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I found your error code and suggested remedies here: Error Codes Konica Minolta bizhub 250 Code C2557
This site is very useful as by changing the drop down menus along the top of the page you can view other errors for your machine and for other models and makes. You can also use the link to get a pdf format Service Manual for your machine.
Hope this is helpful, if so would you please register that with Fixya
C2557: Abnormally low toner density detected black TCR sensor.
Detailed Error code explained below.
* Open and close the front toner door.
* Restart the machine by turning off the LCD screen power switch, then by the main body switch located behind the access panel above tray 1 indicator light.
* Call Konica to get a tech out.
C2557 Abnormally low toner
density detected black
• When sampling data is determined in TC
ratio calculation control, TCR sensor output
is higher than a predetermined value for a
predetermined number of times in a row
even though there is toner in the sub hopper.
Error c2557 means ATDC sensor abnormality.Most probably the developer is very low or weak in such condition.Check the developer.You can also increase ATDC GAIN in technical representative mode in order to get rid of this problem. Also check the PC life/consumables life in "Counter"---"Special Parts life counter".Check if the life of PC Drum is 100% or near to 100 ten clear its value by pressing "C" button.Clear all counters to zero value.Now restart the machine and run F8.It will run smoothly.If you are replacing new developer then there would be no problem with it.
the bizhub 222 typically does not not throw this error code this is an error code is for one of the older konicas and is a toner density error code check developer/ developer unit if this is a bizhub 222 the toner density error code would be c2557