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You may need to lubricate the moving parts. I had a printer that was playing up like this and the bars that the print head moved on needed a tissue with a small quantity of machine oil to be rubbed on the bar to allow the print head to move freely. If all the scanners are the same age the lubrication they had may have worn off.
The scanner is not able to find the home position to start.
Hence open the scanner and check to make sure the scanner assy. is moving to the end and when it senses the home position it will try to move a little away from it and then return back. But if the sensor is dirty or broken it will make a loud noise like belt slipping.
Try to find the sensor on back of the Tube assy. and try to fix it.
If the scanner's 'clicking' sound is louder than usual, plus there's issues with the scanning carriage, it is quite evident that this device requires repair/parts replacement. Please note that I'm highly recommending a certified or trained technician to do such job due to the intricacy of internal parts (not to mention the architecture) of the scanner.
For your convenience, I have included the support site for Lexmark for you to check on the repair options and more information surrounding the product :
If the noise is a high pitched whirrrrr, it is the scanner warming up and getting ready for the scan job. If it clunks, or the noise "sounds bad", make sure the "Lock" is not engaged on the bottom of the scanner.
Epson Perfection V500 installed. My computer recognizes it and diagnostic note says all okay. B ut when I turn on the power of the scanner, the grren light comes on in the front for about 15-20 seconds and then the scanner makes a loud grating noise and the green light turns orange and keeps flashing. No scan is attempted. TGhe noise sounds like something that should be moving can get started -- but nothing moves when you look at it. Should I take it back where I bought it?
It is normal for your Epson scanner to produce noise on startup as it calibrates the motor that moves the scan mechanism when powered on. But if this is too loud than normal, it means that there may be already a problem with the motor and must be replaced if it wouldn't give out quality scans. Otherwise, it is working normally.
Clicking sound is not a healthy sound, check if any gear wheel is damaged. Is the tray moving up properly? There are a few sensitive parts like the clutch, gears etc. If you cant fix it please call a trained technician, so that damage is minimal.
You may have accidently pushed the LOCK button - this button is used to LOCK the carriage into place when moving the scanner to another location or shipping it.
Check for a button and the picture of a LOCK, it is usually at the back of the scanner, you can push it left or right, and you have an open lock and a closed lock picture under it. Make sure you didn't accidently push it to the LOCK position when holding the scanner - that loud sound means your carriage is locked and cannot move - once you set the button to UNLOCK this should solve your problem.
This is a good fairly high spec unit so I am sorry to say that I think you need to get it to a repairer for a quote for repairs and then to decide if it is cost effective to repair or simply replace the unit. Is it still under Warranty?