Acer 721TX Service Guide - Page 101

Symptom / Error Keyboard (one or more keys) does not work. Power shuts down during operation. The system will not poweron. The system will not poweroff. Battery can't be charged. System cannot detect the PCMCIA. Memory count (size) appears different from actual size. Speakers have noise or no sound comes from system. The system will not enter Hibernation. The system will not enter Standby after closing the LCD. Battery fuel gauge does not go higher than 90%. System configuration does not match the installed devices. System hangs intermittently. FRU / Action in Sequence 1. Reseat the keyboard cable. 2. Keyboard 3. System board 1. Battery 2. AC Adapter 3. DC/DC & Charge board 4. System board 1. Battery 2. AC adapter 3. DC/DC & Charge boar 4. System board 1. DC/DC & Charge board 2. System board 1. Battery 2. DC/DC & Charge board 3. IDE board 4. System board PCMCIA slots assembly System board 1. Enter BIOS Utility to execute load setup default settings, then reboot system. 2. DIMM 3. System board 1. Speaker 2. System board 1. Keyboard (if control is from the keyboard) 2. Hard disk 3. System board 1. LCD cover switch 2. System board 1. Remove battery pack and let it cool for 2 hours. 2. Refresh battery (continue to use battery until power off, then charge battery). 3. Battery 4. DC/DC & charge board 5. System board 1. Enter BIOS Utility to execute load setup default settings, then reboot system. 2. Reseat CD-ROM/DVD module. 1. Hard Disk/CD-ROM/DVD drive connector 2. Fan 3. System board Chapter 4 93