Hi Hasan,
Sorry if this is too late. If you're still working on this, here are two things to try:
* Use the SANE driver if you can: http://www.sane-project.org/
The driver controls the calibration and the open source driver is probably not as strict as the official one.
* Unplug the motor and front assembly, everything except the scan bar. The front assembly has a limit sensor which is probably waiting to be triggered, but it works for me if it's unplugged.
You'll still need to provide a white surface when the scanner first starts up, but after that it should work.
Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ