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MAP 154A: I2C Bus Problem Isolation
Step 154A-1
Record the error code, location code(s) and word 13 that sent you to this MAP.
Step 154A-2
Turn off the power.
Step 154A-3
Examine the following table and locate the error code that sent you to this MAP to determine your next
step.
Error Code
B1xx 4643
1011 8400, 1011 8401, 1011 8402, 1011 840A,
1011 840B, B1xx 4644, B1xx 4645, B1xx 4646,
B1xx 4648, 1011 8409,
406x 0CA5
Step 154A-4
Replace the following cards, if present, one at a time:
v First location code item recorded, if any, in "Step 154A-1."
v Second location code item recorded, if any, in "Step 154A-1."
v RIO connector card 1 at location U0.1-P1-H1, if not recorded in "Step 154A-1."
v RIO extender card 1 at location U0.1-P1-H1.1, if not recorded in "Step 154A-1."
v RIO connector card 2 at location U0.1-P1-H2, if not recorded in "Step 154A-1."
v RIO extender card 2 at location U0.1-P1-H2.1, if not recorded in "Step 154A-1."
v Processor card at location U0.1-P1-C1 if not recorded in "Step 154A-1."
v All memory DIMMS on processor card 1 at location U0.1-P1-C1-Mn (n equals 1 to 8), if not recorded in
"Step 154A-1."
v Processor card at location U0.1-P1-C2, if not recorded in "Step 154A-1."
v All memory DIMMS on processor card 2 at location U0.1-P1-C2-Mn (n equals 1 to 8), if not recorded in
"Step 154A-1."
v Processor card at location U0.1-P1-C3, if not recorded in "Step 154A-1."
v All memory DIMMS on processor card 3 at location U0.1-P1-C3-Mn (n equals 1 to 8), if not recorded in
"Step 154A-1."
v Processor card at location U0.1-P1-C4, if not recorded in "Step 154A-1."
v All memory DIMMS on processor card 4 at location U0.1-P1-C4-Mn (n equals 1 to 8), if not recorded in
"Step 154A-1."
v Replace the service processor/PCI backplane at U0.1-P2, if not recorded in "Step 154A-1."
v Operator panel at U0.1-L1, if not recorded in "Step 154A-1."
v DASD backplane at U0.1-P4, if not recorded in "Step 154A-1."
v Media backplane at U0.1-P5, if not recorded in "Step 154A-1."
v Base system power supply 1 at U0.1-V1, if not recorded in "Step 154A-1."
v Base system power supply 2 at U0.1-V2, if not recorded in "Step 154A-1."
v Processor bus connector at U0.1-P3, if not recorded in "Step 154A-1."
Step 154A-5
Turn on the power.
Step 154A-6
Did the system stop with the same error code as recorded in "Step 154A-1"?
No
The card just replaced was defective. This ends the procedure.
Action
Go to "Step 154A-8" on page 178.
Go to "Step 154A-4."
Go to "Step 154A-19" on page 179.
Chapter 3. Maintenance Analysis Procedures
177
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