I have a black streak about an inch or so across every page I copy. Tried a new cartridge. Can I assume there's something somewhere that I havent cleaned? Any clues would be appreicated, especially since the nearest service center is a 5 hour round trip drive from here.
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Re: PC940 dark lines across the middle of the page
Either the Fuser/Heating unit is bad, or the optics are dirty.
What you can try to do to narrow it down, is to make a copy but.. STOP the machine in mid process by turning the power off. This will create a paper jam in the machine. If timed properly, your copy should be 1/2 way through the machine with some image on it. (Make sure that you are trying to copy something on the glass). The copy is not FUSED, so the toner will wipe off so be careful not to rub the page against your clothes/sleeve. IF the black line is on the page at this point, the problem is not in the fuser but probably in the fiber optics. If the problem is in the optics and will need to be cleaned. If the black line is NOT on the page at this point, then the fuser unit is bad and needs to be replaced.
Let me know how the copy comes out when you stop the machine in midway and I can see if i can give you any more suggestions. Good luck.
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you need to clean the rollers. consult the manual about cleaning the copier. if you don't have a manual, then get some methyl alcohol (any alcohol that evaporates completely will do). use a lint free cloth to rub a small amount of alcohol on all roller surfaces (accessible via pull-down compartments on front and back, usually).
Most often on the PC940 this means your toner cartridge is getting low on toner. To prove this is the cause, just remove the toner cartridge and while keeping it relatively level, shake it side to side a few times. This will re-distribute the remaining toner in the cartridge. Re-install and make a copy. The black streak/faded copy should be much better. If so then I would go ahead and get a new cartridge on the way.
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Does this happen both when copying and printing? For printing solution, try another toner cartridge. If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.
Replace the Drum Unit, Do you know how to rebuilt this unit, if not you can get an after market product, The Drum unit release is in the Middle of the Copiers you will see a door , open the door, then ONLY , and i do mean ONLY, touch the "Green" release lever for the drum take it out and replace it or rebuilt it f you now how, if this does solve it, which i am certain it will but, if it doesn't something is wrong with the fusing unit and needs to be dismantled, wish i could give you our contact info however, been informed not too so sorry. rules of fixya.com
Whats the make and model of the copier?
One culprit might be the drum. If you can take a look at the drum from your copier and you see black lines on it. It could be scratches on the drum or it may need a new cleaning blade to clean the toner off the drum.