I was called to look at some Sharp ARM 450 copiers. There was one saying "Change Toner Cartridge" so I took out a functioning toner from another Sharp Arm 450 copier and installed it, it said the same thing, "Change toner cartridge", I took out another cartridge from another and another and another machine but it kept on saying change toner cartridge. So I gave up. However, when I returned the good toner cartridges to their respective copiers they then began to say change toner cartridge. So now the machines that were working well are not now working. Therefore, there are two problems that I need help with. What can I do to get the first copier to accept the cartridge and secondly, how can I get these cartriges to work again. Can some one please help. Monham
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