How do I remove and clean the scanner on a Xerox M20i?

Go to Xerox.com and under drivers and downloads for the M20i , download firmware version 3.02.
And follow the instructions to put the new software onto your printer.

LSU stands for Laser Scanner Unit. It comes up only if you are trying to access scanner services like scanning a document, using fax or simple scanning.

If it's coming continuously you might need to check connectors within the scanner. Best way is to call a technician from Xerox or take it to their store.

try to unzipp the scanner and try to clean the mirror of the scanner.

You have to disassembly and clean scanner as well as document glass from other side

1. Remove the Document Feeder
2. Remove the Doc Scanner
3. Find the hooks on the Doc Scanner to the right and left to separate the glass frame from the plastic scanner housing.

That should give you access. Best of luck.

Whit
Item, Inc.

You will need to do a couple of things, 1 remove, disassemble the scanner and thoroughly clean it, and while you have the scanner out, remove and clean the laser.
The toner cartridge may also be defective. that metering blade in that cartridge fails and causes light images also.
If you need instructions on how to remove and clean the scanner and laser let me know, I will type them out to you.
Not hard, just time consuming.
If you print out a report how does that look? If prints look fine and just the copies are light, then the mirrors in the scanner head a re probably fogged up. All the plastic in that scanner causes that same film on your scanner optics as you develop on your car windshield. Same process.

Since you cleand the scanner and scans are fine, the other item I seen cause that problem is the power supply.

You need to clean the scanner. You can try doing the shading adjustment to calabrate the scanner but most likely the mirrors are hazed up. Since you can print fine you eliminate the laser.
To do the shading adjustment, you need to press in order,,, Menu # 1934, You will see a " T "on the screen, that will be the tech mode. Press the machine status, then go to maintenance, then scroll to shading. Place 5 sheets of white paper on the glass and then run the shading adjustment. turn the machine off and on, and run copies again. But most likely you will have to take the scanner off and clean it.
If you want to clean the scanner let me know, I will send you directions on how to do that. The mirrors in that scan head tend to haze up.

You can only do scanning on an M20i with a USB or parallel cable. That machine does not support scanning via an ethernet cable.

Sounds like a dirty seal glass. Clean the glass on the left side of the scanner. The 1/2 inch strip of glass.