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Chapter 29
Replacing Parts
Replacing an AC Power Supply
BPX switches are powered by redundant power supplies; either power supply can supply the current
requirements of the node. The AC Power Supply is part of an assembly which is replaced as a single unit.
Access to the AC Power Supply assembly is from the front, but first, the Air Intake Grille must be
removed.
To remove a power supply, use the following procedure:
If you haven't already done so, check the status and output voltage of the power supplies at the node
Step 1
using the dspasm command. Note which power supply is failed, A or B. Power supply A is on the right
side facing the rear of the node.
Remove the Air Intake Grille. Locate the small access hole in the top, center of the Air Intake Grille.
Step 2
Fully insert a flat-bladed screwdriver (with a 1/4 in. blade) in the access hole.
Step 3
Rotate the screwdriver to release the spring latch holding the Air Intake Grille (see Figure 29-4). The
Step 4
grille should pop out.
Figure 29-4 AC Power Supply Assembly
Plunger
Step 5
Tilt the grille forward approximately a 45° angle, then lift if out and set it aside. This exposes the power
supply retainer bracket.
Step 6
With a flat-bladed screwdriver, loosen the retainer bracket hold-down screw in the center of the bracket
and tilt the bracket.
Identify which power supply needs replacement. Power supply A is the unit on the left, B is on the right.
Step 7
In most cases, the failed unit is identified by a front panel lamp indication.
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Power supply
plunger hole
Power
supply
Power supply
thumb screw
Power supply
thumb screw
Retainer
captive
screw
Cisco BPX 8600 Series Installation and Configuration
Replacing an AC Power Supply
Slot B empty if
non-redundant
Power supply
retainer
29-7
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