{"id":24595,"date":"2021-02-03T19:18:07","date_gmt":"2021-02-03T19:18:07","guid":{"rendered":"http:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=24595"},"modified":"2023-12-13T15:59:31","modified_gmt":"2023-12-13T15:59:31","slug":"c2557-bizhub-4750i-4050i","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-4750i-4050i","title":{"rendered":"C2557 (bizhub 4750i\/4050i)"},"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>C2557: Abnormally low toner density detected black 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 lower than a predetermined value for a predetermined number of times in a row even though there is toner in the toner cartridge.<\/td><\/tr>
Trouble isolation<\/td>–<\/td><\/tr>
Relevant electrical parts<\/td>-Imaging unit\/K
-Toner transport motor (M4)
-Toner supply motor (M5)
-CPU board (CPUB)
-Base board (BASEB)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Procedure<\/h2>\n\n\n\n
  1. Perform image troubleshooting procedure if image density is low.<\/li>
  2. Reinstall the imaging unit.<\/li>
  3. Check the connector between the imaging unit\/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.<\/li>
  4. Check the connector between M4-BASEB CN11E for proper connection and correct as necessary.<\/li>
  5. Check the connector between M5-BASEB CN11E for proper connection and correct as necessary.<\/li>
  6. Check CPUB for proper installation and correct as necessary.<\/li>
  7. M4, M5 operation check