SOURCE: error c2557 konica minolta 250/NEC IT2530
Reset it, start it with the right door open, go to service mode, clear the counters for drum and developer and go to functions menu. Close the right door and start immediately the F8 function. It should work.
SOURCE: We have Konica Minolta Bizhub 250 What does error
Error code c2557 means "Auto Toner Density Control sensor abnormality" (ATDC)
It is my pleasure to guide you.
Konica Minolta 250 Error C2557 is Toner Density sensor problem
Problem: code C2557 - Abnormally low toner density detected Black TCR Sensor
Sounds like something a technician should take care of. Most of the information I could obtain says that the
Solution: Replaced 4038-R729-00 Hopper Drive Assy (C250 part compatible with C252 )
Good luck and please post back that you are successful, giving thumbs up, or if I can be more helpful.
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