Try to search inside scanner when you raise up flatbed cover
SOURCE: Unlock
i fixed mine, take off the blue lid and there are two screws at the back of the scanner, take them out and Robert is your mothers brother.
SOURCE: xerox 6110 MFP scanner locked
The Xerox 6110 MFP has a green 'lock/unlock' slider on the "roof" of the "out" paper tray (under the front control pannel assembly); see images below. When slide to the back, it locks the scanner, and to the front unlocks it.
Front of the Xerox 6110MFP howing paper output tray and control panel.
Xerox 6110MFP showing the output paper tray and the 'green' scanner slide lever in the roof of the tray.
SOURCE: Scanner Locked Error
Scanner Lock -- a possible quicker fix
Instead of removing the entire glass plate, just remove the narrow glass strip to the far left. To do this, open the scanner top revealing the glass, and remove the philips screw centered on the left edge. With a thin flat-head screwdriver or even a good set of fingernails, you can then pry out the thin U-shaped plastic piece holding the glass strip in place.
When you remove the glass strip, you now have (narrow but sufficient) access to the scanner pulley and belt. Pull the spring-loaded pulley back towards your right to get some slack on the belt, then remove the belt from the pulley.
This frees up the scanner head, which you can now slide manually (by pulling gently on one end of the belt and giving slack on the other) to a center position well away from the scanner lock. When I first tried, I didn't move the scanner head far enough -- to the middle or beyond seems sufficient.
Push the scan lock to the full lock and then the full unlock position, to make sure it is now free.
Using fingers, screwdriver, and/or pliers, re-seat the belt on the pulley, once again using the freedom to move the spring-loaded pulley a bit to the right.
Replace the glass strip, plastic cover, and screw.
Power on the scanner. The error message should now be gone, and the scanner head should slide back to its resting position on startup (unless something is caught underneath, which was apparently the case for some who had this problem but was not the case for me). If the first power cycle doesn't do the trick, another power cycle might be helpful.
This approach eliminates the need to remove the scanner lid, control panel, and scanner glass.
I had the exact same problem with another scanner (LiDE 80) after years of use. It stopped being able to calibrate itself so I couldn't use it on computers where it had never been installed on before (since on freshly installed computers, the driver requires calibration to be carried out at least once).
Hopefully my solution will work on the 500F, albeit with some modifications you'll have to figure out yourself. :P
What I did was open it up, the two strips of plastic to the left and right of the platen can be used to remove the glass surface:
1. release the oval catch at the front of each strip by prying them upwards.
2. slide the glass towards the front of the scanner a bit till a gap appears between the end of each strip and the back of the scanner.
3. pry a bit of the back of both strips upwards and keep them away from the glass so they won't stopped by the back of the scanner.
4. slide the glass all the way to the back, you should be able to remove the glass since the two plastic strips aren't blocked anymore.
The reason the scanner fails to calibrate is because it tries looking for the black/white strip hidden between the plastic case and glass panel at the front but fails. There are three possible reasons:
1. Dirty glass panel/damaged black/white strip
2. Covered/dirty CIS module
3. Loose drive belt
Mine was a combination of the first three. A little washing and thorough drying of the glass panel and black/white strip and careful wiping of the imaging element and led strips (the black bar is the imaging element and the white bar is the led strips) fixed the problem.
I didn't have a loose drive belt, so I didn't look into fixing that, but I see a spring loaded catch holding the drive belt tension; if you have a loose belt, it may be worth it looking into that.
A tip of advice: If somehow, after reassembling your scanner after tinkering with it it still refuses to calibrate, you can do a dirty workaround by doing the calibration with the scanner disassembled and placing the black/white strip manually above the CIS module at the front, making sure to hold it steady. Your images will look a bit muted, but at least it works! (I did this step before I reassembled the scanner just in case it wasn't fixed, but thankfully its working now!)
Front of the Xerox 6110MFP howing paper output tray and control panel.
Xerox 6110MFP showing the output paper tray and the 'green' scanner slide lever in the roof of the tray.
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