Nortel Networks 400 4.0 User Manual

Chapter 23 Replacing or upgrading a power supply

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11 Unfasten the exterior and interior power supply support bracket mounting screws (see 

). Place the screws in a safe location.

12 Remove the power supply and support bracket out and away from the BCM400 main unit. 

Figure 143   Remove the power supply and support bracket

13 Remove the tie-wrap from the power supply support bracket. Place the power supply in a safe, 

static-free location.

Use this procedure to install a functional standard power supply in a BCM400 main unit. The base 
function and advanced function trays must be partially removed. 

Ensure the new power supply is an auto-adjust power supply.

Insert a tie-wrap in the power supply support bracket lanclet. 

Place the standard power supply (top down) on a flat surface. Place the power supply support 
bracket on the bottom surface of the power supply.

Gather together and route the main card 20-pin power cable (P1) and the +12v power cable 
(P9) at the tie-wrap.

Warning: Protect the hardware components against damage from electrostatic discharge. 
Always wear a grounded wrist strap before you handle components. Always place the 
components in a static-free container.

Warning: Power supply cable management is critical. Loose or incorrectly positioned 
cables can result in cable damage.

Cut the cable 
tie-wrap away from 
the power supply 
support bracket. 
Remove power 
supply

Remove the power 
supply and support 
bracket from main unit

Remove exterior and interior power supply support 
bracket mounting screws (power supply not shown) - 
Remove power supply support bracket