IBM 866251Y - Netfinity 5500 M20, Hardware Maintenance Manual

Page: 333 / 386

Undetermined problems
You are here because the diagnostic tests did not identify
the failure, the Devices List is incorrect, or the system is
inoperative.
Notes
1. If you suspect a software mismatch is causing
failures (solid or intermittent), be sure to see
“Resolving configuration conflicts” on page 33.
2. A corrupt CMOS can cause undetermined
problems.
Check the LEDs on all the power supplies, see “Power
supply LED errors” on page 301. 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).
Ÿ
Any external devices
Ÿ
Surge suppressor device (on the computer)
Ÿ
Modem, printer, mouse, or non-IBM devices
Ÿ
Each adapter
Ÿ
Drives
Ÿ
Memory-Modules (Minimum requirement = 1
bank of 128 MB DIMMs)
Note
Minimum operating requirements are:
Power Supply
Power Backplane
System Board (With pins 2 and 3 on J32's
extension cable connected together to
bypass the power switch. The default is
pins 1 and 2.)
Processor Board (Verify that the J32, J33,
and J35 connectors are installed correctly.)
Memory Module (With a minimum of 1 bank
of 128 MB DIMMs)
1 Microprocessor and VRMs
3 Terminator Cards
4. Power-on the computer. If the problem remains,
suspect the following FRUs in the order listed:
Ÿ
Power Supply
Ÿ
Power Backplane
Ÿ
System Board
Ÿ
Processor Board
Netfinity 5500 M20 - Type 8662
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