Lexmark X 850 Owners Manual
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Repair information4-63 7500-XXX MPF feed shaft 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 MPF pick roll. See “MPF pick roll removal” on page 4-64. 4.Remove the MPF feed drive gear group. See “MPF feed drive gear group removal” on page 4-59. 5.Remove the two e-rings with a prying tool that secures the feed shaft assembly (A) to the MPF feed unit assembly. 6.Remove the two bushings (B). 7.Release the hooks securing the two feed shaft cams (C), and slide them inward towards the center of the MPF feed shaft assembly (A). 8.Remove the feed shaft assembly (A) by moving it to the side then upwards in the direction of the arrow. Hook Rear CE-Clip BCAC B E-Clip
4-64MFP Service Manual 7500-XXX MPF pick roll 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 (A) to the MPF feed unit assembly. 4.Remove the upper bracket (A). 5.Release the two hooks securing the two feed shaft cores (B), and slide them both outward. 6.Remove the MPF pick roll (C) from the feed shaft assembly (D) by sliding it to the right in the direction of the arrow and lifting upward. Note: When removing the MPF pick roll (C), do not touch the rubber surface. Note: Before reinstalling the MPF pick roll assembly (C), do not touch the rubber surface. C B Left B DA PinHook Hook
Repair information4-65 7500-XXX MPF fold down tray 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 MPF upper frame. See “MPF media out actuator and upper frame removal” on page 4-55. 4.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). 5.Remove three screws securing the idler gear bracket assembly (B) to the MPF feed unit assembly. 6.Remove the idler gear bracket assembly (B). 7.Remove the green ground wire (D) from the idler gear bracket assembly (B). 8.Remove the green (D) ground wire from the clamp. Hook RearAC B D
4-66MFP Service Manual 7500-XXX 9.Disconnect the connector leading to the MPF fold down tray assembly (E). 10.Raise the MPF fold down tray assembly (E) to its upright position, and slide it to the side. 11.Remove the MPF fold down tray assembly (E). Note: Before reinstalling the idler gear bracket assembly (B), ensure the wiring is not pinched. Front E
Repair information4-67 7500-XXX Vertical drive gear 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 printer left door assembly. See “Printer left door assembly removal” on page 4-75. 4.Open the printer left lower door assembly. 5.Remove the three screws securing the vertical drive gear assembly (A). 6.Release the harness from the clamp on the vertical drive gear assembly (A). 7.Remove the vertical drive gear assembly (A). Left A
4-68MFP Service Manual 7500-XXX Switch (left lower door interlock) 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 printer left door assembly. See “Printer left door assembly removal” on page 4-75. 4.Remove the vertical drive gear assembly. See “Vertical drive gear assembly removal” on page 4-67. 5.Disconnect the harness from the switch (left lower door interlock) (A). 6.Release the hooks securing the switch (left lower door interlock) (A) to the vertical drive gear assembly (B). 7.Remove the lower switch (left lower door interlock) (A). B A Left
Repair information4-69 7500-XXX Media transport roll assembly / gear 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 printer left door assembly. See “Printer left door assembly removal” on page 4-75. 4.Open the printer left lower door assembly. 5.Remove the two screws securing the tray 2 feed-out sensor guide (A). 6.Remove the tray 2 feed-out sensor guide (A) while pulling on its center most point. 7.Remove the e-clip with needle nose pliers on the front side securing the media transport roll (B). 8.Remove the media transport roll assembly (B) by sliding it in the direction of the arrow and pulling out. Note: When removing the media transport roll assembly (B), do not touch the rubber surface. Note: When removing the media transport roll (B), the bushings and gear may become detached. 9.Remove the media transport roll gear 18 tooth (C). 10.Remove the transport roll rear bushing (D). 11.Remove the transport roll front bushing (E). Note: Before reinstalling the media transport roll assembly (B), do not touch the rubber surface. A D C B E E-clip
4-70MFP Service Manual 7500-XXX Printer left lower door assembly removal 1.Open the printer left lower door assembly. 2.Remove the two screws securing the bracket (A). 3.Remove the bracket (A). 4.Pull the cap of the hinge pin (B) out with a prying tool to remove the hinge pin (B) from the bracket (A). 5.Remove the hinge pin (B). 6.Remove the printer left lower door assembly (C) from the bracket (A). C A B Cap Front
Repair information4-71 7500-XXX Printer left lower pinch roll assembly removal 1.Open the printer left lower door assembly. 2.Remove the two screws securing the left lower pinch roll assembly (A) to the printer left lower door assembly (B). Note: The media guide (C) can be slightly lifted to gain better access to the attaching screws. 3.Release two hooks securing the left lower pinch roll assembly (A) to the printer left lower door assembly (B). 4.Remove the left lower pinch roll assembly (A). B C Screw driverA C
4-72MFP Service Manual 7500-XXX Left lower door handle assembly removal 1.Open the printer left lower door assembly. 2.Remove the printer left lower pinch roll assembly. See “Printer left lower pinch roll assembly removal” on page 4-71. 3.Remove the left lower door handle (A). 4.Remove the spring (B). A B