6f5f31d5_Printer_Error_Code_Information__Solutions
[Error Code] Error 929 [Error Message] The toner sensor is not operating properly, the developer drive assembly is not operating properly or the print cartridge is defective. Check Toner Sensor Check Cable Check System Board [Solutions] 
Check developer drive for worn, loose or broken parts. Check the wiring harness cable. Check the operation of the toner sensor.
Lexmark Printer Error Code Information
Solutions