Models 870 And 890 - Unit Emergency Power Off (Uepo) Card Assembly - IBM iSeries 270 Service Manual

18. Remove the UEPO switch. See Models 870 and 890 - Unit emergency power off (UEPO) card
assembly.
19. Remove the screws attaching the chassis to the vertical EIA rails at the front and rear, using an 8mm
extension socket.
Note: Rear screws also remove mounting brackets.
20. At the back of the system, remove the rear hold down brackets.
21. Position the lift tool at the front of the rack. Alight the lift tool such that the system unit backplane will
not be blocked (at the lip of the orange lift plate) from removal. Install wheel chocks on the lift tool
casters. Engage the lift tool brake.
22. Raise plate to height such that the lift plate is just below the base of the system unit backplane.
Release pins on the lift plate and fully extend the center portion of the plate toward the system unit
backplane and lock it in place. Release pins on the extender arms and position them on both left and
right side, arms must fit around the frame extenders and lock in place (do not adjust the lift tool once
these arms are locked in place).
23. One person should gently push the system unit backplane toward the tool from the rear of the system
(do not bend vertical system unit backplane support bars). Two people should gently pull and guide
the system unit backplane onto the lift plate. The system unit backplane must be removed far enough
to clear the front face of the frame. Retract extender arms and center portion of lift plate.
24. Use tie down strap to hold the system unit backplane to the lift plate.
25. Lower system unit backplane to the bottom position of the lift tool.
26. Remove the wheel chocks and release the break. Flip the crank handle 180 degrees. Carefully move
the lift tool with the system unit backplane to the staging area. The brake and wheel chocks must be
in place when transferring the system unit backplane chassis to or from the packaging material.
To replace the system unit backplane - MB1:
Attention: Look for small amounts of debris on the connecting surfaces between the backplane and the
processor module. Mating the two surfaces is critical for the processor to function properly.
1. Position the lift tool such that the new system unit backplane chassis can be moved onto the lift plate.
2. Install the wheel chocks and engage the brake.
3. Move the new system unit backplane onto the tool with the rear side flush with the lift plate. Strap the
system unit backplane to the lift plate using the down strap.
4. Position the lift tool as close as possible to the front of the rack.
5. Raise the lift tool until it is even with the rails.
6. Remove the tie down strap. One person should gently pull the system unit backplane into the frame
from the rear of the system (do not bend vertical system unit backplane support bars). Two people
should gently push and guide the system unit backplane into the frame. Adjust the height of the lift
plate, as needed.
7. After the system unit backplane is installed in the frame, lower the lift plate and remove it from the lift
tool, repackage the lift tool.
8. Reinstall all components removed during the removal process by reversing steps 21 through the
beginning of the removal procedure.
This ends the procedure.

Models 870 and 890 - Unit Emergency Power Off (UEPO) card assembly

For use by authorized service providers.
Use this procedure to remove or replace the Unit Emergency Power Off (UEPO) card assembly on the
Models 870 and 890.
To remove the Unit Emergency Power Off (UEPO) card assembly:
1. Locate the faulty UEPO switch on the system.
Analyze hardware problems
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