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C2557 (bizhub C754e/C654e)
Contents
| Trouble type | Abnormally low toner density detected black TCR sensor |
| Trouble code | C2557 |
| Rank | B |
| Detection timing | When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper. |
| Trouble isolation | – |
| Relevant electrical parts | • Developing unit /K • Toner cartridge /K • Toner empty sensor/K (PZS/K) • Toner supply motor/K (M12) • Toner cartridge motor /CK (M14) • Printer control board (PRCB) |
(2)Procedure
| Step | Action | Control signal | Location of electrical components |
| 1 | Perform image troubleshooting procedure if image density is low. | – | – |
| 2 | Check the connector between M12-relay CN258-PRCB CN3 for proper connection, and correct as necessary. | – | – |
| 3 | Check the connector between M14-relay CN321-relay CN428-PRCB CN4 for proper connection, and correct as necessary. | – | – |
| 4 | Check the connector of M12 and M14 for proper drive coupling and correct as necessary. | – | – |
| 5 | M12 operation check(At this time, IU must be non-installation.) | PRCB CN3-13 to 16 | 24-C |
| 6 | M14 operation check | PRCB CN4-5 to 8 | 3-K |
| 7 | Replace M12 (Part# A00JM12100) and M14 (Part# 9314130021) | – | – |
| 8 | Reinstall developing unit /K (Part# A2X203D) | – | – |
| 9 | Reinstall toner cartridge (C Part# A3VU430, M Part# A3VU330, Y Part# A3VU230 , K Part# A3VU130) | – | – |
| 10 | If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. | – | – |
| 11 | Replace the developing unit /K (Part# A2X203D) | – | – |
| 12 | PRCB ICP23 or ICP24 conduction check | – | – |
| 13 | Replace PRCB. (Part# A2X0H00S06) | – | – |
- Link to the wiring diagram (N.1. bizhub C754e/C654e)
- Link to the layout drawings for related parts by each trouble code (S.64. C2557)
Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.
K.3.7.16 (Link to the Field Service Manual)