Lexmark T620 Service Manual - Page 106

4069-5XX/7XX The elevator tray fails to stop at the correct position and continues to drive into the bottom frame. FRU 1 Lower Limit Switch Lower Limit Switch Cable 2 High Capacity Feeder Control Board Action Check continuity of the lower limit switch. If incorrect, replace the switch. If correct, check the switch cable. If incorrect, replace the cable. If correct, replace the high capacity feeder option control board. Disconnect the lower limit switch cable and check the voltage at J2-1 (orange). The voltage measures approximately +5 V dc. If incorrect, replace the high capacity feeder option control board. The elevator tray down button does not operate. The tray moves to the upper position. Service Tip: Open the high-capacity feeder option front door and check the black rubber bumper attached to the door switch spring. Be sure the rubber button is centered and not touching the sides of the hole or the switch will not function properly. FRU 1 Lower Limit Switch Lower Limit Switch Cable High Capacity Feeder Control Board Action Check the lower limit switch to make sure it is not closed (normally open). If incorrect, replace the switch. Check the lower limit switch cable for a short between pins 1 and 2. If incorrect, replace the cable. If correct, replace the high capacity feeder option control board. 2-78 Service Manual