CRT cover.
ăStep 2:ăRemove both of the plastic board guides from the top of the
card cage. The guides are retained by two small catches located in two
holes in the left bracket of the card cage. The other ends of the guides
contain slots that attach to the edge of a metal bracket. Both ends of the
guides can be pried loose.
ăStep 3:ăRemove connector J77 from the A17 Executive Processor
board. Note the position of the multiĆpin connector's index triangle to
ensure that you can correctly replace this connector.
ăStep 4:ăLift the white, hinged tabs at the front and rear edges of the
board. Pull the tabs upward until the A18 Memory board separates from
the A13 Mother board.
ăStep 5:ăRemove the A18 Memory board.
To replace the A18 Memory board, perform the previous steps in reverse
order.
NOTE
Insert the edges of the board into the plastic guides at each end of
the card cage. Lower the board into position.
Ensure that connector P106 is seated on the A13 Mother board
connector. Push down firmly on the A18 Memory board to seat this
connector on the A13 Mother board.
WARNING
A lithium battery (BT130) is mounted on the A18 Memory board. Be
careful when placing the A18 Memory board on metal surfaces. If
some IC or battery leads are shorted, the battery may discharge or
overheat and vent. (You can use plastic standoffs to prevent short
circuits.) This battery requires special handling for disposal.
Refer to the instructions on Lithium Battery Disposal and First Aid
earlier in this section.