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I have many years repairing Canon scanners and here is my suggestion to you.
If you are positive the lock switch is unlocked then I think what happened is the scanner inside the scanner is off its track an can not move. I would remove the glass on the top of your flat bed scanner to gain access to the scanner lens then I would try and move the scanner lens manually with the power off to the scanner. If it does move freely then I would think you have a bad scanner lens. If it doesnt move freely try and reposition the lens back on to its track. They some times jump off there track from shipping.
It is normal for this scanner to briefly "scan" when it is plugged in. However, the moving lens shouldn't go all the way down to the back end. It sounds like the scanner is physically damaged, most likely the belt slipped several cogs and now the scanning mechanism is out of alignment. Look into warranty service for the unit.
The problem is going to be with the bulb itself. The scaner you are using is not made to do such precise work. The bulb itself is undersized for such a large scale job. You can look into upgrading the bulb of your scanner but I would not sudgest it unless you go to an authorized dealer/maint contractor for your Microtek to find the proper upgrade.
If you set Automatic brightness/Contrast this happens. Try manual setting. Adjust different settings and select the best suited for a particular type of drawing. The scanner takes couple of milliseconds to judge the best lighting, by then the paper has moved little. This area appears black. This is easily solvable.