Use this procedure to determine if the multi-adapter bridge is failing when the symbolic FRU PIOCARD isin the failing item list, with other failing items that have a multi-adapter bridge as a component. Theprocedure will start with the failing item list for the SRC that sent you here. It will determine if PIOCARDshould be removed from the failing item list that you are working in.Use the Service Action Log (SAL) to check for other errors under the same multi-adapter bridge using thefollowing steps:1. Were you able to obtain a location for the PIOCARD FRU from the SAL?v No: Find the SRC in the SAL and record the Direct Select Address (DSA) in word 7. See “Breakingdown the SRC” on page 63 to find the DSA in the SRC. Then, continue with the next step.v Yes: Go to step 5 (See page 95).2. Record the Bus number (BBBB part) of the DSA and the Multi-adapter bridge number of the DSA. Themulti-adapter bridge number is the first character of the card identifier part (Cc) in the DSA. See“Breaking down the SRC” on page 63 to find the DSA in the SRC.3. Go to “Bus PIP PCIBUS-PIP1” on page 99 to determine the location of the PCI I/O Card in the failingitem list. Return here and continue with the next step.4. Using the card position table for the frame or I/O tower type that you recorded in “Bus PIPPCIBUS-PIP1” on page 99. Determine which of the card positions within the frame or I/O tower arecontrolled by the same multi-adapter bridge that is controlling the PCI I/O card for which youdetermined the location in step 3 (See page 95). See “Card positions” on page 65 in the Bus-PIPoverview. A card position is controlled by the same multi-adapter bridge if it has the same bus numberand multi-adapter bridge number as the PCI I/O Card that you located in step 3 (See page 95). Recordthe card position and the DSA from the card position table for each card position that is controlled bythe same multi-adapter bridge.5. Look in the service action log (SAL), see “Use the service action log” on page 7. Look for other failuresin the same frame that are located in any of the card positions that you recorded in step 4 (See page95) or that are listed in the SAL with the PIOCARD FRU.6. Are there any other failures within the same frame that correspond with any of the card positions thatyou recorded in step 4 (See page 95) or that are listed in the SAL with the PIOCARD FRU?v No: Use the failing item list that you were using when you started this procedure.v Yes: The multi-adapter bridge is failing. Remove symbolic FRU PIOCARD from the list of failingitems, it is not the failing FRU.Bus PIP MAB-03: For use by authorized service providers.BUS PIP MAB-03: Isolate to failing multi-adapter bridge resourceUse this procedure to isolate a failing I/O processor or I/O adapter under a multi-adapter bridge. Theprocedure will iterate through each IOP under the multi-adapter bridge, powering each one off, and thenresetting the multi-adapter bridge. This process will be repeated until the failing part is isolated.1. Does the system IPL to DST?v Yes: Go to the SST/DST display in the partition which reported the problem. Use STRSST ifOS/400 is running, use function 21 if STRSST does not work, or IPL the partition to DST. Then,continue with the next step.v No: Perform “Bus PIP MAB-04” on page 97.This ends the procedure.2. On the Start Service Tools Sign On display, type in a User ID with QSRV authority and Password.3. Select Start a service tool —> Hardware service manager —> Logical hardware resources —>System bus resources.4. Page forward until you find the multi-adapter bridge where the problem was reported. For help inidentifying the multi-adapter bridge from the Direct Select Address (DSA) in the SRC, see HardwareAnalyze hardware problems 95
