Lexmark X 850 Owners Manual

Repair information4-293
7500-XXX
4.Open the duplex unit assembly.
5.Release the hook of the duplex left door support strap (B) securing the duplex left cover (C) to the duplex 
unit assembly. 
6.Remove the four screws securing the duplex left cover (C) to the duplex unit assembly.
7.Remove the duplex left cover (C). 
B
C HookB
Left 

4-294MFP Service Manual 7500-XXX
8.Disconnect the connector of the harness from duplex drive motor assembly (D) to the duplex main cable 
assembly.
9.Release the harness from the clamps of the duplex unit assembly.
10.Remove the three screws securing the bracket (E) to the duplex unit assembly.
11.Remove the bracket (E).
12.Remove the duplex drive gear 42T (F).
ClampsD
F
Rear
EConnector 

Repair information4-295
7500-XXX
Duplex switch (left cover interlock) removal 
1.Remove the duplex unit assembly. See “Duplex unit assembly removal” on page 4-277. 
2.Remove the two screws securing the duplex lower guide (A) to the duplex unit assembly.
3.Remove the duplex lower guide (A). 
A
Right 

4-296MFP Service Manual 7500-XXX
4.Open the duplex unit assembly.
5.Release the hook of the duplex left door support strap (B) securing the duplex left cover (C) to the duplex 
unit assembly. 
6.Remove the four screws securing the duplex left cover (C) to the duplex unit assembly.
7.Remove the duplex left cover (C). 
 
B
C HookB
Left 

Repair information4-297
7500-XXX
8.Disconnect the connector from the switch (duplex left door interlock) (D).
9.Release the hooks securing the switch (duplex cover interlock) (D) to the bracket (E).
10.Remove the switch (duplex left door interlock) (D). 
Connector
Hooks
E D
Rear 

4-298MFP Service Manual 7500-XXX
Duplex media in actuator removal 
1.Remove the duplex unit assembly. See “Duplex unit assembly removal” on page 4-277. 
2.Remove the two screws securing the duplex lower guide (A) to the duplex unit assembly.
3.Remove the duplex lower guide (A).
A
Right 

Repair information4-299
7500-XXX
4.Open the duplex unit assembly.
5.Release the hook of the duplex left door support strap (B) securing the duplex left cover (C) to the duplex 
unit assembly. 
6.Remove the four screws securing the duplex left cover (C) to the duplex unit assembly.
7.Remove the duplex left cover (C). 
 
B
C HookB
Left 

4-300MFP Service Manual 7500-XXX
8.Remove the spring (D) from the duplex wait actuator (E).
9.Turn the duplex wait in actuator (E) 180 degrees, and move it rightward and upward in the direction of the 
arrow.
10.Remove the duplex wait actuator (E). 
E
D
Left 

Repair information4-301
7500-XXX
Duplex drive motor assembly removal 
1.Remove the duplex unit assembly. See “Duplex unit assembly removal” on page 4-277.
2.Remove the two screws securing the duplex lower guide (A) to the duplex unit assembly.
3.Remove the duplex lower guide (A).
A
Right 

4-302MFP Service Manual 7500-XXX
4.Open the duplex unit assembly.
5.Release the hook of the duplex left door support strap (B) securing the duplex left cover (C) to the duplex 
unit assembly.
6.Remove the four screws securing the duplex left cover (C) to the duplex unit assembly.
7.Remove the duplex left cover (C). 
B
C HookB
Left