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 8864,” on page 23 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 Action
166-201-001 ISMP indicates I2C errors on bus P.
1. Reseat the following components:
a. (Trained service technician only) Power
backplane
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. (Trained service technician only) Power
backplane
b. I/O board
c. (Trained service technician only)
Microprocessor tray
166-201-002 ISMP indicates I2C errors on bus I. Reseat and, if necessary, replace the I/O board.
166-201-003 ISMP indicates I2C errors on bus C.
1. Reseat the following components:
a. Microprocessor tray
b. I/O board
2.
Replace the following components one at a time,
in the order shown, restarting the server each
time.
a. (Trained service technician only)
Microprocessor tray
b. I/O board
166-201-004 ISMP indicates I2C errors on bus M.
1. Reseat the following components:
a. I/O board
b. Memory card
c. Microprocessor tray
2.
Replace the following components one at a time,
in the order shown, restarting the server each
time.
a. I/O board
b. Memory card
c. (Trained service technician only)
Microprocessor tray
166-201-005 ISMP indicates I2C errors on bus S.
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
122 IBM System x3850 Type 8864: Problem Determination and Service Guide
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