Lexmark X 850 Owners Manual
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Repair information4-93 7500-XXX 18.Slide the PC cartridge guide (D) toward the left side, and disconnect the connector from the PC cartridge sensor connector (E). 19.Remove the two hooks securing the transfer roll power contact (F). 20.While pressing the PC cartridge drive coupler (G), lift the front side of the PC cartridge guide (C) upward. 21.Disconnect the connector from the sensor (humidity and temperature) (H). 22.Remove the screw securing the sensor (humidity and temperature) (H) to the PC cartridge guide (C). 23.Remove the sensor (humidity and temperature) (H). Hook Hook C ELeft F Connector G LeftC
4-94MFP Service Manual 7500-XXX Sensor (RFID PC cartridge) and sensor (RFID toner cartridge) removal Note: This removal applies to the sensor (RFID PC cartridge) (A) and the sensor (RFID toner cartridge) (B). 1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 2.Remove the toner cartridge guide assembly. See “Toner cartridge guide assembly removal” on page 4-95. 3.Disconnect the connector from the sensor (RFID PC cartridge) (A) or the sensor (RFID toner cartridge) (B). 4.Release the hooks securing the sensor (RFID PC cartridge) (A) or the sensor (RFID toner cartridge) (B). 5.Remove the sensor (RFID PC cartridge) (A) or sensor (RFID toner cartridge) (B) by sliding it out in the direction of the arrow. Note: the sensor (RFID PC cartridge) (A) and sensor (RFID toner cartridge) (B) require moderate force to remove. FrontA B
Repair information4-95 7500-XXX Toner cartridge guide assembly removal 1.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3. 2.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 3.Remove the PC cartridge. 4.Remove the toner cartridge. 5.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6. 6.Remove the front inner cover. See “Front inner cover removal” on page 4-8. 7.Disconnect the two harnesses from the toner cartridge guide assembly (A), one on the right and one on the left. 8.Remove the harnesses from the clamps. 9.Remove the two screws on the front of the printer securing the toner cartridge guide assembly (A). 10.Open the printer left door assembly. See “Printer left door assembly removal” on page 4-75. 11.Remove the printer left door support strap. See “Printer left door support strap removal” on page 4-74. 12.Remove the screw securing the toner add chute (B) to the frame. PC cartridge Front Toner cartridge
4-96MFP Service Manual 7500-XXX 13.While moving the toner cartridge guide assembly (A) to the left, release the toner add chute (B) from the frame. Remove the toner cartridge guide assembly (C) from the printer. Note: Remove all spilled toner from the printer. Note: Before reinstalling, ensure the shaft on the toner cartridge guide assembly is inserted into the toner add motor assembly (C). Note: Before reinstalling, ensure the shaft (C) on the toner cartridge guide assembly (A) is inserted into the toner add motor assembly (D). A Shaft C FrontB Left Harness clamps Screw
Repair information4-97 7500-XXX Toner add motor assembly removal 1.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3. 2.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 3.Remove the PC cartridge. 4.Remove the toner cartridge. 5.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6. 6.Remove the front inner cover. See “Front inner cover removal” on page 4-8. 7.Remove the toner cartridge guide assembly. See “Toner cartridge guide assembly removal” on page 4-95. 8.Disconnect the connector from the toner add motor assembly (A). 9.Remove the four screws securing the toner add motor assembly (A). 10.Remove the toner add motor assembly (A). Note: Before reinstalling, ensure the shaft on the toner cartridge guide assembly is inserted into the toner add motor assembly (A). A Connector
4-98MFP Service Manual 7500-XXX Fuser cooling fan removal 1.Remove the rear RIP card cover. See “Rear RIP card cover removal” on page 4-13. 2.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11. 3.Disconnect the connector from the fuser cooling fan (A) from the dual drive motor assembly (B). 4.Release the two hooks securing the fuser cooling fan (A) to the fan duct (C). 5.Remove the fuser cooling fan (A). Note: Before reinstalling, the fuser cooling fan (A) must be installed with the center label facing outward. Hooks CA B Rear
Repair information4-99 7500-XXX Printhead assembly removal 1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 2.Open the printer front door assembly. See “Printer front door assembly removal” on page 4-6. 3.Remove the PC cartridge. 4.Remove the toner cartridge. 5.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6. 6.Remove the front inner cover. See “Front inner cover removal” on page 4-8. 7.Remove the toner cartridge guide assembly. See “Toner cartridge guide assembly removal” on page 4-95. 8.Disconnect the three connectors from the printhead assembly (A). 9.Disconnect the connector from the junction harness. 10.Remove the four screws securing the printhead assembly (A). 11.Remove the printhead assembly (A) by lifting it upward. ARear Front Junction harness Connectors
4-100MFP Service Manual 7500-XXX PC cartridge cooling fan duct removal 1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 2.Disconnect the harness from the duct connector. 3.Release the connector harness from the clamp on the PC cartridge cooling fan duct (A). 4.Release the hook securing the PC cartridge cooling fan duct (A) to the toner cartridge guide assembly (B). Hook B A Front AB Front viewHook
Repair information4-101 7500-XXX 5.Move the PC cartridge cooling fan duct (A) in the direction of the arrow while lifting the left side, to release the hook securing it to the toner cartridge guide assembly (B). 6.Remove the PC cartridge cooling fan duct (A). Connector Hooks Front A Connector Holes Clamps ConnectorB
4-102MFP Service Manual 7500-XXX PC cartridge cooling fan removal 1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5. 2.Remove the PC cartridge cooling fan duct. See “PC cartridge cooling fan duct removal” on page 4-100. 3.Disconnect the harness of the PC cartridge cooling fan (A) to the PC cartridge cooling fan duct (B). 4.Release two hooks securing the PC cartridge cooling fan (A) to the PC cartridge cooling fan duct (B). Note: Use care in handling the PC cartridge cooling fan duct hooks, as they easily break. 5.Release the harness of the PC cartridge cooling fan (A) from the slot in the PC cartridge cooling fan duct (B). 6.Remove the PC cartridge cooling fan (A). Note: Before reinstalling the PC cartridge cooling fan (A), ensure the fan blade is facing toward the front of the machine. Connector B Hooks A Front Connector