Allied Telesis AT-8400 Series Reference Manual page 70

Installing and Replacing the AT-8401 Management Card
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7. Simultaneously push the locking levers on the management card
into the locked position.
When the levers are engaged, they are parallel to the front of the
card which is flush with the chassis. See Figure 28
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Figure 28 AT-8401 Management Card Installed
8. Secure the card to the chassis by using a Phillips screwdriver to
tighten the two installation screws on the card faceplate.
Note
Always use installation screws to secure the card to the chassis.
Leaving a card partially seated may cause the system to halt and
subsequently crash.
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