C2556 (bizhub C287/C227)

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Trouble typeC2556: Abnormally high toner density detected yellow TCR sensor
RankB
Trouble detection conditionThe TC ratio of the toner determined by the toner replenishment control is detected to be the predetermined value or over for consecutive times.
Trouble isolation–
Relevant electrical parts-Imaging unit/Y,M,C
-Developing unit/K
-MFP board (MFPB)

 Procedure

  1. Reinstall the imaging unit.
  2. Reinstall the developing unit/K.
  3. Check the connector between the imaging unit or developing unit/K-relay CN161,CN162,CN163,CN164-relay CN15-MFPB CN18E for proper connection and correct as necessary.
  4. Replace the the corresponding imaging unit. (Part# A85Y08D)
  5. Replace MFPB. (Part# A797H02118)

K.3.9.6 (Link to the Field Service Manual)