Mitel 3300 Technician's Handbook page 199

To add or replace the APC-CX(i):
CAUTION: Use ESD straps when handling the APC.
1. Remove the controller, hard drives, and APC-CX(i) from their
packaging.
2. Remove the top cover of the controller (Refer to the Release 8.0
Technician's Handbook for instructions).
3. Place the APC module on the main board connectors. The connectors
are spaced irregularly to assist in alignment. Orient the module as
show in Figure 55.
Figure 55: Seat APC Module Connectors onto Main Board
Connectors
Install and Replace Units
189