NEC POWERMATE VE ETC Manual page 43

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Take care not to drop the slot cover and support into
the system.
Removing the slot cover support screws
4. Hold the board by its edges, component side down and
the bracket end facing the rear of the unit, and insert it
into the expansion slot.
Press the board firmly into the expansion slot connector.
Gently rock the board from side-to-side to seat it into the
connector.
CAUTION
Slot Cover
Slot Cover Support
Screws
Installing Options 3-13