IBM xSeries 236 8841, User Manual

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Host built-in self test (BIST)
Note: See “System replaceable units” on page 144 to determine which components should be replaced by a field
service technician.
Message Action
Host fail
(level-informational; built-in self-test for the
host failed)
1. Reseat the microprocessor.
2. Reseat the VRM.
3. Replace the microprocessor CPU.
Bus fault messages
Note: See “System replaceable units” on page 144 to determine which components should be replaced by a field
service technician.
Bus fault messages Action
Failure reading 12C device.
Check devices on bus 0.
1. If installed, reseat the I2C cable between Remote Supervisor
Adapter and system board.
2. Memory DIMMs.
3. System board.
Failure reading 12C device.
Check devices on bus 1.
1. Reseat the I2C cable between the operator information panel
and system board.
2. Operator information panel.
3. System board.
Failure reading 12C device.
Check devices on bus 2.
1. Reseat the cable between system board and the power supply
(power cage assembly, if installed).
2. Power cage assembly, if installed.
3. Power supply.
4. System board.
Failure reading 12C device.
Check devices on bus 3.
1. Reseat the cable between the DASD backplane and connector
of system board.
2. DASD backplane.
3. System board.
Failure reading I2C device.
Check device on bus 4.
v System board
Chapter 6. Symptom-to-FRU index
139