Replacing A Rectifier - Nortel SONET AccessNode User Manual

8-14 Testing the batteries and rectifiers
Procedure 8-3

Replacing a rectifier

Use this procedure to replace an NT5C06 MPR25 rectifier in the modular
business package (MBP) master cabinet.
The MPR25 rectifier can be replaced in service without power interruption to
the load (hot insert).
Requirements
•
Action
Step
1
2
3
4
AccessNode P0904244 Issue 1.0
screwdriver, flat blade, 1/4-in. blade width
Action
Remove the equipment cover below the pedestal on the master cabinet, as
outlined in Chapter 3, "Removing covers and grilles."
On the rectifier to be replaced, set first the ac and then the dc circuit breakers
to the OFF position.
Set the dc distribution shelf sense DIP switch for this rectifier to the OFF
position. The sense DIP switch is located on the control circuit pack.
At the front of the rectifier shelf, release the two captive screws that hold the
clamping bar in place as shown following. Swing the clamping bar downward.
Note: For clarity, the following figure shows a shelf with no rectifiers installed.
Left
blanking
plate
Captive
screw
Swing clamping bar
downward to open
—continued—
Captive
screw