Acer 721TX Service Guide - Page 98

Symptom / Error 0220 Monitor type does not match CMOS - Run Setup 0230 Shadow RAM Failed at offset: nnnn 0231 System RAM Failed at offset: nnnn 0232 Extended RAM Failed at offset:nnnn 0250 System battery is dead Replace and run Setup 0251 System CMOS checksum bad - Default configuration used 0260 System timer error 0270 Real time clock error 0280 Previous boot incomplete Default configuration used 0281 Memory size found by POST differed from CMOS 02B0 Diskette driver A error 02B2 Incorrect Drive A type - run SETUP FRU / Action in Sequence Run "Load Setup Defaults" in BIOS Setup Utility. 1. BIOS ROM 2. System board 1. DIMM 2. System board 1. DIMM 2. System board Replace backup battery (RTC) and Run SETUP to reconfigure System time, then reboot system. 1. Backup battery (RTC) 2. Run SETUP to reconfigure System, then reboot system. 1. Backup battery (RTC) 2. Run SETUP to reconfigure System, then reboot system. 3. System board 1. Backup battery (RTC) 2. Run SETUP to reconfigure System, then reboot system. 3. System board 1. Run "Load Setup Defaults" in BIOS Setup Utility. 2. Backup battery (RTC) 3. System board 1. Run "Load Setup Defaults" in BIOS Setup Utility. 2. DIMM 3. System board 1. Check that the drive is defined with the proper diskette type in Setup. 2. Go to "Diskette Drive Checkout". 1. Check that the drive is defined with the proper diskette type in Setup. 2. Go to "Diskette Drive Checkout". 90 Troubleshooting