Dear all, Last time also i posted same error, i got some solution but no use, the error C2557 coming again, and the TCR value for Cyan is 4 and Black for 3.5, please help me. My advance Thanks
C-2557 Abnormally low toner density detected black TCR sensor.The TC ratio in the developing machine wich is determined by toner replenishing amount control mechanism is 5% or less for a given number of times consecutively.
Relevant electrical parts:imaging unit K,toner supply motor C/K ,mechanical control board or MFP control board.
Perform image troubleshooting procedure if image density is low.
Clean the TCR sensor window on the underside of the imaging unit if dirty.
Check the toner supply motor operation.
Remove and reinstall imaging unit K. or change the imaging unit.
Last solution turn ON the copier open the front door ,enter in service mode,select sistem1 or 2 ,select IuU Unit,select Unit K ,select new release press start and after job is completed close the front door,turn OFF the power,wait 2 minutes and turn ON.
SOURCE: b420 konica minolta
Check the following , Dirt of IDC sensor, Clean up the IDC sensor, if no then Printer control board abnormality Replace board
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