Question about Sharp AR-275 Copier

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My ar275 copier has a problem with the developer unit. the developer leaks out when the machine is working. what is the remedy

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The corona in the drum unit might be dirty which causes an arc that pulls the developer out, Take drum unit out and there are 2 black tabs with a screw in them, Remove the two screws and remove the corona and clean. Be very carefull not to scratch or touch the drum.

Posted on Sep 10, 2010


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With that machine the toner cartridge also contains developer. Without getting too in depth, it sounds like maybe your toner cartridge is leaking a bit of developer which takes with it a bit of toner. Developer is made up of tiny metal particles which are supposed to stay inside the developer unit. As the seals wear in the developer unit (which is part of the cartridge) it allows a little to leak out causing the problems you are seeing.
When you take the toner cart. out, at the rear side (part that goes the furthest into the machine) you'll see a white foam seal. If you notice some excess toner (and probably developer) sticking straight out from that, it could be that the seal has a jagged edge which is dragging developer off of the magnetic roller and depositing it on the drum making the line you speak of on the left hand side.
Also check to make sure the copier is sitting level, if it's not then the concentration of toner at one end of the developer unit is too great and some can be allowed to spill out.

So in short, it's probably not the drum that's at fault, it's more likely the toner cartridge.

Is it worth replacing? There's no easy way to answer that. If the machine is used in a fairly high volume workplace, it's probably worth replacing. If you could get by with a smaller cheaper machine (brother, HP, lexmark etc.) that does printing, scanning, faxing and copying you may be better off.

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Hello Gus,
IF the Toner/developer is spilling out towards the rear of the machine then the developer unit is going bad. A common problem with this model was the rear bushings in the developer unit would wear out and start to leak. If you take the developer unit out of the machine, put down some newspaper, and tip the developer unit (OVER THE PAPER) about 15-20 degrees towards the back and see if the Developer/toner leaks out any. If it does then you found the problem.
If it doesn't then you might just have an over toning problem. To check to see if you have an over toning problem, please the developer unit ON THE PAPER, get a philips screw driver, and put it in the rear White gear. You will see a series of gears but there is only 1 that is the located on the END of the Roller with the toner/developer on it. TURN IT CLOCKWISE about 1 turn and see if you see toner spilling out.
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