{"id":20937,"date":"2020-06-29T18:22:04","date_gmt":"2020-06-29T18:22:04","guid":{"rendered":"http:\/\/localhost\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=20937"},"modified":"2023-12-13T18:34:00","modified_gmt":"2023-12-13T18:34:00","slug":"c2551-c2553-c2555-bizhub-c750i","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2551-c2553-c2555-bizhub-c750i","title":{"rendered":"C2551, C2553, C2555 (bizhub C750i)"},"content":{"rendered":"\n

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.<\/strong><\/p>\n\n\n\n

Contents<\/h2>\n\n\n\n
Trouble type<\/td>C2551: Abnormally low toner density detected cyan TCR sensor

C2553: Abnormally low toner density detected magenta TCR sensor

C2555: Abnormally low toner density detected yellow TCR sensor<\/td><\/tr>
Rank<\/td>B<\/td><\/tr>
Trouble detection condition<\/td>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.<\/td><\/tr>
Trouble isolation<\/td>–<\/td><\/tr>
Relevant electrical parts<\/td>-Developing unit\/C,M,Y
-Toner cartridge\/C,M,YPH unit
-Toner empty sensor\/Y (PS34)
-Toner empty sensor\/M (PS33)
-Toner empty sensor\/C (PS32)
-Toner cartridge motor\/YM (M10)
-Toner cartridge motor\/CK (M25)
-Toner supply motor\/Y (M9)
-Toner supply motor\/M (M8)
-Toner supply motor\/C (M7)
-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)<\/td><\/tr><\/tbody><\/table>\n\n\n\n

Procedure<\/h2>\n\n\n\n
  1. Perform image troubleshooting procedure if image density is low.<\/li>
  2. Reinstall the developing unit.<\/li>
  3. Reinstall the toner cartridge.<\/li>
  4. Check the connector between the developing unit\/C-relay CN251-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2551)<\/li>
  5. Check the connector between the developing unit\/M-relay CN250-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2553)<\/li>
  6. Check the connector between the developing unit\/Y-relay CN249-relay CN248-EXCB CN6EX for proper connection and correct as necessary. (C2555)<\/li>
  7. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.<\/li>
  8. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.<\/li>
  9. Check CPUB for proper installation and correct as necessary.<\/li>
  10. M10, M25 operation check