IBM 689912U Hardware Maintenance Manual - Page 12

General Checkout (Type 62XX, 65XX, 68XX) This general checkout procedure is for Type 62XX, 65XX, and 68XX computers. If you are servicing a Type 6272 Model 88X, 89X, 90X, 91X, computer, see "General Checkout (Type 6272 Models 88X, 89X, 90X, 91X)" on page 5. If you are servicing a Type 6275, 6285, 6561, 6591, 6862, 6889, 6892, or 6893 computer, see General Checkout on page 14 If you are servicing a Type 6876 or Type 6886 Micro Channel computer, see "General Checkout (Type 6876, 6886)" on page 17. 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 "Return Codes" on page 214. 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 1. Before replacing any FRUs, ensure 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 200. 2. If multiple error codes are displayed, diagnose the first error code displayed. 3. If the computer hangs with a POST error, go to "Symptom-to-FRU Index" on page 32. 4. If the computer hangs and no error is displayed, go to "Undetermined Problem" on page 81. 5. If an installed device is not recognized by the diagnostics program, that device might be defective. 2 IBM PC 300/700, IntelliStation Series HMM