Lexmark X 850 Owners Manual

Repair information4-273
7500-XXX
2000-sheet dual input (TTM)–drive motor assembly removal 
1.Remove the rear cover. See “2000-sheet dual input (TTM)–rear cover removal” on page 4-212.
2.Disconnect the connector from the 2TM/TTM drive motor (A). 
3.Remove two screws securing the 2TM/TTM drive motor (A). 
4.Remove the 2TM/TTM drive motor (A). 
AConnector 

4-274MFP Service Manual 7500-XXX
2000-sheet dual input (TTM)–2TM/TTM controller card assembly removal 
1.Remove the rear cover. See “2000-sheet dual input (TTM)–rear cover removal” on page 4-212.
2.Disconnect all the connectors from the 2TM/TTM controller card assembly (A). 
3.Remove four screws securing the 2TM/TTM controller card assembly (A). 
4.Remove the controller card assembly (A). 
A
B
2TM /TTM control card
P541
P548P554
P552
P549
DIP
switch
On
123
4
DIP switch settings, TTM 

Repair information4-275
7500-XXX
2000-sheet dual input (TTM)–clutch removal 
1.Remove the rear cover. See “2000-sheet dual input (TTM)–rear cover removal” on page 4-212.
2.Disconnect the connector from the machine to the bracket (A). 
3.Remove two screws securing the bracket (A) to the frame assembly. 
4.Remove the bracket (A). 
Note:  The bushing (B) and washer (C) may become detached from the shaft (D). 
5.Remove the e-clip securing the clutch gear - 38 tooth (E) to the shaft (D) using a prying tool,...

4-276MFP Service Manual 7500-XXX
—Ensure the harness does not come in contact with the gears. 
Duplex unit removals 
Front Right
Rear
Left 

Repair information4-277
7500-XXX
Duplex unit assembly removal 
1.Pull the option hookup cover (A) outward in the direction of the arrow to remove.
2.Disconnect the connector of the duplex unit assembly harness from the machine.
3.Release the duplex unit assembly harness clamp from the machine.
4.Open the duplex unit assembly.
Clamp
Connector
Rear
A Clamp
Clamp 

4-278MFP Service Manual 7500-XXX
5.Turn the two duplex docking locks (B) on the duplex unit assembly by 90 degrees counterclockwise to 
release the duplex unit assembly from the machine.
6.Remove the duplex unit assembly.
HoleHook
HoleFront BRelease
HookB 

Repair information4-279
7500-XXX
Duplex docking locks removal 
1.Remove the duplex unit assembly. See “Duplex unit assembly removal” on page 4-277.
2.Open the duplex unit assembly.
3.Turn the two duplex docking locks (A) 45 degrees, and release the hooks with needle nose pliers on the 
back side securing them to the duplex.
4.Remove the two duplex docking locks (A).
A
A
AA
A 

4-280MFP Service Manual 7500-XXX
Duplex support strap 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 information4-281
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).
C
Left
B 

4-282MFP Service Manual 7500-XXX
8.Remove the duplex left door support strap (B) from the duplex unit assembly.
Left HookB
B