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Is the paper a shade of grey with no image? or is there an image with a grey background? If there is a image with a grey background you should try a new toner module. If that doesn't resolve the issue, clean the xerographic drum, make 10 blank copies, if the cleaning doesn't resolve the issue than install a new xerographic module.
Code U4-1 is Over heat or under heat, even if you solve this problem you mentioned that you have a copy from the machine which is Blank, the reason is that the print cartridge is dead, it is not holding charge, and even if you find a new one in a box sealed, I am 99.9 present sure that it is not going to work either, it is an old expired cartridge, basically do not waist your time and money, I serviced these machines and I know.
A common mistake is that people think that the waste toner needs to be emptied and instead the toner needs to be replaced --- and vice versa. Check to make sure that the toner bottle is not empty. Also, if you made copies that took ( used ) more toner then the machine was able to replenish, the machine has not had a chance to catch up. Place a white sheet of paper on the platen glass and make blank white copies. You may only be able to get 1-2 copies at first but as the device catches up with the toner replenish you should be able to make more. The blank copies you make -- do NOT put that paper right back into the machine. Lay it flat and let it cool, this will help prevent unwanted jamming due to heat build up in the paper. IF you have good amount of new toner in the machine, gently tap the front line ( or rear line) that feeds the used toner into the waste bottle. Sometimes the waste toner will clog and back up into the machine giving false 'waste toner full' message.
My printer is constantly getting jammed, spitting out blank sheets of paper in between every printed sheet, clicking and snapping, etc.
There are a few places to check for a jam - pull the paper drawer out and check there, take the toner cartridge out and you'll often find a sheet there that you cannot see from any other angle, open the little compartment at the back and check there and the usual paper sticking out of the output just enough to pull it out the rest of the way.
I'll be looking for a new printer this week though. I can't take the constant paper jams and sifting out the blank sheets when I'm printing 500+ statements a month.
Definitely NOT an office friendly machine!
I believe that the Heat roller in the Fuser has a build up of toner on it(in some areas) and as a result is not fully fusing the toner into the paper. when you use a thick setting you are actually slowing the speed down to allow more heat to the toner. the thicker paper causes more pressure allowing the toner to fuse properly. I would say you need a new Heat roller and possibley a pressure roller. You could try running 20 copies of a blank white page. Sometimes this will help. Poor fusing can also cause a previous image to come up on the next page or repeat itself down the page. A service call is in order if this does not work.
Thanks Guest with Best Solultion! OMG! I have had my machine printing blank for over a month now and reading stuff and trying to find a solution. Until finally today I found this page. I read your solution and hit the front like u said for several times and nothing. Finally, after the third try WALA...IT WORKED!!! Thanks again. If anyone has this same problem try this because it really works! Eventhough this is such a strange problem for such an expensive machine.