{"id":17301,"date":"2019-10-22T17:19:51","date_gmt":"2019-10-22T17:19:51","guid":{"rendered":"http:\/\/localhost\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=17301"},"modified":"2023-12-18T14:53:09","modified_gmt":"2023-12-18T14:53:09","slug":"c2557-bizhub-c759-c659","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-c759-c659","title":{"rendered":"C2557 (bizhub C759\/C659)"},"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 sub hopper.<\/td><\/tr>
Trouble isolation<\/td>–<\/td><\/tr>
Relevant electrical parts<\/td>-Developing unit\/K
-Toner cartridge\/K
-Toner empty sensor\/K (PZS\/K)
-Toner supply motor\/K (M12)
-Toner cartridge motor \/CK (M14)
-Process drive board (PDB)
-MFP board (MFPB)<\/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 developing unit\/K.<\/a><\/li>
  3. Reinstall toner cartridge\/K.<\/a><\/li>
  4. Check the connector between M12-relay CN258-PDB CN8 for proper connection and correct as necessary.<\/li>
  5. Check the connector between M14-relay CN321-relay CN428-PDB CN7 for proper connection and correct as necessary.<\/li>
  6. Check the connector of M12, M14 for proper drive coupling and correct as necessary.<\/li>
  7. Check the connector between PZS\/K-relay CN248-relay CN265-MFPB CN4E for proper connection and correct as necessary.<\/li>
  8. PZS\/K I\/O check, sensor check