Lexmark Optra C710 Service Manual - Page 163

5016-001 Toner Low/Empty Sensor Service Check Note: Check the print darkness menu setting before checking the toner sensor. This service check is intended to be used when a 929 service error displays. FRU 1 Developer Drive Assembly 2 Toner Sensor Cable 3 Toner Sensor Action Incorrect operation of the developer drive assembly can cause the printer to display a 929 error code. Check the developer drive assembly for correct installation, signs of wear, or loose or broken parts. Be sure the toner sensor assembly cable is properly seated into the toner sensor. • If correct at both the sensor and engine board (J10), check the continuity of the cable. • If incorrect, replace the cable. The toner sensor cable is part of the front harness and part of connector J10 on the engine board. Check the voltage at J1-011. It should read approximately + 5 V dc. • If incorrect, replace the engine board. • If correct, check the voltage at J10-12. It should read approximately +5 V dc with the controller board removed from the printer. • If incorrect, replace the engine board. • If correct, replace the toner sensor assembly. A bad ground connection between J10-13 on the engine board and pin 3 on the toner sensor results in a 929 service error. Diagnostic Information 2-97