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C2557 (bizhub C554/C454)
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Contents
| Trouble type | Abnormally low toner density detected black TCR sensor |
| Trouble code | C2557: Abnormally low toner density detected black TCR sensor |
| 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/C,M,Y,K -Toner cartridge/ C,M,Y,K -Toner empty switch/Y (PS34) -Toner empty switch/M (PS33) -Toner empty switch/C (PS32) -Toner empty switch/K (PS31) -Toner bottle motor (M10) -Toner supply motor/Y (M9) -Toner supply motor/M (M8) -Toner supply motor/C (M7) -Toner supply motor/K (M6) -Front side board (FRB) -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 | Reinstall developing unit | – | – |
| 3 | Reinstall toner cartridge | – | – |
| 4 | Check the connector between developing unit-FRB CN13, CN14, CN15, CN16 for proper connection and correct as necessary. | – | – |
| 5 | Check the connector between FRB CN1, CN3-PRCB CN7, CN9 for proper connection and correct as necessary. | – | – |
| 6 | M10 operation check | PRCB CN14-13 to 16 | 18-C |
| 7 | M6, M7. M8, M9 operation check | PRCB CN14-13 to 16 (M6)PRCB CN14-9 to 12 (M7)PRCB CN14-5 to 8 (M8)PRCB CN14-1 to 4 (M9) | 17 to 18-C |
| 8 | If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. | – | – |
| 9 | Replace the developing unit (Part# A2XN03D) | – | – |
| 10 | Replace FRB (Part# A161H00501) | – | – |
| 11 | PRCB ICP21, ICP40, ICP41, ICP44, ICP46 conduction check | – | – |
| 12 | Replace PRCB (C554 Part# A2XKH00104 / C454 A4FJH00104) | – | – |
- Link to the wiring diagram (N.1. bizhub C554/C454)
- Link to the layout drawings for related parts by each trouble code (S.65. C2551)
- Link to the layout drawings for related parts by each trouble code (S.66. C2553)
- Link to the layout drawings for related parts by each trouble code (S.67. C2555)
- Link to the layout drawings for related parts by each trouble code (S.68. C2557)
K3.7.7 (Link to the Field Service Manual)