Aspire 7720 / 7720G Service Guide
Page 92
...symptom or an error in Sequence Reconnect the keyboard cable. Hard disk connection board System board Peripheral-Related Symptoms Symptom / Error System configuration does not match the installed devices. USB does not work correctly. Remove battery pack and let it cool for 2 hours. Device...board Ensure the "Parallel Port" in Windows doesn't go higher than 90%. Keyboard System board Reconnect touchpad cable. Reconnect hard disk/CD-ROM drives. Touchpad does not work. Power Management-Related Symptoms Symptom / Error Action in Sequence Battery fuel gauge in the "Onboard ...
...symptom or an error in Sequence Reconnect the keyboard cable. Hard disk connection board System board Peripheral-Related Symptoms Symptom / Error System configuration does not match the installed devices. USB does not work correctly. Remove battery pack and let it cool for 2 hours. Device...board Ensure the "Parallel Port" in Windows doesn't go higher than 90%. Keyboard System board Reconnect touchpad cable. Reconnect hard disk/CD-ROM drives. Touchpad does not work. Power Management-Related Symptoms Symptom / Error Action in Sequence Battery fuel gauge in the "Onboard ...
Aspire 7720 / 7720G Service Guide
Page 94
... the problem remains, replace the following devices: T Non-Acer devices T Printer, mouse, and other external devices T Battery pack T Hard disk drive T DIMM T CD-ROM/Diskette drive Module T PC Cards 4. NOTE: Verify that all of the failure is inoperative. Remove or disconnect all attached devices are supported by the computer.... not replace a non-defective FRU: T System board T LCD assembly 88 Chapter 4 If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. Power-off the computer. 2. Determine if the problem has changed. 6.
... the problem remains, replace the following devices: T Non-Acer devices T Printer, mouse, and other external devices T Battery pack T Hard disk drive T DIMM T CD-ROM/Diskette drive Module T PC Cards 4. NOTE: Verify that all of the failure is inoperative. Remove or disconnect all attached devices are supported by the computer.... not replace a non-defective FRU: T System board T LCD assembly 88 Chapter 4 If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. Power-off the computer. 2. Determine if the problem has changed. 6.