Lexmark X 850 Owners Manual

Repair information4-233
7500-XXX
2000-sheet dual input (TTM)–tray 4 front cables removal 
1.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
2.Remove the tray 4 front cover. See “2000-sheet dual input (TTM)–tray 4 front cover removal” on 
page 4-228.
3.Place the tray 4 assembly on its right side, as shown in the figure. 
4.Remove the E-clip with a prying tool securing the front tray lift pulley (A) to the tray lift shaft assembly (B). 
5.Remove the...

4-234MFP Service Manual 7500-XXX
7.Place the tray 4 assembly back in its upright position. 
8.Remove two E-clips with a prying tool securing the two small pulleys (D) on the front of the frame 
assembly. 
9.Remove the two small guides (E) and the two small pulleys (D). 
10.Remove the tray 4 front cables (C) from the bottom plates (F). 
Note:  Before re-installing: 
—It is recommended that all four cables be replaced. 
—Ensure tray 4 front cables (C) are not twisted or kinked. 
—Route the cables properly...

Repair information4-235
7500-XXX
2000-sheet dual input (TTM)–tray 4 media guide rack and pinion removal 
1.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
2.Place the tray 4 assembly on its right side, as shown in the figure. 
3.Remove two e-clips securing the two pinion gears (A) to the frame assembly (B). 
4.Remove two pinion gears (A). 
5.Remove four screws securing the two rack gears (C) to the frame assembly (B). 
C
E-ring
A
A
CB E-ring 

4-236MFP Service Manual 7500-XXX
6.Remove the rack gears (C). 
Note:  Before re-installing, move the two side guides (D) of the frame assembly (B) fully outward before 
installing the two pinion gears (A). 
DD 

Repair information4-237
7500-XXX
2000-sheet dual input (TTM)–tray 4 media guide lock assembly removal 
1.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
2.Remove the tray 4 front cover. See “2000-sheet dual input (TTM)–tray 4 front cover removal” on 
page 4-228.
3.Remove the tray 4 rear cable assembly. See “2000-sheet dual input (TTM)–tray 4 rear cables 
removal” on page 4-230.
4.Remove the tray 4 front cable assembly. See “2000-sheet dual input...

4-238MFP Service Manual 7500-XXX
2000-sheet dual input (TTM)–tray 4 mylar actuator removal 
1.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
2.Remove the tray 4 front cover. See “2000-sheet dual input (TTM)–tray 4 front cover removal” on 
page 4-228.
3.Remove the tray 4 rear cable assembly. See “2000-sheet dual input (TTM)–tray 4 rear cables 
removal” on page 4-230.
4.Remove the tray 4 front cable assembly. See “2000-sheet dual input (TTM)–tray 4...

Repair information4-239
7500-XXX
2000-sheet dual input (TTM)–media feed unit assembly removal (tray 4)
1.Remove the tray 3 assembly. See “2000-sheet dual input (TTM)–tray 3 assembly removal” on 
page 4-217.
2.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
3.Remove the tray 4 transport assembly. See “2000-sheet dual input (TTM)–tray 4 media transport 
assembly removal” on page 4-229. 
4.Disconnect the two connectors from the media feed unit assembly...

4-240MFP Service Manual 7500-XXX
6.Remove one screw securing the front bracket (B). 
7.Remove the front bracket (B). 
8.Move the media feed unit assembly (A) leftward and upward in the direction of the arrow to remove it. 
9.Remove the two screws securing the lower guide (C) to the media feed unit assembly (A). 
10.Remove the lower guide (C). 
11.Remove two screws securing the upper guide (D) to the media feed unit assembly (A). 
12.Remove the upper guide (D). 
13.Remove two screws securing the rear...

Repair information4-241
7500-XXX
2000-sheet dual input (TTM)–sensor (tray 4 feed-out) removal 
1.Remove the tray 3 assembly. See “2000-sheet dual input (TTM)–tray 3 assembly removal” on 
page 4-217.
2.Remove the tray 4 assembly. See “2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216.
3.Disconnect the connector from the sensor (tray 4 feed-out) (A). 
4.Release the hooks securing the sensor (tray 4 feed-out) (A) to the upper guide (B). 
5.Remove the sensor (tray 4 feed-out) (A)....

4-242MFP Service Manual 7500-XXX
2000-sheet dual input (TTM)–switch (TTM media size) removal 
Note:  This removal procedure may be applied to tray 3 and tray 4. 
1.Remove the tray 3 assembly See (“2000-sheet dual input (TTM)–tray 3 assembly removal” on 
page 4-217) or tray 4 assembly (“2000-sheet dual input (TTM)–tray 4 assembly removal” on 
page 4-216). 
2.Disconnect the connector from the switch (TTM media size) (A). 
3.Remove one screw securing the switch (TTM media size) (A). 
4.Remove the switch...