Lexmark X543 Service Manual

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19.Remove the steel hinge stud (H). Save this for use on the replacement flatbed.
20.Remove the redrive (I) See“Redrive unit” on page 4-69., 
21.Remove the cable cover plates and scanner homing plates (J). These will be used on the replacement 
flatbed unit.
Warning:  When replacing the rear cable cover plate, the cables must be routed as shown above. Failure to do 
so could damage the cables and lead to possible paper skews and jamming.
H
JI 
						

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22.Remove the screws (K) securing the front hinge to the flatbed.
23.Remove the hinge; it will be used on the replacement flatbed unit.
Note:  The redrive, cable covers, operator panel assembly, scanner flatbed guides, op panel cable, and 
USB cable need to be transferred to the replacement flatbed unit.
Note:  After replacing the flatbed unit, you will need to perform the flatbed registration procedure. See 
“Scanner Manual Registration” on page 3-35.
K
K 
						

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Preparing and installing re new flatbed
1.
Unbox the scanner, and place it top down on a non-marring surface.
2.Unfold the ribbon cable, and replace the toroid (A) from the old flatbed.
A 
						

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3.Locate the folding guide line (B), and remove the paper from the adhesive strip located next to the folding 
guide line on the scanner. 
4.Fold the ribbon cable at a 90 degree angle, align the fold of the cable with the fold line on the flatbed, and 
press the cable down on the adhesive so it adheres to the flatbed.
B 
						

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5.Locate the second folding guide line (C), and remove the paper from the adhesive strip.
6.Fold the ribbon cable a second time at a 90 degree angle, align the fold of the cable with the fold line on the 
flatbed, and press the cable down on the adhesive so it adheres to the flatbed. The ribbon cable should lie 
flat against the flatbed, and there should be no slack on the ribbon cable between the two folds.
7.Replace the plastic front hinge from the old scanner.
8.Replace the cable cover plates and scanner alignment guides from the old scanner.
9.Replace the steel hinge stud from the old scanner.
10.Replace the redrive unit, AIO release lever, side covers, and operator panel.
C 
						

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Duplex ADF rear cover 
1.While lifting the ADF, use a flatblade screwdriver to pry open the three tabs (A) on the bottom of the ADF 
cover. 
2.Lift and remove the rear cover from the ADF assembly.
A 
						

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Duplex ADF removal
1.Remove the duplex ADF rear cover from the ADF assembly. See “Duplex ADF rear cover” on page 4-62. 
Save the cover for use on the new ADF unit.
2.Disconnect the ground cable (A) from the ADF assembly.
3.Disconnect the ADF cable (B) from the ADF card located on the ADF assembly.
4.Carefully pull the ADF cable and grommet away from the ADF assembly.
5.Lift the ADF to an upright position.
6.Use a screwdriver to release the right hinge (C) from the flatbed unit.
7.Remove the ADF assembly.
Note:  After installing the new ADF unit, you will need to perform the duplex ADF registration procedure. 
See “Scanner Manual Registration” on page 3-35.
AB
C 
						

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Simplex ADF rear cover
1.While lifting the ADF, use a flatblade screwdriver to pry open the two tabs on the bottom of the ADF cover.
2.Lift and remove the rear cover from the ADF assembly.
Simplex ADF removal
1.Tilt the flatbed cover to the upright position.
2.Lift the ADF up and away from the flatbed.
3.Remove the simplex ADF rear cover from the ADF assembly. See “Simplex ADF rear cover” on 
page 4-64. Save the cover for use on the new ADF unit.
4.Disconnect the ADF cable from both the ADF relay card located on the ADF assembly.
5.Disconnect the ground cable from the ADF assembly.
6.Carefully pull the ADF cable and grommet away from the ADF assembly.
7.Lift the ADF to an upright position.
8.Use a screwdriver to release the left hinge from the flatbed unit.
9.Remove the ADF assembly.
Note:  After installing the new ADF unit, you will need to perform the ADF registration procedure. See 
“Scanner Manual Registration” on page 3-35.
ADF input tray
1.Firmly grasp the ADF input tray on both sides.
2.Pull the ADF input tray out of the ADF. 
						

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ADF cable
1.Remove the flatbed assembly. See “Flatbed removal” on page 4-53.
2.Remove the left scanner cover. See “Cover scanner left” on page 4-70.
3.Remove the cable from the channel in the flatbed.
ADF separator pad
1.Remove the ADF separator roll. See “ADF separator roll assembly” on page 4-67.
2.Pinch the two tabs on each side of the pad inward. 
						

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3.Tilt the pad up, and lift it out of the ADF assembly.