Lexmark X 850 Owners Manual
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Repair information4-163 7500-XXX Note: When replacing the complete ADF media feed assembly, first remove the ADF left cover assembly and the ADF registration motor from the replacement part. P758P786P755 P785 P761P754 A Clamp B Set screw Connectors D F ConnectorsP758P786P755 P785 P761P754 A Clamp G B E Connectors D F Clamps Front Rear
4-164MFP Service Manual 7500-XXX Document tray assembly removal 1.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166. 2.Remove the ADF rear cover. See “ADF rear cover removal” on page 4-165. 3.Open the ADF left cover assembly. 4.Release the wire clamp (A) that binds the harnesses together. 5.Disconnect the two connectors P759 and P760 from the ADF controller card assembly (B). 6.Remove the screw securing the green ground wire (C). 7.Remove the screw securing the document tray hinge (D). 8.Remove the document tray hinge (D). 9.Move the document tray assembly (E) upward to detach it from the ADF. 10.Remove the document tray assembly (E). 11.Remove the harness from the round opening in the ADF. Note: Before reinstalling the document tray assembly, ensure all connections are properly reconnected. Note: Ensure the green ground wire (C) is reconnected. D EC A BFront Connectors
Repair information4-165 7500-XXX ADF rear cover removal 1.Open the ADF left cover assembly. 2.Lift the document tray assembly. 3.Remove the three screws securing the ADF rear cover (A). 4.Lift the ADF rear cover (A) upward. 5.Remove the ADF rear cover (A). A Rear
4-166MFP Service Manual 7500-XXX ADF front cover assembly removal 1.Open the ADF left cover assembly. 2.Remove the screw securing the ADF front cover assembly (A). 3.Lift the ADF front cover (A) upward. 4.Remove the ADF left cover assembly (A). A Front
Repair information4-167 7500-XXX ADF controller card assembly removal 1.Remove the ADF rear cover. See “ADF rear cover removal” on page 4-165. 2.Disconnect all connectors from the ADF controller card assembly (A). 3.Remove the five screws securing the ADF controller card assembly (A). 4.Remove the ADF controller card assembly (A). Note: Ensure that all connections are properly reconnected. Note: Ensure that the ground wire is reconnected. P760P759P758 P785 P761 P751P752P753P754 P755 P786 P756 P757 A Rear Ground wire
4-168MFP Service Manual 7500-XXX ADF left cover assembly 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 ADF rear cover. See “ADF rear cover removal” on page 4-165. 4.Remove the ADF left cover media guide. See “ADF left cover media guide removal” on page 4-181. 5.Remove the screw securing the harness retainer (A). 6.Remove the harness retainer (A). 7.Remove the screw securing the left cover hinge retainer (B). 8.Remove the left cover hinge retainer (B). 9.Remove the screw securing the front hinge pin (C). 10.Remove the front hinge pin (C). 11.While holding the ADF left cover assembly, remove the rear hinge pin with needle nose pliers (D), and remove the ADF left cover assembly (E) from the ADF. Warning: Do not allow the ADF left cover assembly (E) to hang by the harness, or damage will occur. 12.Remove the left cover pinch roll assembly. See “Left cover pinch roll assembly removal” on page 4-171. 13.Disconnect the connector from the sensor (pick roll position HP) (F) located on the ADF left cover assembly (E). 14.Remove the screw from the green ground wire (G). 15.Remove the screw securing the grounding plate (H). 16.Remove the grounding plate (H). 17.Remove the two screws securing the harness guide (I). 18.Detach the harness guide (I). 19.Disconnect the connector from the pick roll position motor assembly (J).
Repair information4-169 7500-XXX 20.Remove the harness from the rectangular opening of the side of the ADF left cover assembly. Note: Before reinstalling the ADF left cover assembly (E), ensure that the harness is properly routed and is not pinched. Note: Ensure that the harnesses are properly captured by the harness guide (I). Note: Ensure that the green ground wire (G) and the grounding plate (H) is reconnected. Note: Ensure that the ADF left cover assembly (E) opens and closes without binding. Note: Ensure that the spring (K) attached to the feed/pick roll assembly (L) is properly reinstalled. A B E C D Front Rear Left side
4-170MFP Service Manual 7500-XXX J IE Connector G Connector F K L H
Repair information4-171 7500-XXX Left cover pinch roll assembly removal 1.Open the ADF left cover assembly. 2.Disconnect the connector from the sensor (pick roll position HP) (A). 3.Remove the three screws securing the left cover pinch roll assembly (B). 4.Remove the left cover pinch roll assembly (A). A Front B Connector
4-172MFP Service Manual 7500-XXX ADF feed drive motor assembly removal 1.Open the ADF left cover assembly. 2.Lift the document tray assembly. 3.Remove the ADF rear cover. See “ADF rear cover removal” on page 4-165. 4.Remove the ADF registration motor. See “ADF registration motor removal” on page 4-201. 5.Disconnect the three connectors from the ADF dual drive motor assembly (A). 6.Remove the screw securing the harness guide (B) to the ADF. 7.Remove the two screws securing the ADF dual drive motor assembly (A) to the base of the ADF. 8.Remove the two screws securing the ADF dual drive motor assembly (A) to the rear of the ADF. 9.Remove the stud screw securing the ADF dual drive motor assembly (A) to the rear of the ADF. 10.Remove the plastic support (C). 11.Remove the connectors P751, P754, P755, P758, P761, P785 and P786 from the ADF controller card assembly (D). 12.Remove the harness guide (B) containing the harnesses and swing it out of the way. 13.Remove the ADF dual drive motor assembly (A) from the ADF. P760P759P758 P785 P761 P751P752P753P754 P755 P786 P756 P757 A D A C B ConnectorsStud screw