IBM x3950 Problem Determination And Service Manual page 88

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 8878 and 8879," on page 109 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Error code Description
166-201-005 ISMP indicates I2C errors on bus S.
166-201-006 ISMP indicates I2C errors on bus O.
166-201-007 ISMP indicates I2C errors on bus M0.
166-201-008 ISMP indicates I2C errors on bus M1.
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IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide
Action
1. Reseat the following components:
a. SAS hard disk drive backplane cables
b. I/O board
2. Replace the following components one at a time,
in the order shown, restarting the server each
time.
a. SAS hard disk drive backplane
b. I/O board
1. Reseat the following components:
a. (Trained service technician only) Operator
information panel
b. I/O board
2. Replace the components listed in step 1 one at a
time, in the order shown, restarting the server
each time.
1. Reseat the following components:
a. Memory card
b. I/O board
c. Microprocessor tray
2. Replace the following components one at a time,
in the order shown, restarting the server each
time.
a. Memory card
b. I/O board
c. (Trained service technician only)
Microprocessor tray
1. Reseat the following components:
a. Memory card
b. I/O board
c. Microprocessor tray
2. Replace the following components one at a time,
in the order shown, restarting the server each
time.
a. Memory card
b. I/O board
c. (Trained service technician only)
Microprocessor tray