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Error 993 with Lexmark C710

This error code indicates the cam sensor has not bee activated. The sensor activates when the fuser dirve motor turns the cam disk. If the fuser drive motor does not turn on, or the drive parts are not operating: - Check the fuser assembly internal drive gears for binding, or broken or worn teeth. If a problem exists, repair or replace the fuser assembly. Remove the fuser drive motor from the stay assembly, leaving the motor cable connected to the motor. Turn the printer on, but do not allow the motor to touch other areas of the printer. Verify the motor turns during POR. - Check the motor for shorts between the case and each motor winding. If a short is found, replace the motor. - Check the motor for open windings. If found, replace the motor. - Check continuity of the fuser motor/paper feed motor/carriage unit motor cable. If incorrect, replace the cable, if correct, replace the engine board. - Check the fuser drive gears, gears C3-1, C3-2, the clutch spring, motor drive gear, gear C...