Lexmark X 850 Owners Manual

Repair information4-3
7500-XXX
Printer front left cover removal
1.Remove the exit 2 unit assembly. See “Exit 2 unit assembly removal” on page 4-315.
2.Open the printer front door assembly (A). 
3.Remove the one screw securing the front left cover (B) to the machine. 
4.Remove the printer front left cover (B). 
B
A 

4-4MFP Service Manual 7500-XXX
Switch (printer front door interlock) removal
Note:  First remove the bridge unit and finisher, if equipped. Refer to the Options Service Manual.
1.Remove the top cover assembly. Go to“Top cover assembly removal” on page 4-5.
2.Remove the printer front door assembly. Go to“Printer front door assembly removal” on page 4-6.
3.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3.
4.Remove the front inner cover. See “Front inner cover removal”...

Repair information4-5
7500-XXX
Top cover assembly removal
Note:  First remove the bridge unit and finisher, if equipped. 
1.Remove the operator panel assembly. See “Operator panel assembly removal” on page 4-136.
2.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6.
3.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3.
4.Remove two screws securing the top cover assembly (A). 
5.Remove the top cover assembly (A) by sliding it...

4-6MFP Service Manual 7500-XXX
Printer front door assembly removal
1.Open printer front door assembly (A). 
2.Remove the front door support strap (B) securing the printer front door assembly (A) to the printer by 
releasing the plastic hook. 
3.With the front door support strap (B) disconnected, place the printer front door assembly (A) in the 
lowermost position. 
4.Slide the printer front door assembly (A) first to the right (as shown by arrow #1) to remove the printer front 
door assembly (A) from the...

Repair information4-7
7500-XXX
Front door support strap and front door magnetic catch removal
1.Open the printer front door assembly. 
2.Remove one screw securing the front door support strap (A) to the printer front door assembly (B). 
3.Remove the front door support strap (A). 
4.Release two hooks on the printer front door assembly securing the front door magnetic catch (C). 
5.Remove the front door magnetic catch (C). 
A
C
BHooks 

4-8MFP Service Manual 7500-XXX
Front inner cover removal
1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5.
2.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6.
3.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3.
4.Remove the PC cartridge. 
5.Remove the three screws securing the front inner cover (A). 
6.Remove the front inner cover (A). 
Note:  To reinstall the front inner cover (A), start with...

Repair information4-9
7500-XXX
Right upper cover removal
Note:  First, remove the bridge unit, finisher and finisher docking bracket, if equipped. 
1.Remove two screws securing the right upper cover (A). 
2.Move the upper edge of the right upper cover (A) downward and outward as shown by the arrow. 
3.Move the lower edge of the right upper cover (A) downward to release the right upper cover (A). 
4.Remove the right upper cover (A). 
Note:  The right upper cover (A) may take some extra force to remove....

4-10MFP Service Manual 7500-XXX
Right lower cover removal
1.Remove the right upper cover. See “Right upper cover removal” on page 4-9.
2.Pull out media Tray 1 and media Tray 2. 
3.Remove the right lower cover (A) by lifting it upward then outward.
Note:  The right lower cover may require some force to remove.
A
Rear 

Repair information4-11
7500-XXX
Rear motor cover removal
1.Remove the rear RIP card cover. See “Rear RIP card cover removal” on page 4-13.
2.Remove the controller box side cover. See “Controller box side cover removal” on page 4-18. 
3.Remove the two screws securing the rear motor cover (A). 
4.Open the rear motor cover (A) by swinging it outward in the direction of the arrow. 
5.Remove the rear motor cover (A). 
A Rear 

4-12MFP Service Manual 7500-XXX
Rear lower cover removal
1.Remove the rear RIP card cover. See “Rear RIP card cover removal” on page 4-13.
2.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11.
3.Remove the controller box lower cover. See “Controller box lower cover removal” on page 4-17.
4.Remove the two screws securing the rear lower cover (A). 
5.Remove the rear lower cover (A). 
Rear
A