IBM RS6000 Service Guide - Page 94

Table 3-1 (Page 21 of 24). Firmware Error Codes. Error Code Description 40D00003 An unknown slow shutdown commanded. 40D00004 4B200054 4B200055 An unknown fast shutdown commanded. The CPU cards are not compatible with each other (i.e. one is a 166MHz and the other is a 332MHz) No CPU card in first slot. 4B201000 Checkstop 4B2xxx10 Machine Check 4B201020 TEA Error Action / Possible Failing FRU Critical cooling problem. Check to ensure the the temperature is in the ambient range Locked fan failure detected. Make sure all fans are operating normally. 1. Remove cards 2. Verify part numbers 3. Install valid cards 1. If only one processor card is used, it must be in slot #1. 2. If two processor cards are being used, replace the card in slot #1. 1. Attempt to reboot the system in Service Mode, this preserves the AIX error log. If the reboot fails, attempt to reboot from the CD-ROM. If the reboot is successful, run Diagnostics in Problem Determination mode to determine the cause of the failure. Otherwise continue. 2. CPU Card. 3. System Board. 4. PCI Adapter. 5. I/O board. (See notes on 3-1.) 1. Attempt to reboot the system in Service Mode, this preserves the AIX error log. If the reboot fails, attempt to reboot from the CD-ROM. If the reboot is successful, run Diagnostics in Problem Determination mode to determine the cause of the failure. Otherwise continue. 2. Refer to map 1540 in the system unit's Service Guide. Refer to map 1540 in the system unit's Service Guide. 3-22 Service Guide