Lexmark X 850 Owners Manual
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Repair information4-183 7500-XXX Switch (ADF left cover interlock) removal 1.Open the ADF left cover assembly. 2.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166. 3.Remove the screw and washer securing the switch (ADF left cover interlock) (A). 4.Disconnect the two connections to the switch (ADF left cover interlock) (A) with needle nose pliers. 5.Remove the switch (ADF left cover interlock). A Screw Connections Front
4-184MFP Service Manual 7500-XXX Sensor (ADF width APS 1) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Release the hook securing the sensor (ADF width APS 1) (C) to the sensor mount (A). 7.Disconnect the connection from sensor (ADF width APS 1) (C). 8.Remove the sensor (ADF width APS 1) (C). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. AB C A
Repair information4-185 7500-XXX Sensor (ADF width APS 2) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Release the hook securing the sensor (ADF width APS 2) (C) to the sensor mount (A). 7.Disconnect the connection from sensor (ADF width APS 2) (C). 8.Remove the sensor (ADF width APS 2) (C). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. BA A C A
4-186MFP Service Manual 7500-XXX Sensor (ADF width APS 3) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the under of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Release the hook securing the sensor (ADF width APS 3) (C) to the sensor mount (A). 7.Disconnect the connection from sensor (ADF width APS 3) (C). 8.Remove the sensor (ADF width APS 3) (C). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. BA A C
Repair information4-187 7500-XXX Sensor (ADF registration) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Remove the screw securing the ADF registration sensor. 7.Disconnect the connector from the sensor (ADF registration). 8.Remove the sensor (ADF registration) (C). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. BA C A
4-188MFP Service Manual 7500-XXX Sensor (ADF pre-registration) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Release the hooks securing the sensor (ADF pre-registration) (C) to the sensor mount (A). 7.Disconnect the connector from the sensor (ADF pre-registration) (C). 8.Remove the sensor (ADF pre-registration) (C). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. BA A C
Repair information4-189 7500-XXX Sensor (ADF inverter) 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly to its uppermost position. 3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 4.Remove the two screws securing the sensor mount (A) to the ADF. 5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in which the required sensor is easily removed. 6.Release the hooks securing the sensor (ADF inverter) (C) to the sensor mount (A). 7.Disconnect the connector from the sensor (ADF inverter) (C). 8.Remove the sensor (ADF inverter). The APS, pre-registration, and inverter sensors are removed in the same manner. Release the hook, disconnect the connector, and remove the sensor. AC AB
4-190MFP Service Manual 7500-XXX Actuator/media guide assembly removal 1.Open the ADF left cover assembly. 2.Lift the separation roll guide assembly (A) to its uppermost position. 3.Remove the two screws securing the actuator/media guide assembly (B) to the ADF. 4.Remove the actuator/media guide assembly (B). A Rear B
Repair information4-191 7500-XXX Inverter gate removal 1.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 2.Flex the tab, and remove the boss from the hole. 3.Remove the inverter gate (A). ADF registration roll assembly removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Open the ADF left cover assembly. 3.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166. 4.Remove the ADF rear cover. See “ADF rear cover removal” on page 4-165. 5.Remove the document tray assembly. See “Document tray assembly removal” on page 4-164. 6.Remove the ADF media feed assembly. See “ADF media feed assembly removal” on page 4-162. 7.Remove the ADF feed drive motor assembly. See “ADF feed drive motor assembly removal” on page 4-172. 8.Lift the separation roll guide assembly to its uppermost position. 9.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on page 4-190. 10.Remove the two screws securing the sensor mount (A) to the ADF. 11.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it out of the way. 12.Remove the tension spring (C). 13.Loosen the screw securing the tension bracket (D), and loosen the registration secondary drive belt (E) tension. 14.Remove the plastic clip securing the registration roll drive pulley 28T (F). 15.Slide the registration secondary drive belt (E) from the registration roll drive pulley 28T (F). 16.Remove the ADF registration motor. See “ADF registration motor removal” on page 4-201. 17.Remove the registration roll drive pulley 28T (F). 18.Remove the bearing 8 mm (G) securing the ADF registration roll assembly (H) to the rear of the feed assembly. 19.Remove the plastic clip securing the bearing 8 mm (I) of front side. 20.Remove the bearing 8 mm (I) securing the ADF registration roll assembly (H) to the front of the feed assembly. 21.Move the ADF registration roll assembly (H) frontward and upward. 22.Remove the ADF registration roll assembly (H). ATab Boss
4-192MFP Service Manual 7500-XXX Warning: Do not touch the rubber surface of the ADF registration roll assembly (H). Note: Before reinstalling the registration secondary drive belt (E), ensure that it is routed properly. Note: Loosen and then retighten the two screws that set the belt tension after tension spring (C) is attached. Plastic clipIG C E F D Front H Plastic clip A B