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Corrective Maintenance
CSA 803A Service Manual
6Ć51
A15 Memory Management Unit (MMU) Board
See Figures 6Ć4, 6Ć7, 6Ć20, and 6Ć32 for board, connector, screw, and index
locations.
Remove and replace the A15 MMU 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 attach to the edge of a metal bracket. Both ends of the
guides can be pried loose.
ăStep 3:ăRemove connectors J52, J53, J57, and J83 from the A15 MMU
board. Note the position of multiĆpin connector index triangles to ensure
that you can correctly replace these connectors.
ăStep 4:ăLift the white, hinged tabs at the front and rear edges of the A15
MMU board. Pull the tabs upward until the A15 MMU board separates
from the A13 Mother board.
ăStep 5:ăRemove the A15 MMU board.
To replace the A15 MMU board, perform the previous steps in the reverse
order.
NOTE
Insert the board edges into the plastic guides at each end of the
card cage. Lower the board into position.
Ensure that connector P101 is seated on the A13 Mother board
connector. Push down firmly on the A15 MMU board to seat this
connector on the A13 Mother board.