Canon CanoScan 9950F Flatbed Scanner "lens calibration" Questions

...lens for scratches. If its scratched like mine, the entire module has to be replaced to fix it. The canon part number is MH7-7038 and they range from $125-$160 if you replace it yourself. The one in ...

Recalibrate scanner using clean calibration sheet. If line still persists remove back cover and slide out mirror/camera assembly. use canned compressed air to clean mirrors and finally the camera lens

...calibration after repeated tries you most likely have broken the lens or the image sensor is no longer working. If that is the case then there isn't much you can do i would suggest contacting the ...

...happened about a year ago and we solved it. It has returned, but don't remember our solution the lens , glass inside your scanner is dirty with dust you need to clean this up and calibrate once ...

...calibration and the red light doesn't go off. Tried changing the batteries and taking out batteries to reset unit. NOTHING works. There are no other instructions for troubleshooting, so what next? ...