Have you cleaned the slit-glass located behind the drum? Its a thin piece of glass that is about the length of a drum assembly. Check that the drum voltages on the drum label have been correctly installed. Perform a AVPC in service mode to set the primary charge value.
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I beliwe I allready answered that question too, a while ago,but anyway...You has to clean plattenglass,optical system and mirrors.How many copies did drum made? If more than 100000 you'll probably got to change it
Do you know when the drum unit was last replaced? How about the last time the optic's were cleaned? You may be able to fix it your self by cleaning the mirrors in the optic's. If you feel brave...... It is easy to do. If so, follow tese simple steps. Turn the copier OFF and unplug it from the wall. Remove the two screws on the right side of the copy bord glass and remove the plate and carefully remove the glass. Once that is done, gently slide the mirrors over to the right a bit. Then take a dry & clean & soft rag and gentle wipe the three mirrors off. Basicly, to get the dust off. Return the copy board glass & plate & plug it back in and turn it "on" and make a copy. It should come out better. If not you may need a new drum unit. Good Luck
meaning light copies? if so the mirrors need to be cleaned also, the innner optics/blanking assy, and the **** dustproof glass...still problem? check you r drum age and the number of copies if it is more then 5 years old and over 35-40 thousand copies i would replace it...
You could clean the mirrors under the glass, however, those mirrors are hard to get to. The most likely problem is coming from the drum. The drum is either bad or the drum blade is bad. Canon does not make the drum blade anymore and most dealers don't carry the drum because the machine is worth about $10. Maybe you could find one online. Good luck.
First of all did you clean the optic? How about did you replace all of the corona wires? Also, did you clean the scanning lamp as well? Also when you had fitted the new drum, did you use a brand new one or a different one, did you clean the drum with rubbing alc. If all that was done, do a "AE" adjustment in service mode using white paper on the copy board glass. Also, go to the addictional funcation mode and go to expossure adjustment and make it lighter. Or as a last effort adjust the corona hieghts of the primary corona wires. Good Luck...
Your problem is most likely caused by dirty optics. Place a sheet of paper on the glass & make 1 copy with the lid up. Look under the glass at the mirrors on the scanner & see if there is any dust on them. If so,turn the copier off & unplug it from the wall, remove the glass & wipe off the mirrors with a DRY cotton rag. There are 3 mirrors on the scanner assy. There is also three mirrors under the lens cover that should also be cleaned. After cleaning the optics, make a test copy.If your copies are still to dark, press the additional functions key & select exposure adjustment. You can lighten/darken all copies by changing this setting. If you have any problems or questions my email is email@example.com