{"id":19415,"date":"2020-02-27T14:13:36","date_gmt":"2020-02-27T14:13:36","guid":{"rendered":"http:\/\/localhost\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=19415"},"modified":"2023-12-18T14:18:05","modified_gmt":"2023-12-18T14:18:05","slug":"c2557-bizhub-c650i-c550i-c450i","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-c650i-c550i-c450i","title":{"rendered":"C2557 (bizhub C650i\/C550i\/C450i)"},"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 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\/K
-Toner cartridge\/K
-PH unit
-Toner empty sensor\/K (PS31)
-Toner cartridge motor\/CK (M25)
-Toner supply motor\/K (M6)
-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\/K.<\/li>
  3. Reinstall the toner cartridge\/K.<\/li>
  4. Check the connector between the developing unit\/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary.<\/li>
  5. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.<\/li>
  6. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.<\/li>
  7. Check CPUB for proper installation and correct as necessary.<\/li>
  8. M25 operation check