Lexmark C 746 Service Manual

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Output bin extension cover removal
See “Output bin extension cover” on page 7-3 for the part number.
1.Turn the printer around, so the back is toward you.
2.Rotate the output bin extension cover toward the front of the printer.
3.Use a flathead screwdriver to ease the posts from the holes on one side. 
						

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Paper tray dust cover removal
See “Dust cover assembly” on page 7-3 for the part number.
1.Remove the paper tray.
2.Remove the left cover. See “Left cover removal” on page 4-31.
3.Remove the paper tray dust cover assembly.
Installation notes:
1.Place the paper tray dust cover into position.
2.Slide the left cover down until it locks into place. 
Note:  Be sure the post in the left cover engages the hole in the left cover, and that the post in the paper 
tray dust cover engages the hole in the left cover properly.
3.Replace the three screws on the left cover.
Note:  Verify that the paper tray dust cover swings properly. 
						

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Rear frame cover removal
See “Rear frame cover” on page 7-3 for the part number.
1.Remove paper tray
2.Loosen the eight screws (A) on the rear frame cover. 
Note:  Do not remove the screws.
3.Lift up on the rear frame cover to remove it from the back of the printer.
A 
						

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Rear left cover removal
1.Remove the left cover. See “Left cover removal” on page 4-31.
2.Separate the left cover and rear left cover by sliding the left rear cover as shown to disengage the latch (A). 
						

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Rear right cover removal
See “Rear right cover” on page 7-3 for the part number.
1.Remove the right cover. See “Right cover removal” on page 4-51. 
2.Press the two tabs (A) to separate the right cover from the rear right cover.
A 
						

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Rear upper cover removal
1.Remove the two screws (A).
2.Slide the cover up and remove the rear upper cover.
Note:  If you are removing the rear upper cover to access another part, leave the cooling fan filter attached, and 
you are done. If you need to replace the rear upper cover FRU, continue with the next step to remove the 
cooling fan filter FRU.
3.Remove the cooling fan filter. See “Cooling fan filter removal” on page 4-86. 
						

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Right cover removal
See “Right cover” on page 7-3 for the part number.
1.Remove the power cord from the printer.
2.Remove the paper tray.
3.Remove the rear upper cover. See “Rear upper cover removal” on page 4-50.
4.Open the front cover.
5.Open the top access cover.
6.Remove the two screws (A) on the inside front.
7.Remove the plastic screw (B) on the inside front.
B 
						

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8.Remove the three screws (C).
9.Lift the bottom of the cover out, pull up at the points shown, and remove the cover.
Note:  There are posts on the top access cover and the paper tray dust cover (D). When you reinstall, be 
sure to verify that the top access cover opens correctly and that the paper tray dust cover swings properly.
10.Remove the paper tray dust cover (E).
Note:  If you are removing the right cover to access another part, leave the right cover and the rear right cover 
attached, and you are done. If you need to replace the right cover FRU, continue with the next step to remove 
the separate rear right cover FRU.
DE 
						

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11.Press the two tabs (F) to separate the right cover from the rear right cover.
F 
						

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Top access cover assembly removal
See “Top access cover assembly, 2.3 inch” on page 7-3 for the part number.
Warning:  When replacing any one of the following components:
•Operator panel assembly
•System board
•Top access cover assembly
Only replace one component at a time. Replace the required component, and perform a POR before 
replacing a second component listed above. If this procedure is not followed, the printer will be 
rendered inoperable. 
1.Remove the rear frame cover. See “Rear frame cover removal” on page 4-47.
2.Disconnect the cable connectors at operator panel connector (A), JFMUSB1 (B), and JBIN1 (C) on the 
system board.
3.Remove the rear upper cover. See “Rear upper cover removal” on page 4-50. 
4.Open the front access cover and top access cover
5.Remove the two screws (D), one on either side of the printer, that connects the links.
CAB
D