HP StorageWorks 2300 Disk System - Manual (Page 123)

Removal and Replacement 123
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Power Supply
Replace a power supply as soon as possible when troubleshooting indicates a
power supply failure (see “Isolating Causes” in Chapter 4). If a power supply
fails, the remaining power supply provides proper voltage to the disk system.
However, if the remaining power supply fails before the first power supply is
replaced, the disk system will turn off.
The power supply fan may continue to operate even when a power supply fails.
You do not need to turn off the disk system to replace a power supply.
Follow ESD procedures whenever possible.
Tools
ESD wrist strap (no hand tools are required to perform this procedure).
Whenever possible, follow ESD procedures.
Procedure
Caution Do not remove a power supply from an operating product
until you have the replacement and are ready to install it.
An empty slot will cause uneven cooling and eventual
overheating.
The power supply may be hot to touch.
1 Disconnect the power cord from the power supply.
2 Loosen the thumbscrews on the power supply handles (A and B in Figure 57).
3 Rotate the handles out to disengage the power supply from the midplane.
4 Pull the power supply out of the chassis. Support the far end of the supply
with your free hand as it clears the chassis.
Replace the power supply immediately if the product is in use (see next step).