Lexmark Optra C710 Service Manual - Page 170

5016-001 E Paper size in tray 1 is not detected. When media in Tray 1 reaches 50 or less sheets, the paper detect lever turns on the paper detect sensor and displays Load Paper Tray 1. FRU 1 Tray 1 Rear Paper Guide 2 Paper Size Detect Plate Paper Size Detect Plate Spring 3 CST Cable Paper Size Detect Sensor Board Engine Board Action Check the rear paper guide in tray 1 for correct installation and signs of damage to the paper size detect flag. If the flag is broken, replace the rear paper guide. Check the paper size detect plate spring for looseness or if it is broken. If broken, reconnect or replace the spring. Check the paper size detect plate for proper operation. If incorrect, repair as necessary. Check the continuity of the CST cable. If incorrect, replace the cable. Check the paper size detect sensor board for correct operation. If incorrect, replace the sensor board. If the CST cable and size detect sensor board are operating correctly, replace the engine board. 2-104 Service Manual