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C2556 (bizhub C754/C654)
Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
Contents
| Trouble type | Abnormally high toner density detected yellow TCR sensor |
| Trouble code | C2556 |
| Rank | B |
| Detection timing | TC ratio in the developing 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 -Imaging unit /M -Imaging unit /Y -Toner cartridge /C -Toner cartridge /M -Toner cartridge /Y -Sub hopper unit -Printer control board (PRCB) |
 (2)Procedure
| Step | Action | Control signal | Location of electrical components |
| 1 | Reinstall toner cartridge | – | – |
| 2 | Reinstall imaging unit | – | – |
| 3 | Replace imaging unit (C Part# A2X20KD, M Part# A2X20ED, Y Part# A2X208D) | – | – |
| 4 | Replace PRCB (Part# A2X0H00102) | – | – |
| 5 | Replace the sub hopper unit (Part# A2X0R71433) | – | – |
- Link to the layout drawings for related parts by each trouble code (S.62. C2414, C2552, C2554, C2556, C2558, C2559, C255A, C255B, C255C, C2651, C4802, C5601, CC153, CEEE3)
K.3.7.15 (Link to the Field Service Manual)