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Sharp 7900 black copies and low developer

First the copier started making more and more totally black copies, and the low devloper warning light was on. Toner had spilled inside the copier. I cleaned and vacuumed all of the excess toner.

Is developer and toner the same thing? There are separate warning lights for each. I have puechased a new toner cartirdge and a bag of developer. I know how to install the toner cartridge. What do I do with the developer?

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  • peter kraft May 11, 2010

    sf-7900 right?
    totally black or just very dark?
    totally black should be a bad copy lamp/temp fuse problem.
    does it light up when you copy?


  • jpd8 May 11, 2010

    ..?.. why did you buy the dev. material? Did some one tell you to replace? You will have to take out dev. unit, take apart, clean and vac. dev. unit, install new dev. matr., install dev. unit into machine and then intil. the dev.unit/ material. IS this something you can do?

    If toner or dev. material in spilling into machine you may have to replace seals and/or bushings as well.


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The problem is the drum blade is going bad.This machine is about 15 years old not worth the time or money plus alot of parts are no more.

Posted on Feb 01, 2009

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