{"id":12721,"date":"2019-07-22T13:15:29","date_gmt":"2019-07-22T13:15:29","guid":{"rendered":"http:\/\/localhost\/bizhubtroubleshooter\/?post_type=epkb_post_type_1&p=12721"},"modified":"2023-12-21T14:21:31","modified_gmt":"2023-12-21T14:21:31","slug":"c2557-bizhub-754e-654e","status":"publish","type":"epkb_post_type_1","link":"https:\/\/apps.kmbizhubvcare.com\/bizhubtroubleshooter\/?epkb_post_type_1=c2557-bizhub-754e-654e","title":{"rendered":"C2557 (bizhub 754e\/654e)"},"content":{"rendered":"\n

\n\nContents<\/p>\n\n\n\n
Trouble type<\/td>Abnormally low toner density detected black TCR sensor<\/td><\/tr>
Trouble code<\/td>C2557<\/td><\/tr>
Rank<\/td>B<\/td><\/tr>
Detection timing<\/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 (PZS\/K)
\u2022 Toner supply motor\/K (M12)
\u2022 Toner cartridge motor \/CK (M14)
\u2022 Printer control board (PRCB)<\/td><\/tr><\/tbody><\/table>\n\n\n\n

 (2)Procedure<\/p>\n\n\n\n
Step<\/td>Action<\/td>Control signal<\/td>Location of electrical components<\/td><\/tr><\/thead>
1<\/td>Perform image troubleshooting procedure if image density is low.<\/td>–<\/td>–<\/td><\/tr>
2<\/td>Check the connector between M12-relay CN258-PRCB CN3 for proper connection, and correct as necessary.<\/td>–<\/td>–<\/td><\/tr>
3<\/td>Check the connector between M14-relay CN321-relay CN428-PRCB CN4 for proper connection, and correct as necessary.<\/td>–<\/td>–<\/td><\/tr>
4<\/td>Check the connector of M12 and M14 for proper drive coupling and correct as necessary.<\/td>–<\/td>–<\/td><\/tr>
5<\/td>M12 operation check(At this time, developing\/drum unit must be non-installation.)<\/td>PRCB CN3-1 to 4<\/td>23-C<\/td><\/tr>
6<\/td>M14 operation check<\/td>PRCB CN4-1 to 4<\/td>3-K<\/td><\/tr>
7<\/td>Replace M12 and M14<\/td>–<\/td>–<\/td><\/tr>
8<\/td>Reinstall developing unit<\/a><\/td>–<\/td>–<\/td><\/tr>
9<\/td>Reinstall toner cartridge<\/a><\/td>–<\/td>–<\/td><\/tr>
10<\/td>If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.<\/td>–<\/td>–<\/td><\/tr>
11<\/td>Replace the developing unit<\/a> (Part# A2X203D)<\/td>–<\/td>–<\/td><\/tr>
12<\/td>PRCB ICP23 or ICP24 conduction check<\/td>–<\/td>–<\/td><\/tr>
13<\/td>Replace PRCB.<\/a> (Part# A55VH00105)<\/td>–<\/td>–<\/td><\/tr><\/tbody><\/table>\n\n\n\n