Lexmark X 850 Owners Manual
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Repair information4-53 7500-XXX Feed unit drive gear 27 tooth removal 1.Remove the media feed unit assembly. See “Media feed unit assembly 1 removal” on page 4-20 or “Media feed unit assembly 2 removal” on page 4-23. 2.Remove the harness from the bracket (A). 3.Remove the three screws securing the bracket (A) to the media feed unit assembly. 4.Remove the bracket (A). Note: The gears may become detached from the bracket (A). 5.Remove the hook securing the feed unit drive gear 27 tooth (B) to the shaft (C). 6.Remove the feed unit drive gear 27 tooth (B). Note: Before reinstalling, ensure all gears and washers are securely attached to the bracket (A). Harness Clamp A RearHook BC Washer
4-54MFP Service Manual 7500-XXX MPF feed unit assembly removal 1.Remove the MPF rear cover. “MPF rear cover removal” on page 4-58. 2.Disconnect the connector. 3.Release the harness from the clamp. 4.Remove the two screws securing the MPF feed unit assembly (A). 5.Remove the MPF feed unit assembly (A). Note: Before reinstalling, place the harness along the slot on the left of the MPF feed unit assembly (A) so it does not pinch the harness between the feed unit. A Left Clamp
Repair information4-55 7500-XXX MPF media out actuator and upper frame removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. “MPF feed unit assembly removal” on page 4-54. 3.Remove the two hooks securing the upper frame (A). 4.Remove the upper frame (A) by moving it up and out in the direction of the arrow. 5.Remove the MPF media out actuator (B) by prying it outward with a flat tip screwdriver, then slide it out in the direction of the arrow. Hook Hook (Upper frame) Slot B RightA
4-56MFP Service Manual 7500-XXX Sensor (MPF media out) removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the two hooks securing the upper frame (A) to the MPF feed unit assembly. 4.Remove the upper frame (A) by moving it up and out in the direction of the arrow. 5.Disconnect the connector from the sensor (MPF media out) (B). 6.Release the hooks securing the sensor (MPF media out) (B) in the upper frame (A). 7.Remove the sensor (MPF media out) (B). Hook A Connector Hook (Upper frame) RightSlot B
Repair information4-57 7500-XXX MPF transport pinch roll assembly removal 1.Remove the MPF rear cover. Go to “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the two end screws securing the upper bracket (A) to the MPF feed unit assembly. 4.Remove the upper bracket (A). 5.Remove the one center screw securing the MPF transport pinch roll assembly (B) to the upper bracket (A). 6.Release the bosses securing the MPF transport pinch roll assembly (B) to the upper bracket. 7.Remove the MPF transport pinch roll assembly (B) by moving it in the direction of the arrow. Note: Do not touch the plastic surface of the MPF pinch roll. Note: Bushings and springs may become detached. Note: Before reinstalling, ensure you do not touch the plastic roll surface. BossBoss B A Left
4-58MFP Service Manual 7500-XXX MPF rear cover removal 1.Remove the one screw securing the MPF rear cover (A). 2.Remove the MPF rear cover (A). Connector Rear A
Repair information4-59 7500-XXX MPF feed drive gear group removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the pickup spring (A) from the idler gear bracket assembly (B). Note: Leave the pickup spring (A) attached to the MPF feed drive gear pickup (C). 4.Remove the three screws securing the idler gear bracket assembly (B) to the MPF feed unit assembly. 5.Remove the idler gear bracket assembly (B). 6.Release the hooks securing the MPF feed drive gear pickup (C) to the shaft. 7.Remove the MPF feed drive gear pickup and pickup spring (A and C). Warning: Depress the pick solenoid lever (F) and the pick lever (G) while performing step 8, or damage may occur. 8.Remove the small spring (D) from the drive cam gear (E). 9.Remove the drive gear cam (E) and the drive stopper (H). Warning: Before reinstalling, depress the pick solenoid lever and the pick lever while replacing the drive gear cam (E) and the drive stopper (H), or damage may occur. F G B C AE D H
4-60MFP Service Manual 7500-XXX MPF pressure pad removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the MPF pick roll. See “MPF pick roll removal” on page 4-64. 4.Remove the MPF feed shaft assembly. See “MPF feed shaft assembly removal” on page 4-63. 5.Remove the two springs (A) under the pressure pad (B). 6.Turn the MPF upside down, and pry the shaft out with a flat blade screwdriver. 7.Remove the separation pad (B) and the shaft (C) by moving it in the direction of the arrow from the backside. Note: Before reinstalling, ensure the two springs (A) remain in the proper position during reassembly of the feed shaft assembly and MPF feed roll. A B C C Front Botton RearA
Repair information4-61 7500-XXX MPF transport roll assembly removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the two end screws securing the upper bracket to the MPF feed unit assembly. 4.Remove the upper bracket. 5.Remove the MPF transport gear - 18 tooth (A). Note: The MPF transport gear - 18 tooth will be tight and requires extra force to remove. 6.Remove the transport shaft collar (B). 7.Remove the e-clip with a prying tool securing the MPF transport roll assembly (C) to the MPF feed unit assembly. 8.Remove the two bushings 8 mm (D). 9.Remove the MPF transport roll assembly by moving it rightward then upward in the direction of the arrow. Note: When removing the MPF transport roll assembly (C), do not touch the rubber surface. Note: Before reinstalling the MPF transport roll assembly (C), do not touch the rubber surface. E-clip C D Right D B A
4-62MFP Service Manual 7500-XXX MPF pick solenoid / pick lever removal 1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58. 2.Remove the MPF feed unit assembly. See “MPF feed unit assembly removal” on page 4-54. 3.Remove the MPF feed drive gear group. See “MPF feed drive gear group removal” on page 4-59. 4.Remove one screw securing the pick solenoid (A). 5.Disconnect the connector from the pick solenoid (A). 6.Remove the MPF pick solenoid (A). Note: When removing the pick solenoid (A), lower the actuator (B). 7.Remove the pick lever (B). 8.Remove the spring (C). C B A RearActuator