Lexmark C 746 Service Manual

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Top cover camshaft assembly removal
See “Top cover camshaft assembly” on page 7-14 for the part number.
1.Open the front cover access door cover.
2.Open the top access cover.
3.Remove the two screws (A) from the links on either side, and disengage the links.
4.Rotate the top access cover back, and place a screwdriver in the cable hole in the frame to hold the cover 
in place. 

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5.Remove the fuser. See “Fuser removal” on page 4-110. 
6.Remove the top screw (B), and loosen the other screw (C). This will allow you to flex the EP drive. 
7.Remove the two screws (D). 

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8.Rotate the camshaft up using the camshaft actuator handles (E) so you can access the other two 
screws (F), and remove them.
9.Flex the EP drive assembly to remove the right side of the camshaft from the boss (G), and lift to remove 
the camshaft. 

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Installation notes:
1.On the left side, align the mark on the idler gear (A) with the mark on the camshaft gear (B), and slide the 
camshaft into place, meshing the gears on the left side.
AB 

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2.Rotate the camshaft up using the camshaft actuator handle (C), and make sure the gears on the right side 
mesh so the first gear tooth of the camshaft aligns with the first two gear teeth of the EP drive actuator 
rack (D).
Note:  Make sure the actuator rack on the EP drive is all the way back.
3.Flex the EP drive on the right to seat the end of the shaft into the boss (E) on the EP drive.
4.Make sure the left and right camshaft brackets are fully...

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5.Rotate the camshaft using the camshaft actuator handle, and replace the two screws (G).
6.Replace the screw in the EP drive that allowed you to flex the EP drive, and tighten the other screw (see 
step 6 of the removal).
7.Replace the top access cover assembly.
8.Replace the fuser, the cartridges, and close the covers. 

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Transfer module removal
See “Transfer module” on page 7-7 for the part number.
1.Disconnect the transfer module cable (A). 
2.Press the two tabs (B) to release the front access cover assembly.
3.Press the two tabs (C) on either side of the transfer module, and lift out the transfer module.
Note:  Leave the photoconductor units on the transport belt when removing. 
Warning:  To avoid damaging the photoconductor drum, place the transfer module with the...

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Note:  If you are removing the transfer module to access another part, leave the photoconductor units attached, 
and you are done. If you need to replace the transport belt, continue with the next step to remove the separate 
photoconductor units.
4.Remove the photoconductor units. Lift the right end handle (D) of the photoconductor unit, releasing from 
the mount.
5.Lift the unit up and away from the left side of printer, ensuring the left end of the...

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Transport cable removal
1.Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Remove the transport belt assembly. Leave the photoconductor units in place. See “Transfer module 
removal” on page 4-171. 
3.Disconnect the transport cable from the system board at JTPS1 connector (A).
Note:  The cable connector on the system board end of the cable is smaller than the connector on the front 
access door, and it may be easier to get...

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4.Extract the cable through the opening in the frame to the right side of the printer (B).
5.Remove the cable from the five cable restraints (C).
6.Remove the cable from the three openings in the cable channel (D) on the right side of the front access 
door.
7.Remove the six screws (E) from the cable shield.