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please clean the scanning glass and also the feeder.
Open the machine check if any paper has struck anywhere inside.
In most of issues it will work, if this does not works call your technician to troubleshoot the problem
THe main problems are toner spill form drom/dev units ..the transfer on the right hand door will have to be emptied every few months. the paper tray paper stops need to be checked as they come out of place and cause paper jams if not set in place..cahrge rollers can be troublesome if not cleaned every coulple of months and may cause dirty image at the sides or lines on copies..dust on laser **** glass can cause faint on sides of copies.. the fuser stripper fingers tat guide the paper need to be checked for toner under the points to stop paper jams in fuser and the lower guide plate entrance to the fuser needs to be cleaned off every now and then to stop crinklin of paper...apart from that good machine
First place an original on glass and make a copy -- mark #1. With that same original on the glass, move the exposure all the way light and make a copy -- mark #2. Again with the same original on the glass, move the exposure all the way dark and make a copy --- mark #3. Place #1 in the middle so the the copies read --- #2, #1, #3. The #2 should be the lightest and #3 being the darkest. If #2 is darker than #3 you have a developer problem and you need to call for service. If #1 and #2 are bad and #3 is a good copy your machine probably just needs a good cleaning, mainly the optics and charge units. If all 3 copies are still poor with the speckles, your are looking at the PCU ( photo conductive unit) also called the drum unit. You can order this unit online -- it is a customer replaceable item.
I beleive you are not able to make a color copy, once try to scan from the computer or all-in-one to check whether the scanner mechanism is working properly or not, if the scan comes out fine then remove the color cartridge and clean the copper contacts of the cartridge with soft cotton cloth and also check the ink level of the cartridge, if the issue persists replace the color cartridge and if even the scan does not comes out good then there is an issue with the scanner mechanism.