Lexmark X 850 Owners Manual

Repair information4-73
7500-XXX
Transfer roll assembly removal
1.Open the printer left door assembly. 
2.Release the two plastic hooks on the transfer roll assembly (A). 
3.Remove the transfer roll assembly (A) by lifting it upward. 
Note:  When removing the transfer roll assembly (A), do not touch the roll surface. 
Note:  Before reinstalling the transfer roll assembly (A), do not touch the roll surface. 
HookA
LeftHook 

4-74MFP Service Manual 7500-XXX
Printer left door support strap removal
1.Remove the MPF rear cover. See “MPF rear cover removal” on page 4-58.
2.Open the printer left door assembly (A).
3.Remove the screw securing the printer left door support strap (B) to the printer left door (A).
4.Remove the e-clip securing the shaft (C) to the printer.
5.Remove the shaft (C).
6.Remove the printer left door support strap (B).
A
B
C 

Repair information4-75
7500-XXX
Printer left door assembly removal
Note:  First, remove the duplex unit assembly if equipped. 
1.Open the printer left door assembly. 
2.Remove the screw securing the left door support strap (A) to the printer left door assembly (B). 
3.Remove the printer left door assembly (B) by lowering it then lifting upward. 
A
B
Front 

4-76MFP Service Manual 7500-XXX
Switch (printer left door interlock) removal
1.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11.
2.Open the printer left door assembly.
3.Remove the one screw securing the bracket (A) to the printer.
4.Remove the bracket (A).
5.Disconnect the connector from the switch (printer left door interlock) (B).
6.Release the hooks securing the switch (printer left door interlock) (B) to the bracket (A).
7.Remove the switch (printer left door interlock) (B)....

Repair information4-77
7500-XXX
Transfer roll guide assembly removal 
1.Open the printer left door assembly. 
2.Remove the printer left door assembly. See “Printer left door assembly removal” on page 4-75.
3.Remove the transfer roll assembly. See “Transfer roll assembly removal” on page 4-73.
4.Release the two hooks securing the transfer roll guide assembly (A) to the printer left door assembly (B). 
5.Remove the transfer roll guide assembly (A).  

4-78MFP Service Manual 7500-XXX
Printer left door assembly handle removal
1.Open the printer left door assembly. 
2.Remove the printer left door assembly. See “Printer left door assembly removal” on page 4-75.
3.Remove the transfer roll guide assembly. See “Transfer roll guide assembly removal” on page 4-77.
4.Remove five screws securing the metal frame (A) to the plastic cover (B). 
5.Remove the metal frame (A) by lifting it upward and sliding outward. 
6.Remove the three screws securing the handle...

Repair information4-79
7500-XXX
Registration 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 printer left door assembly. See “Printer left door assembly removal” on page 4-75.
4.Remove the bosses on both ends of the vertical turn mylar guide (A). 
5.Remove the vertical turn mylar guide (A). 
Warning:  The vertical turn mylar guide (A) requires moderate force...

4-80MFP Service Manual 7500-XXX
Registration clutch 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.Remove the registration roll assembly. See “Registration roll assembly removal” on page 4-79.
5.Remove the e-ring with a prying tool securing the registration clutch assembly (A) to...

Repair information4-81
7500-XXX
Sensor (registration) 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.Remove the registration roll assembly. See “Registration roll assembly removal” on page 4-79.
5.Release the hooks securing the sensor (registration) (A) to the registration roll assembly...

4-82MFP Service Manual 7500-XXX
MPF/transport drive motor assembly removal
1.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11.
2.Remove the rear lower cover. See “Rear lower cover removal” on page 4-12.
3.Open the printer left door assembly.
4.Remove the e-clip with needle nose pliers.
Note:  This e-clip is located inside the machine behind the printer left door.
5.Release the hook and disconnect the connector from the MPF/transport drive motor assembly (A).
6.Remove the three...