MASBUS

The multiadapter bridge detected a problem with a connection to a PCI adapter that it controls either in a physical card location or embedded in a FRU.

The problem is either in the bus between the multiadapter bridge and the adapter, or with the card slot. The card location might or might not have an installed card.

1. Are you working from the serviceable event view and a card location is listed with this FRU?
   • No: Record the bus number value, BBBB, in word 7 of the reference code. Word 7 of the reference code allows you to determine the correct bus number, bus type, multiadapter bridge number, multiadapter bridge function number, and logical card number from the Direct Select Address (DSA). See DSA translation. Continue with the next step.
   • Yes: Then the listed card location is where the error is located. Continue with the next step.
2. The failing component is the FRU that contains the physical or embedded card slot that is controlled by the multiadapter bridge. Identify the system model, I/O unit, or machine type that is indicated by the location in the serviceable event view, or by using the bus number.

   Use the following table to determine the part number for the field replaceable unit (FRU).

   Table 1. Failing component service information for MASBUS

   CCIN or FFC	Type and model	Part number	Description	Location code
   2BFB, 2BFC	8202-E4B, 8205-E6B, 8231-E2B	See System parts.	System backplane	Un-P1
   2B4B	8202-E4C, 8231-E1C	See System parts.	System backplane	Un-P1
   2B2D	8202-E4D, 8231-E1D, 8268-E1D	See System parts.	System backplane	Un-P1
   2B4A	8205-E6C, 8231-E2C	See System parts.	System backplane	Un-P1
   2B2C	8205-E6D, 8231-E2D	See System parts.	System backplane	Un-P1
   28A5	8233-E8B, 8236-E8C	See System parts.	System backplane	Un-P1
   2B65	8248-L4T, 8408-E8D, 9109-RMD	See System parts.	I/O backplane	Un-P2
   2BB9	9117-MMB, 9179-MHB	See System parts.	I/O backplane	Un-P2
   2B59	8412-EAD, 9117-MMC, 9117-MMD, 9179-MHC, or 9179-MHD	See System parts.	I/O backplane	Un-P2
   2E00	9125-F2C	See System parts.	System backplane	Un-P1
   50A2	5802, 5877	See System parts.	I/O backplane	Un-P1
   50A2	5803, 5873	See System parts.	I/O backplane	Un-P1, Un-P2
   520C	5796, 7314-G30	See System parts.	I/O backplane	Un-P1

   If you need additional information for failing part numbers, location codes, or removal and replacement procedures, see Part locations and location codes. Select your machine type and model number to find additional location codes, part numbers, or replacement procedures for your system.

This ends the procedure.