Models 840/Sb3 Processor Tower - Power Supply (Ps) (P01 Through P06) - IBM iSeries 270 Service Manual

To remove or replace the power subframe assembly (PB1):
1. Print out a rack configuration sheet so that you know where all devices and cards are located in the
system rack.
2. Power the off system. See Power on/off the system and logical partitions.
3. Disconnect the ac power cord.
4. Remove the front and rear system covers. See Models 840/SB3 - Covers.
5. Refer to Final assembly, front - Models 840 and SB3 processor tower and perform the following steps:
a. Remove the bulk power EMC access plate covering the AMDs and bulk power supplies.
b. Remove the screws from the bulk power supplies and AMD assemblies.
c. Slide out the bulk power supplies and AMD assemblies far enough so that they are disconnected
from their power connectors.
6. Refer to Final assembly, rear - Models 840 and SB3 processor tower and then perform the following
steps from the rear of the system:
a. Remove the battery backup EMC access plate.
b. Remove the battery.
CAUTION:
The weight of this part or unit is between 18 and 32 kilograms (39.7 and 70.5 pounds). It
takes two persons to safely lift this part or unit. (RSFTC204)
c. Remove the battery charger.
d. Remove the AC box.
e. Remove the rear AMD EMC access plate.
f. Remove the rear AMDs.
g. Remove the CEC regulator EMC access plate that covers the power regulators.
h. Mark the regulators and their locations so that you can reinstall them in the proper locations.
i. Remove the power regulators and SPCN card.
j. Carefully remove the top row of screws that are inside the CEC cage. Do not allow the screws to be
dropped down inside the system.
k. Remove the bottom row of screws that are inside the CEC cage.
l. Remove the screws from the top cage retaining bracket and remove the bracket.
m. Remove the screws from the left cage retaining bracket and remove the bracket.
n. Remove the screws from the right side and bottom of the CEC cage that mount the cage into the
rack. Slide the CEC cage out of the frame.
o. Disconnect the power cables that are connected to the lower right and lower left corners of the
backplane.
p. Remove the screws from the top and bottom of the power subframe assembly.
q. Remove the power subframe assembly.
7. Install the new power subframe assembly by reversing the removal procedure. After exchanging an
item, go to Verify the repair.
This ends the procedure.

Models 840/SB3 processor tower - Power supply (PS) (P01 through P06)

For use by authorized service providers.
Use this procedure to remove or replace the power supply (P01 through P06) in the Models 840/SB3
processor tower.
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Hardware (Remove and Replace; Part Locations and Listings)