Models 870 And 890 - Bulk Power Controller (Bpc) - IBM iSeries 270 Service Manual

Models 870 and 890 - MDA (air mover) controller
Models 870 and 890 - Memory books and memory blanks
Models 870 and 890 - Motor scroll assembly (MSA) air filters
Models 870 and 890 - MSA (air mover) enclosure
Models 870 and 890 - Network interface controller (NIC) card
Models 870 and 890 (FC 9094) - Power distribution backplane - PB1
Models 870 and 890 (FC 9094) - Power supply - P00, P01, P02, and P03
Models 870 and 890 - Processor MSA (air mover) assembly
Models 870 and 890 (FC 9094) - Removable media - D41 and D42
Models 870 and 890 - Supporting information
Models 870 and 890 - System clock card
Models 870 and 890 - System unit backplane
Models 870 and 890 (FC 9094) - Time of day battery
Models 870 and 890 (FC 9094) - Tower card - CB1
Models 870 and 890 - Unit Emergency Power Off (UEPO) card assembly
Models 870 and 890 - VPD card

Models 870 and 890 - Bulk power controller (BPC)

For use by authorized service providers.
Use this procedure to remove or replace the bulk power controller (BPC) on the Models 870 and 890. The
BPC is located immediately above the top bulk power regulator (BPR). See Locations — Models 870 and
890.
To remove the bulk power controller (BPC):
1. Do not power down the system if it is powered on; this procedure can be performed concurrently.
2. Locate the BPC to be replaced by decoding the SRC (see System reference codes), or see Locations
— Models 870 and 890.
3. Open the cover to access the field replaceable unit (FRU). See Models 870 and 890 - Covers.
4. Note the state of the located BPC's LEDs. Then, press the (green) Start Service button on the UEPO
panel, and only proceed if the good LED is off, or the repair has been scheduled (system outage -
EPO off).
5. Manually turn off (to the right) the on-lock/off-unlock switch on all of the BPRs attached to the side of
the bulk power assembly (BPA) being repaired (ENBL LED'S off).
6. Verify that all cables are labeled for plug location, and then unplug them from the BPC.
7. Loosen the left and right thumb screws using the torque tool (PN 6422789), and slide the unit out of
the slot.
Note: The BPC weighs approximately seven pounds.
Analyze hardware problems
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