Error Messages 614 to 617 on an OKI 321DN

[Holly1959]

I`m using an OKI321DN as my network printer for several years without any problems. Now, after a longer phase of nonusing, the printer stucks some papersheets in the fixing-unit, which overheatet and quits its "life". I bought a new one and mounted it. Then I start the printer in maintenance mode to reset the fixing unit counter, which was sucessfully. I start again and now I get the mistake codes 614 to 617 (wrong toner cartridges fixed). This can´t be a correct message because at this time all toner cartridges are original OKI ones. To exclude this possible mistake(s) I bought new ones, however to reduce the costs, refilled no names. After fixing all cartridges I do a restart and the mistake(s) remains with exactly the same codes 614 to 617 (wrong toner cartridges fixed). Has anyone made the same experience and knows a solution to solve the problem(s). Its a good printer and i don`t want trow it away if its possible to do a repair. The OKI support is a disaster and not able to help. The only send an email with local supporters adresses.