Nortel Networks BCM200/400 - Manual (Page 291)

Chapter 23 Replacing or upgrading a power supply 291
BCM200/400 4.0 Installation and Maintenance Guide
3 Disconnect the main unit and the expansion unit (if applicable) from the AC power
connection.
4 Remove the top cover from the main unit (see “Removing the main unit top cover” on page
252 ).
5 Attach one end of the grounding strap to your wrist and the other end to a grounded metal
surface.
6 Disconnect all cables from the I/O card.
7 Locate and disconnect the power supply cables from the media bay backplane and hard disk.
8 Partially remove the base function tray (see “Removing the base function tray” on page 242 ).
9 Unfasten the power supply cable clamp located on the underside of the main unit top cover
(see
Figure 143 ). Gather the power supply cables away from the interior and toward the rear of
the main unit.
10 Remove the four power supply chassis screws from the back of the main unit (see Figure 143 ).
Place the screws in a safe location.
Figure 143 Remove the BCM400 power supply screws
11 Unfasten the exterior and interior power supply support bracket mounting screws (see Figure
144 ). Place the screws in a safe location.
12 Remove the power supply and support bracket out and away from the BCM400 main unit.
Unfasten cable
clamp - located
on underside of
cover
Unfasten exterior
power supply support
bracket mounting
screws
Unfasten power
supply mounting
screws