Lexmark X 850 Owners Manual

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....

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...

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...

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...

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...

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...

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...

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