4. Remove the disk units from the system. Identify each disk unit with a disk unit board location and slot
location.
5. Remove the four short screws on the perimeter of the disk unit board/cage aAssembly and the two
longer screws located inside the assembly.
6. Partially remove the disk unit board/cage assembly.
7. Caution while performing this step: The disk unit board/cage assembly power connector plugs
directly into the power connector bracket assembly. Viewing the connector from the right side of the
system; pull on the board/cage assembly just until the connector disengages. Do NOT attempt to
remove the board/cage assembly from the system because the SCSI cable is attached on the left
side of the board/cage assembly and it will be damaged.
8. Remove the removable media units from the system. Identify each removable media unit with slot
location.
9. Remove the two short screws on the perimeter of the removable media unit board/cage assembly,
and the two longer screws located inside the assembly.
10. Remove the removable media board/cage assembly from the system. The removable media
board/cage assembly power and SCSI cables must be removed from the back side of the assembly.
Viewing the assembly from the right side of the system; pull on the on the board/cage assembly just
until you can unplug these cables; then remove the assembly from the system.
11. Remove the top air moving device (AMD) assembly.
12. Remove the AMD power cable plug from the power cable harness assembly connector.
13. Remove the power cable harness assembly AMD connector from the inner frame wall, by squeezing
the tabs located on the connector.
14. Remove the four screws from the power cable retaining bracket, located on the right side of the
system.
15. Remove the three screws from each of the power supply connectors. Slide the power supply
connectors down to remove it from the system frame.
16. Remove the five power cable connectors from the backplane assembly; write down their locations.
17. Remove the Interlock switch assembly plug from the power cable harness assembly connector.
18. Remove the power cable harness assembly from the system.
19. Reverse these steps to install the replacement power cable harness.
20. Power on the system. It should IPL without an Interlock system reference code (SRC).
This
ends the procedure.
Model 825 - Power supply P01 and P02
For use by authorized service providers.
Use this procedure to remove or replace the power supply P01 and P02 on a Model 825.
Note: Two powered on/rotating air moving devices (excluding the air moving devices (AMDs) mounted on
the power supplies), and two power supplies MUST be installed to perform this procedure concurrently.
To remove or replace the power supply P01 or P02:
1. Are there two powered on/rotating AMDs and two power supplies installed in the system unit?
v Yes: Continue with the next step.
v No: Perform the following:
a. Power down the system unit. See Power on/off the system and logical partitions.
b. Remove the power cord from the rear of the system unit, and continue with the next step.
2.
Remove the back side cover, see Model 825 - Covers.
3. Remove the power cord from the power supply to be replaced.
4. Pull out the power supply handle release button.
42 Hardware (Remove and Replace; Part Locations and Listings)
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