IBM RS/6000 H50, Installation And Service Manual

Page: 213 / 327

Power Supplies and Power Supply Fan Assemblies
Notes:
1. The CPU Drawer can hold up to two power supplies. You can replace each
supply separately. The removal and replacement procedures are the same for
each power supply.
2. If the CPU Drawer has two power supplies and only only one needs to be
removed, you do not have to power down the system.
3. Each power supply has a test switch. See “Power Supply Test Switch
Procedure” on page 7-18.
4. If your system has only one power supply, the unused power supply position
must be filled with a power supply blank, which must have a power supply fan
assembly attached to it.
5. Do not perform the hot-swap procedure for a power supply if the ambient tem-
perature is greater than 32°C (90°F), as it can cause loss of data or data cor-
ruption.
6. Be sure that the replacement power supply is ready to install, as the CPU
Drawer can encounter problems if the power supply is removed for longer than
five minutes.
7. You need a 6mm nutdriver to perform this procedure.
Removal
DANGER
Do not attempt to open the covers of the power supply. Power sup-
plies are not serviceable and are to be replaced as a unit.
1. If you have not already done so, open the rear door of the rack unit and locate
the drawer you need to work on.
2. Unplug the power cord from the power supply.
3. Reposition any other cables necessary to allow the removal of the power supply.
4. Remove the screw from the center of the power supply handle and save it for
replacement.
5. Grasp the handle of the power supply and pivot it upward.
Chapter 7. Removal and Replacement Procedures
7-19