Brand: FUJITSU
Category: Computers
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for LIFEBOOK T939
Uploaded: Nov. 21, 2025, 6:22 p.m.
Manual Publish Date: 2019-05-01
Warranty Information
No specific warranty period is mentioned in the provided pages.
Your FUJITSU LIFEBOOK T939 is designed for reliability and convenience. It boots quickly and offers a long operating time thanks to its high-capacity battery. The "BIOS Setup Utility" allows you to manage hardware and protect your system with passwords. The manual covers initial setup, daily operation, security features, connecting external devices, component removal/installation, BIOS settings, troubleshooting, and technical data. It also includes important safety notes and information on disposal and recycling.
Troubleshooting and error codes
| Error message/cause | Resolution |
| CMOS battery bad | Contact your sales outlet or our customer service centre. |
| If the error message occurs repeatedly, the buffer battery in the notebook is flat. | Contact your sales outlet or our customer service centre. |
| System CMOS checksum bad - default configuration used | Switch the notebook off. Switch the notebook on. Press the function key F2 to access the BIOS Setup. In the BIOS Setup, select the Exit menu. Select the entry Load Setup Defaults. Select OK and press the Enter key. |
| The system configuration information is incorrect. | Switch the notebook off. Switch the notebook on. Press the function key F2 to access the BIOS Setup. In the BIOS Setup, select the Exit menu. Select the entry Load Setup Defaults. Select OK and press the Enter key. |
| Extended memory failed at offset: xxxx Failing Bits: ZZZZ ZZZZ | Check whether the additional memory module has been inserted correctly. |
| When testing the extended memory an error has resulted at the address xxxx. | Check whether the additional memory module has been inserted correctly. |
| Failure Fixed Disk n | Start the BIOS Setup (Primary Master submenu) and select the correct settings. |
| The settings of the hard disk drive are incorrect. | Start the BIOS Setup (Primary Master submenu) and select the correct settings. |
| Keyboard controller error | Switch the notebook off using with the ON/OFF button. Wait 3 - 5 seconds and switch on the notebook again. |
| Keyboard error | If you are using an external keyboard: Check the connection and reboot the notebook. |
| nn Stuck key | Make sure that no key is pressed. |
| Operating system not found | Check in the BIOS Setup whether your hard disk has been set correctly. Make sure that the operating system is installed on the corresponding drive. |
| Press <F1> to resume, <F2> to SETUP | Press the F1 function key to start the operating system. Press the function key F2 to access the BIOS Setup. |
| This error message appears if an error occurs during the self-test before starting the operating system. | Press the F1 function key to start the operating system. Press the function key F2 to access the BIOS Setup. |
| Previous boot incomplete - Default configuration used Due to an error during the previous system boot, default values were used for certain settings. Check the settings in the BIOS Setup. | Press the F1 function key when prompted to do so. |
| Real time clock error | Contact your sales outlet or our customer service centre. |
| nnnnK Shadow RAM failed at offset: xxxx Failing Bits: zzzz | Contact your sales outlet or our customer service centre. |
| System battery is dead - Replace and run SETUP | Contact your sales outlet or our customer service centre. |
| System cache error - Cache disabled | Contact your sales outlet or our customer service centre. |
| System timer error | Contact your sales outlet or our customer service centre. |