I haven't run into this issue before, so here goes. A Sharp MX-B201D. Just replaced the drum, process unit and developer. Install its used cartridge and the machine doesn't recognize it. I install a new OEM one and I get the same. I cleaned out the contacts and even tried replacing the chip on the new cartridge just in case. It just will not recognize a toner cartridge. Praying it's not the PWB. Any thoughts?
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