Mappwr-4: There Is A 350 V Bulk Failure - IBM iSeries Series Hardware Problem Analysis And Isolation

v The cable from the UEPO to the BPC on the side referenced by the error code that sent you to this
procedure. See symbolic FRU "CBLPWR" on page 301.
v BPCPWR on the side referenced by the error code that sent you to this procedure. See symbolic
FRU "BPCPWR" on page 287.
After each FRU is exchanged, is the error code that sent you here still reported?
v No: The problem has been corrected. See Verify the repair.
This ends the procedure.
v Yes: Exchange the next FRU in the list. If all of the FRUs have been exchanged, then call your next
level of support.
This ends the procedure.
5. Perform the following actions one at a time:
a. Replace the UEPO card assembly. See Final assembly - Models 870 and 890 for the part number
and a link to the remove and replace procedure. Then, continue with step 6 (See page 369).
b. Check with the customer's site services to test the room EPO for correct operation. When the room
EPO is working correctly, reconnect the cable by performing the following steps:
1) Set the UEPO switch on both bulk power controllers (BPCs) to the BYPASS position.
2) Reconnect the customer's room EPO cable.
3) Set the UEPO switch on both BPCs back to the NORMAL position.
4) Press the (white) Service complete button.
5) Continue with step 6 (See page 369).
6. After each action is performed in step 4, is the error code that brought you here reported?
v No: The problem has been corrected. See Verify the repair.
This ends the procedure.
v Yes: Perform the next action on the list. If all actions have been performed, then call your next level
of support for assistance.
This ends the procedure.

MAPPWR-4: There is a 350 V bulk failure

For use by authorized service providers.
Note: Read the Danger and caution notices in the "MAPPWR" on page 364 introduction before performing
this procedure.
1. This problem can be caused by the bulk power distribution (BPD) plugged into the failing bulk power
assembly (BPA). Check all the BPDs on the side of the BPA (A or B) referenced by the error code that
sent you to this procedure.
FRUs on the operating side of the BPA (with BPC GOOD LED on) must not be disturbed during this
procedure. Perform the following:
a. Turn all the BPR on/off switches on this BPA to the off position (to the right).
b. If there is more than one BPD left to be checked, start with the uppermost BPD. Unplug and make
a note of the BPD to be checked and carefully pull it approximately 25 mm (1 inch) away from the
backplane without unplugging any cables. See the symbolic FRU "BPDPWR" on page 287.
c. Set all the BPR on/off switches on this BPA to the on position (to the left).
Does the BPC GOOD LED on the BPC come on and stay on?
v Yes: Replace the BPD that is currently unplugged. See the symbolic FRU "BPDPWR" on page 287.
Then, see Verify the repair.
This ends the procedure.
v No: Perform the following:
a. Turn all of the BPR on/off switches on this BPA to the off position (to the right).
b. Replug the BPD.
Analyze hardware problems
369