Why c2553 error code in konica minolta c451 what is the problem

Try manually turning the developer drive gear on the Magenta imaging unit (use nose pliers)
_or_
Replace Magenta Imaging Unit.

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Thread Konica Minolta Biz C250 error c2553

Error Codes Konica Minolta bizhub C252 Code C2553

Code: C2553 Code C2553 Description Abnormally low toner density detected Magenta TCR Sensor
• TC ratio in the developing machine, which is determined by Toner replenishing amount control mechanism, is 5 % or less for a given number of times consecutively. Remedy 1 Perform image troubleshooting procedure if image density is low. 2 Clean the TCR Sensor window on the underside of the Imaging Unit if dirty 3 M6, M7 operation check PWB-M CNDM2-10 to 13 (M6) PWB-M CNDM3-10 to 13 (M7) C-20 C-21. 4 Reinstall Imaging Unit. 5 Change Imaging Unit. 6 Change PWB-M. 7 Change PWB-MFP.

Toner hopar and toner senser