{"id":5471,"date":"2019-06-10T19:35:05","date_gmt":"2019-06-10T19:35:05","guid":{"rendered":"http:\/\/localhost\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=5471"},"modified":"2023-12-21T18:10:11","modified_gmt":"2023-12-21T18:10:11","slug":"c2557-bizhub-558-458","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-558-458","title":{"rendered":"C2557 (bizhub 558\/458)"},"content":{"rendered":"\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>\u2022 Developing unit
\u2022 Toner cartridge
\u2022 Toner empty sensor\/K (PS31)
\u2022 Toner cartridge motor\/K (M25)
\u2022 Toner supply motor\/K (M6)
\u2022 Expansion control board (EXCB)
\u2022 Front side board (FRB)
\u2022 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 the developing unit.<\/li>
  3. Reinstall the toner cartridge.<\/li>
  4. Check the connector between the developing unit-FRB CN13 for proper connection and correct as necessary.<\/li>
  5. Check the connector between FRB CN1, CN3-MFPB CN4E, CN5E for proper connection and correct as necessary.<\/li>
  6. M25 operation check