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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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