C2556 (bizhub C4050i/C3350i)

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Trouble typeC2556: Abnormally high toner density detected yellow TCR sensor
RankB
Trouble detection conditionTC ratio in the imaging unit, which is determined by toner replenishing amount control mechanism, is a predetermined value or more for a given number of times consecutively.
Trouble isolation–
Relevant electrical parts• Imaging unit/C,M,Y,K 
• CPU board (CPUB) 
• Base board (BASEB)

Procedure

  1. Reinstall the imaging unit.
  2. Check the connector between the imaging unit/Y-relay CN7-EXCB CN14E for proper connection and correct as necessary. (C2556)
  3. Check CPUB for proper installation and correct as necessary.
  4. Replace the corresponding imaging unit.
  5. Replace CPUB. (Part# A93EH01004)
  6. Replace BASEB. (Part# A93EH02007)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

L.3.7.6 (Link to the Field Service Manual)