IBM 8671 - Eserver xSeries 235, Maintenance And Troubleshooting Manual

Page: 167 / 222

Bus fault messages
Note: See “System” on page 162 to determine which components should be replaced by a field service technician.
Bus fault messages Message Action
Failure reading 12C device.
Check devices on bus 0.
1. If installed, reseat the I2C cable between Remote Supervisor
Adapter (in PCI slot 1/J32) and system board (J45).
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 (J24).
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) (J10).
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
(J10) of system board.
2. DASD backplane.
3. System board.
Failure reading I2C device.
Check device on bus 4.
v System board
Undetermined problems
Use the information in this section if the diagnostic tests did not identify the failure,
the devices list is incorrect, or the system is inoperative.
Notes:
1. Damaged data in CMOS can cause undetermined problems.
2. Damaged data in BIOS code can cause undetermined problems.
Check the LEDs on all the power supplies. If the LEDs indicate the power supplies
are working correctly, complete the following steps:
1. Turn off the server.
2. Be sure the server is cabled correctly.
3. Remove or disconnect the following devices (one at a time) until you find the
failure (turn on the server and reconfigure each time):
Any external devices
Surge suppressor device (on the server)
Modem, printer, mouse, or non-IBM devices
Each adapter
Drives
Memory modules (minimum requirement = 256 MB (2 banks of 128 MB
DIMMs))
Note: Minimum operating requirements are:
a. One power supply
b. Power cage assembly, if installed.
Chapter 6. Symptom-to-FRU index
157