I suspect it's a hardware fault as we sell hundreds of third party tn-243 and 247 cartridges every week so I'd know if it was a firmware issue by now. I plan to spend some time in the workshop today and will contact my colleagues to find out if they have the solution. I have seen this problem a number of times in the last week and have yet to resolve it. Press the Up arrow key to reset the drum counter.Press the Up or Down arrow key to display the toner color for the drum unit you just replaced, and then press OK.
Hold down OK as you press the Up arrow key.Make sure the machine's cover is closed.You can, however, reset the drum counters and get more life out of them - just remember to do this again if you replace them when the image quality begins to deteriorate.
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