IBM 8682 manual Undetermined problems

Undetermined problems

You are here because the diagnostic tests did not identify the failure, the Devices List is incorrect, or the system is inoperative.

Note: A corrupt CMOS can cause undetermined problems.

Check the LEDs on all the power supplies, see“Power supply LED errors” on

page 110 If the LEDs indicate the power supplies are working correctly, return here and do the following:

1.Power-off the computer.

2.Be sure the system is cabled correctly.

3.Remove or disconnect the following (one at a time) until you find the failure (power-on the computer and reconfigure each time).

Any external devices

Surge suppressor device (on the computer) Modem, printer, mouse, or non-IBM devices Each adapter

Drives

Memory-Modules (Minimum requirement = 512 MB (4x128 MB DIMMs))

Note: Minimum operating requirements are:

a.1 Power Supply

b.Power Backplane

c.System Board (with pins 2 and 3 on J23 connected together to bypass the power switch; default is pins 1 and 2)

d.1 Microprocessor

e.1 Terminator Card in Slot 4

f.Memory Module (with a minimum of 1 bank of 128 MB DIMMs (128x4))

4.Power-on the computer. If the problem remains, suspect the following FRUs in the order listed:

Power Supply Power Backplane 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.

2.If you suspect a networking problem and all the system tests pass, suspect a network cabling problem external to the system.

122IBM xSeries 350 Type 8682: Hardware Maintenance Manual