Mappwr-7: There Is A Bulk Power Assembly (Bpa) Communication Failure - IBM iSeries Series Hardware Problem Analysis And Isolation

– The processor MCM module 1 at location M16
– The processor MCM module 2 at location M11
After each FRU is exchanged, is the error code that sent you to this procedure still reported?
– No: The problem has been corrected. Go to Verify the repair.
This ends the procedure.
– Yes: Replace the next FRU on the list. If all FRUs on the list have been replaced, call your next
level of support.

MAPPWR-7: There is a bulk power assembly (BPA) communication 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. Press the (green) Start service button. Wait 30 seconds. Press the (white) Service complete button.
Is the error code that sent you to this procedure still reported?
v No: The problem has been corrected. Go to Verify the repair.
This ends the procedure.
v Yes: Continue with the next step.
2. Check the position of the on/off switch on the BPRs. Is the switch in the ON position (to the left)?
v Yes: Continue with the next step.
v No: Set the switch to the ON position (to the left), and press the (white) Service Complete button.
See Verify the repair.
This ends the procedure.
3. Perform the following:
a. Prepare a multimeter to measure up to 600 V ac.
b. Use the multimeter to measure the ac voltage at the following test points on the face plate of the
BPA that is not referenced by the error code that sent you to this procedure:
Figure 1. Measuring the ac voltage
v Phase A and phase B
v Phase B and phase C
v Phase C and phase A
Are all the readings greater than 180 V ac?
v No: Continue with the next step.
v Yes: Exchange the following FRUs one at a time:
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iSeries: iSeries Server 270, 800, 810, 820, 825, 830, 840, 870, 890, SB2, and SB3 Hardware Problem Analysis and
Isolation