My printer has just started to deposit black smudges on the backs of the pages. Actual print page is OK but I can't have black marks on the back of every page. I have cleaned it as much as I can - taken out the photoconductor unit and wiped surfaces with tissue, and I have pulled out the cleaning rod as per the manual. This has not worked. Any suggestsions, please.
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check half page test..give print command when it printing half page stop the printer open the door remove the cartridge take out paper see is this quality what you are observed. if yes its needs to clean the laser scanner assm.. if half test page is good then check the fuser assm, might be toner partials deposited on Teflon sleeve..its avail replace teflon sleeve or fuser..
Your problem is the black toner cartridge pickup drum has become scratched and is depositing "extra" black toner onto the paper prior to the fuser roller. you need to replace the drum and all should be ok then
From the symptoms that you described, the problem lies with your imaging unit, specifically the developer blades are blocked with toner deposits. It is a common problem with this printer. It can be fixed by two ways. The first and most expensive is to buy a new imaging unit at your local office supply store for $100+. It will fix it until the toner deposits build up again and starts to fade the output.
Remove the Yellow Drum unit, Check the drum for any toner. The drums should be clean and I believe a Green color. If you see any toner on the yellow unit replace the unit. Some models have a charge cleaner built into the image units, if that is the case with yours you will see a light blue knob on the front of the unit. Pull this knob in and out about 5 times to clean the units charger this may correct the problem without replacing the yellow image unit.
Usually ghosting is caused by the fusing unit, which usually means that it needs replaced to be honest. You could try getting into the fuser and giving the rollers a wipe, they may have dry toner on them which could also cause the fault. but i'd say the fuser could need changed!!!
Hope that helps
Hmm... This sounds like it is a toner problem. If your roller is getting too much toner then it just globs it onto the paper even though the drum is not asking for it. Are you using a new toner cartridge or a re-filled one? Is it from Brother or a 3rd party? I suggest you remove the toner cartridge and check inside the printer. Clean any spilled toner. Check the toner cartridge for leaks .. give it a good shake and see if it is leaking. If you have another toner cartridge, you can replace it to test. You may need to pint a few pages to see a change. Another test could be to print a few (2-5) "BLANK" pages. The printer should not be depositing any toner. If no smudge or the smudge stays the same, then the toner cartridge is the likely problem. If the smudge is there, but gets smaller, then clean your printer.