The scanner copies everything with a dark shade. This happens when making copies and when using it as a computer scanner. It does print fine however. Everything was working fine until I took the toner out of another sharp copier 1655cs and put it in this one. this 1641 neeeded toner for some time months and I just borrowed it from the 1655 since it is the same toner. I think that is when the scanning problems started. I put back in old toner and still not working. I tried calling tech support and they ran a bout of codes starting and restarting the copier and said I have to ship it back to them for them to fix it.

Whenever you ask about any problem please explain in detail.There are couple of reasons behind the above mentioned problem.Its not clear that copies are all black (full black) or just dark in print density? or its giving a dark shade? As per asked question, the solution is Check the followings1-Scanner mirrors are dirty2-Drum is damaged or faulty3-Charging corona 4-LD unit5-Developer

Does this happen when you print, or only when you copy? If you print out a configuration or user settings page, or print a page from the computer, is it also missing two vertical lines of print or is it only when you are copying?

If it happens when you print, you may need a cleaning, or you may need to replace the toner or drum cartridge. If it's an inkjet machine, there's a possibility there is some ink or grease on the encoder strip (a small belt-like plastic strip that goes through the print-head carriage).

If it only happens when you copy, test both the flatbed and the document feeder. If it happens on both then you may have a bad scanner. If it only happens when using the document feeder, you likely have some whiteout (or something) on the glass. When you make a copy in the flatbed, the scanner moves across your document. When you make a copy using the document feeder, the document moves across the scanner. In this case, if there is anything on the scanner glass (like whiteout) your copies will be missing a vertical line of print data (it could be white if there is whiteout on the glass, or it could be dark if something dark is on the scanner glass).

Usually you can lift the flatbed cover and look at the glass to see if anything is on it (usually at the left side of the scanner). Clean the glass, first with alcohol to remove the obstruction, and then with a little windex to remove anything the alcohol may have left behind.

replace the toner dear

You must change 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.

It depends... never use a Reman cart in these machines... only use sharp...especially if the machine is under warranty.

Does this happen when,
Using the Doc Feeder
When making copies from the Glass
Or when you print from a computer (assuming you print from a PC)

If you print something and this happens then it is inside the machine
Probably toner or developer dumping...

Take a few pieces of large white paper and cover the entire glass surface... make a copy is the line there? If so see the answer above... if not then close the top and make a copy with no paper on the glass... is that black line there.. If so then your top needs adjustment...

One more test
If you make a copy using the doc feeder, this black line only occurs when making copies with the doc feed, clean the **** glass, and try again...

What you need to do is adjust shading. That recalabrates the scanner. To enter the machine into the tech mode you press " menu, # 1934" then you will be in the tech mode, a T should appear on the machine screen. You then go to machine setup and maintenance, then scroll to adjust shading or just shading, depending on how your specific firmware states it.
Then place 5 sheets of white paper on the glass, 5 pieces of paper think not spread out, then press start, if it askes you DO you want to asjust press start and let it run through the setup.
Once you have cleaned the scanner you really need to adjust teh shading. A better way to say it would be scanner calabration.

Hold down the auto expsoure key the the lights will began to blink light copies then push it again to hold lighter expsoure.

Test page printed properly. Don't know what to look for in the test page or the applications. the cartridge was changed recently

You have a scanner problem.  You might try and make sure you're using the right plug for it.  If you can figure out how to take the glass off, you should try cleaning all the glass and mirrors.  You should also clean the area just above where the scanner rests when it's not being used (you'll see a white strip there).  If none of this works, you'll probably need a new scanner.  Junk the thing.