IBM 867431X Hardware Maintenance Manual - Page 127

Symptom-to-FRU index This index supports Types 8674 and 6851 systems. The Symptom-to-FRU lists symptoms, errors, and the possible causes. The most likely cause is listed first. Use this Symptom-to-FRU index to help you decide which FRUs to have available when servicing the computer. The POST BIOS displays POST error codes and messages on the screen. Beep symptoms Beep symptoms are short tones or a series of short tones separated by pauses (intervals without sound). See the following examples. Beeps 1-2-3 4 Note: One beep after successfully completing POST indicates the system is functioning properly. Description v One beep v A pause (or break) v Two beeps v A pause (or break) v Three Beeps Four continuous beeps Beep/Symptom FRU/Action 1-1-2 (Processor register test failed) 1. Optional Processor (if installed) 2. Processor 1-1-3 (CMOS write/read test failed) 1. Battery 2. System Board 1-1-4 (BIOS EEPROM checksum failed) 1. DIMM 2. System Board 1-2-1 (Programmable Interval Timer 1. System Board failed) 1-2-2 (DMA initialization failed) 1. System Board 1-2-3 (DMA page register write/read 1. System Board failed) 1-2-4 (RAM refresh verification failed) 1. DIMM 2. System Board 1-3-1 (1st 64K RAM test failed) 1. DIMM 2. System Board 1-3-2 (1st 64K RAM parity test failed) 1. DIMM 2. System Board © Copyright IBM Corp. 2001 119