I have a Konica C250 machine which cannot print red color at all. I had changed the toner and image unit but still cannot print red color. How can I solve this problem?

Code

C2555
Description

Abnormally low toner density detected Yellow 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

0 Open and then close the front door.
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.

Konica Minolta BizHub C252 Repair Questions,... - Fixya

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Warming up means that the copier is not getting hot enough in fuser section, Secondly during that time certain internal house chores are done by the copier to prepare it for READY TO COPY. Are all the image units and toner cartridge OEM!!!??? second has each image unit and toner properly shaking ensure toner in toner cartridges and developer in the image units is spread evenly across each pull each out. shake side ways to ensure spread evenly, last time toner full was run nd gradation adjustments run ?

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Replace the Magenta image unit.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Replace the YELLOW image unit not toner

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

P-21: Color regist test pattern failure




1 Wipe clean the surface of the transfer belt with a soft cloth, if it is dirty.
2 Change the image transfer belt unit if the transfer belt is damaged.
3 Change the PH unit.
4 Change PRCB.

run halftone prints from service mode to isolate which color is having an issue.

check all image units

P-21: Color regist test pattern failure




1 Wipe clean the surface of the transfer belt with a soft cloth, if it is dirty.
2 Change the image transfer belt unit if the transfer belt is damaged.
3 Change the PH unit.
4 Change PRCB.

run halftone prints from service mode to isolate which color is having an issue.

check all image units

replace the color image units with OEM cartridges

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Yes, you need to re- chip/fuse the units.

Those codes are related to an abnormal toner to carrier ratio. If you are getting multiple errors that could be a control board failure. I will consult Konica Minolta Solutions and post futher as the information becomes available.