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Chapter 1. General Checkout

This general checkout procedure is for Types 2254, 2256, 2257, 6336, 6337, 6339, 6341,

6342, 6346, 6347, and 6348 computers.

Diagnostic error messages appear when a test program finds a problem with a

hardware option. For the test programs to properly determine if a test Passed, Failed or

Aborted, the test programs check the error-return code at test completion. See

“Diagnostics” on page 12.

General error messages appear if a problem or conflict is found by an application

program, the operating system, or both. For an explanation of these messages, refer to

the information supplied with that software package.

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1. Power-off the computer and all external devices.

2. Check all cables and power cords.

3. Make sure the system board is seated properly.

4. Set all display controls to the middle position.

5. Power-on all external devices.

Attention:

The drives in the computer you are servicing might have been rearranged or the drive startup

sequence changed. Be extremely careful during write operations such as copying, saving or

formatting. Data or programs can be overwritten if you select an incorrect drive.

Notes:

•

Types 2254, 2256, 2257, 6336, 6337, 6339, 6341, 6342, 6346, 6347, and 6348

computers default to come up quiet (no beep and no memory count and checkpoint code

display) when no errors are detected by POST.

• To enable beep and memory count and checkpoint code display when a successful POST

occurs, do the following:

1. Select Start Options in the Configuration/Setup Utility program (see “Setup Utility

program” on page 10).

2. Set Power-On Self-Test to Enhanced.

• Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system.

A down-level BIOS might cause false errors and unnecessary replacement of the system

board. For more information on how to determine and obtain the latest level BIOS, see

“BIOS levels” on page 193.

• If multiple error codes are displayed, diagnose the first error code displayed.

• If the computer hangs with a POST error, go to "Symptom-to-FRU Index" on page 71.

• If the computer hangs and no error is displayed, go to “Undetermined problems” on page

109.

• If an installed device is not recognized by the diagnostics program, that device might be

defective.

IBM 6339 Hardware Maintenance Manual

Other manuals for IBM 6339