Been working on this mp-c2500 that wont show that there is a toner cartridge in it and wont add toner even if I do a force toner. Then I get this sc-681 code RFID problem. So I replaced the RFID board with a known good one and it wont go away. I have tried 3 different toners still same problem. I have replaced toner pump and dv unit twice also the toner sensor and nozzle unit. I had to change machine out so customer is up and running but need to still fix this problem if for no other reason then its killing me not to know. Please help if you have had this problem . Thanx Kevin
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