Bizhub 250 error code:c2557

Dec 5, 2018
Hello friends i need a help regarding the error code (C2557) i encountered with the photocopier Bizhub 250. I always get a 10.0 on my sensor gain. I keep on adjucting my ATDC sensor value but still getting 10.0 but nit the normal value of 3-5 to 7. Toner is new, Imaging unit as well as the developer is new. Cleaned the machine for any dirts and clogged pieces of papers.

any other recommendation is highly appreciated. thnk you friends

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