Lexmark X644E Service Manual - Page 183

7002-xxx Paper size switch not selecting paper size that is selected FRU 1 Paper size switch High-capacity feeder option control board Action Check for continuity between the common pin (J5-1) and the pin of the paper size selected. Pin Color Paper size J5-1 Black Common lead J5-2 Blue B5 J5-3 Green Executive J5-4 Yellow A4 J5-5 Orange Letter J5-6 Red Legal J5-7 Brown A5 If any position does not measure continuity when selected, replace the paper size switch assembly. If the switch assembly is operating correctly, replace the high-capacity feeder option control board. 24x.xx Paper Jam Check Tray x displays when tray x is empty; tray x does not display FRU 1 High-capacity feeder option control board 2 Elevator top optical sensor cable Elevator top optical sensor Action Check the voltages on the board at J4-1(red) and J4-3 (blue). The voltages measure approximately +5 V dc. If incorrect, disconnect J4 from the board and measure the voltages again. If incorrect, replace the high-capacity feeder option control board. Check the continuity of the sensor cable. If incorrect, replace the cable. If correct, replace the top optical sensor assembly. Tray x Empty displays; tray does not respond to loading paper; no response from the front door switch FRU 1 High-capacity feeder option control board 2 Elevator top optical sensor cable Elevator top optical sensor Action Check the voltage on the board at J4-2 (green). The voltage measures approximately +5 V dc. If incorrect, disconnect the cable at J4 and check the voltage again. If incorrect, replace the high-capacity feeder option control board. Check the continuity of the sensor cable. If incorrect, replace the cable. If correct, replace the top optical sensor assembly. Diagnostic information 2-145