Grass Valley Network Attached Storage System Serial ATA Network User Guide v.1.0.04 - Manual (Page 168)

Replacing a RAID Controller
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Make sure the canister is fully inserted and has made full connection with the
midplane. Insert the new replacement controller. Make sure the controller is
properly seated. It will require you to grasp the power supply handles with your
fingers and, with your thumbs, push the controller into place (tighten captive
screws)
It takes a great deal of force to truly seat the board. Make sure
complete contact is made.
2. Push the canister the rest of the way into the bay. Latch the ejector levers on
the back of the canister, as shown in Step 2, above.
3. Tighten the captive screw, as shown in Step 3, above.
4. Replace fibre channel cable to the controller.