IBM eServer xSeries 205 Type 8480, Hardware Maintenance Manual And Troubleshooting Manual

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Note: See “System” on page 110 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 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.
c. System board
d. One microprocessor and VRM
e. Memory module (with a minimum of two 128 MB DIMMs)
4. Turn on the server. If the problem remains, suspect the following FRUs in the
order listed:
Power supply
Power cage assembly, if installed
System board
Notes:
1. If the problem goes away when you remove an adapter from the system and
replacing that adapter does not correct the problem, suspect the system board.
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IBM xSeries 205 Type 8480: Hardware Maintenance Manual and Troubleshooting Guide