Lexmark X 850 Owners Manual

Repair information4-183
7500-XXX
Switch (ADF left cover interlock) removal
1.Open the ADF left cover assembly.
2.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166.
3.Remove the screw and washer securing the switch (ADF left cover interlock) (A).
4.Disconnect the two connections to the switch (ADF left cover interlock) (A) with needle nose pliers. 
5.Remove the switch (ADF left cover interlock).
A
Screw
Connections
Front 

4-184MFP Service Manual 7500-XXX
Sensor (ADF width APS 1) 
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in 
which the required sensor is easily removed.
6.Release the hook...

Repair information4-185
7500-XXX
Sensor (ADF width APS 2)
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in 
which the required sensor is easily removed.
6.Release the hook...

4-186MFP Service Manual 7500-XXX
Sensor (ADF width APS 3)
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the under of the ADF transport roll (B), and move it to the position in which 
the required sensor is easily removed.
6.Release the hook...

Repair information4-187
7500-XXX
Sensor (ADF registration)
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in 
which the required sensor is easily removed.
6.Remove the screw...

4-188MFP Service Manual 7500-XXX
Sensor (ADF pre-registration)
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in 
which the required sensor is easily removed.
6.Release the...

Repair information4-189
7500-XXX
Sensor (ADF inverter)
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly to its uppermost position.
3.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
4.Remove the two screws securing the sensor mount (A) to the ADF.
5.Slide the sensor mount (A) from the underside of the ADF transport roll (B), and move it to the position in 
which the required sensor is easily removed.
6.Release the hooks...

4-190MFP Service Manual 7500-XXX
Actuator/media guide assembly removal
1.Open the ADF left cover assembly.
2.Lift the separation roll guide assembly (A) to its uppermost position.
3.Remove the two screws securing the actuator/media guide assembly (B) to the ADF.
4.Remove the actuator/media guide assembly (B).
A
Rear
B 

Repair information4-191
7500-XXX
Inverter gate removal
1.Remove the actuator/media guide assembly. See “Actuator/media guide assembly removal” on 
page 4-190.
2.Flex the tab, and remove the boss from the hole.
3.Remove the inverter gate (A).
ADF registration roll assembly removal
1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159.
2.Open the ADF left cover assembly.
3.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166.
4.Remove the ADF...

4-192MFP Service Manual 7500-XXX
Warning:  Do not touch the rubber surface of the ADF registration roll assembly (H).
Note:  Before reinstalling the registration secondary drive belt (E), ensure that it is routed properly.
Note:  Loosen and then retighten the two screws that set the belt tension after tension spring (C) is attached.
Plastic
clipIG
C
E
F D
Front
H
Plastic
clip
A
B