IBM 689912U Hardware Maintenance Manual - Page 42

Symptom-to-FRU Index The Symptom-to-FRU Index lists error symptoms and possible causes. The most likely cause is listed first. Always begin with "General Checkout (Type 62XX, 65XX, 68XX)" on page 2. This index can also be used to help you decide which FRUs to have available when servicing a computer. If you are unable to correct the problem using this index, go to "Undetermined Problem" on page 81. Notes If you have both an error message and an incorrect audio response, diagnose the error message first. If you cannot run the diagnostic tests or you get a diagnostic error code when running a test, but did receive a POST error message, diagnose the POST error message first. If you did not receive any error message, look for a description of your error symptoms in the first part of this index. Check all power supply voltages before you replace the system board. (See "Power Supply" on page 28.) Check the hard disk drive jumper settings before you replace a hard disk drive. (See "Hard Disk Drive Jumper Settings" on page 195.) Important 1. Some errors are indicated with a series of beep codes. (See "Beep Symptoms" on page 33.) 2. Type 6275, 6285, 6561, 6591, 6862, 6889, 6892, 6893 computers are 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: a. Enable Power on Status in setup. See "Setup Utility Program" on page 220. 3. The processor is a separate FRU from the system board; the processor is not included with the system board FRU. (See "Replacing a System Board" on page 83.) 32 IBM PC 300/700, IntelliStation Series HMM