Chapter 1. General Checkout; General Checkout - IBM 2179 Hardware Maintenance Manual

Chapter 1. General checkout

General Checkout

This general checkout procedure is for types 2179 and 6643 computers.
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.
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
"IBM PC Enhanced Diagnostics" on page 6.
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.
Notes:
Use Beep codes and the IBM Enhanced Diagnostics to diagnose and fix problems.
1. Types 2179 and 6643 computers default to come up quiet (no beep and no memory count and checkpoint code
display) when no errors are detected.
2. 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 71.
3. If there is a Beep code, go to "Beep symptoms" on page 35.
4. If multiple error codes are displayed, diagnose the first error code displayed.
5. If the computer hangs with a POST error, go to "POST error codes" on page 54.
6. If the computer hangs and no error is displayed, go to "Undetermined problems" on page 56.
7. If an installed device is not recognized by the diagnostics program, that device might be defective.
1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Set all display controls to the middle position.
4. Insert the IBM Enhanced Diagnostics diskette into drive A or the CD into the
5. Power-on all external devices.
6. Power-on the computer.
7.
DID YOU RECEIVE THE CORRECT RESPONSE?
© Copyright IBM Corp. 2004
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CD drive.
Check for the following response:
a. One or two beeps (depending on the diagnostics version level).
b. Readable instructions or the Main Menu.
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