IBM 7163, Problem Determination And Service Manual

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Solving undetermined problems
If the diagnostic tests did not diagnose the failure or if the server is inoperative, use
the information in this section.
If you suspect that a software problem is causing failures (continuous or
intermittent), see “Software problems” on page 110.
Damaged data in CMOS memory or damaged BIOS code can cause undetermined
problems. To reset the CMOS data, use the power-on password jumper to override
the power-on password and clear the CMOS memory; see “I/O board jumpers” on
page 9. If you suspect that the BIOS code is damaged, see “Recovering from a
BIOS update failure” on page 138.
Check the LEDs on all the power supplies (see “Power-supply LEDs” on page 119).
If the LEDs indicate that the power supplies are working correctly, complete the
following steps:
1. Check the operator information panel and light path diagnostics LEDs.
2. View error logs.
3. Turn off the server.
4. Make sure that the server is cabled correctly.
5. Remove or disconnect the following devices, one at a time, until you find the
failure. Turn on the server and reconfigure it each time.
v Any external devices.
v Surge-suppressor device (on the server).
v Modem, printer, mouse, and non-IBM devices.
v Each adapter.
v Hard disk drives.
v Memory modules. The minimum configuration requirement is 1 GB (two 512
MB DIMMs).
v
Baseboard management controller.
6. Turn on the server. If the problem remains, suspect the following components in
the following order:
a. I/O board
b. Microprocessor/memory cards
If the problem is solved when you remove an adapter from the server but the
problem recurs when you reinstall the same adapter, suspect the adapter; if the
problem recurs when you replace the adapter with a different one, suspect the I/O
board.
If you suspect a networking problem and the server passes all the system tests,
suspect a network cabling problem that is external to the server.
Problem determination tips
Due to the variety of hardware and software combinations that can be encountered,
use the following information to assist you in problem determination. If possible,
have this information available when requesting assistance from Service Support
and Engineering functions.
v Machine type and model
v
Microprocessor or hard disk upgrades
v Failure symptom
– Do diagnostics fail?
– What, when, where, single, or multiple systems?
Chapter 5. Diagnostics
175