{"id":25477,"date":"2023-10-02T13:11:35","date_gmt":"2023-10-02T13:11:35","guid":{"rendered":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=25477"},"modified":"2023-12-13T14:32:21","modified_gmt":"2023-12-13T14:32:21","slug":"c2557-bizhub-950i-850i","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-950i-850i","title":{"rendered":"C2557 (bizhub 950i\/850i)"},"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<\/strong><\/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
– Toner cartridge
– Toner empty sensor\/K (PZS\/K)
– Toner supply motor\/K (M12)
– Toner cartridge motor\/K (M14)
– CPU board (CPUB)
– Base board (BASEB)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Procedure<\/h2>\n\n\n\n
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  1. Perform image troubleshooting procedure if image density is low.<\/li>\n\n\n\n
  2. Check the connector between M12-relay CN258-BASEB CN18E for proper connection and correct as necessary.<\/li>\n\n\n\n
  3. Check the connector between M14-relay CN321-relay CN428-BASEB CN19E for proper connection and correct as necessary.<\/li>\n\n\n\n
  4. Check the connector of M12 and M14 for proper drive coupling and correct as necessary.<\/li>\n\n\n\n
  5. Check the connector between PZS\/K-relay and CN253-BASEB CN27E for proper connection and correct as necessary.<\/li>\n\n\n\n
  6. Check CPUB for proper installation and correct as necessary.<\/li>\n\n\n\n
  7. PZS\/K I\/O check, sensor check\n