Lexmark C 746 Service Manual

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Option cable removal
1.Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Disconnect the cable connector at JOPT1 (A) on the system board.
3.Replace the rear frame cover to protect the system board.
4.Position the printer on its back.
5.Remove the two screws (B). 
						

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6.Press the tabs together to remove the option cable connector.
Note:  Be sure to note the cable routing for reinstallation. 
						

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Paper pick mechanism assembly removal
See “Paper pick assembly” on page 7-7 for the part number.
1.Remove the paper tray.
2.Remove the waste toner assembly. See “Waste toner assembly removal” on page 4-176. 
3.Remove the rear frame cover. See “Rear frame cover removal” on page 4-47.
4.Disconnect the connector in JFDPCK1 (A) and JTRAY1 (B) on the system board.
5.Push the cables through the hole in the frame (C).
6.Open the front access cover. 
						

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7.Remove the transfer module with the photoconductor units attached. 
a.Disconnect the transfer module cable (D). 
b.Press the two tabs (E) to release the front access cover assembly, and lower the front access door 
cover.
c.Press the two tabs (F) 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 
photoconductor units on a clean surface. Never expose the photoconductor units to light for a prolonged 
period of time. Place a clean, dry cloth over the transfer module and photoconductor units until they are 
required.
8.Remove the toner cartridges.
Warning:  Do not touch the developer rolls.
9.Remove the four screws (G) from the bottom pan.
EF
D 
						

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10.With one hand, disengage the gear (H), then grasp the paper pick assembly, and pull forward and 
downward to disengage the assembly until the front (J) and rear locking tabs release (not visible).
11.Lower the paper pick mechanism, and remove through the front of the printer. 
Note:  Make sure the JTRAY1 and JTRAY2 connectors do not bind when passing through the frame 
access hole.
Installation notes:
1.Remove the waste toner assembly. See “Waste toner assembly removal” on page 4-176.
2.Replace the rear frame cover to protect the system board.
3.Turn the printer on its back.
4.Slide the paper pick assembly toward the back of the printer, and down to engage the tabs (A). 
						

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5.Engage the gear (B).  
						

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6.Reach into the printer, and replace the front right screw (C) to secure the paper pick assembly.
7.Set the printer upright.
8.Secure the remaining three screws (D).
9.Remove the rear frame cover.
10.Route the cables through the hole in the frame, and connect them to JFDPCK1 (E) and JTRAY1 (F).
11.Replace the rear frame cover.
12.Replace the waste toner assembly. 
13.Replace the toner cartridges.
14.Replace the transfer module with the photoconductor units.
15.Close the front access cover.
16.Replace the paper tray. 
						

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Photoconductor unit removal
Not a FRU
Warning:  To avoid damaging the photoconductor drum, hold the photoconductor units by their handle and 
place the photoconductor units on a clean surface. See “Handing the photoconductor unit” on 
page 4-2 for additional information.
1.Open the front access door.
2.Lift the right end handle (A) of the photoconductor unit, releasing from the mount.
3.Lift the unit up and away from the left side of printer, ensuring the left end of the photoconductor is released 
from the holding pin (B).
Installation note: If a new photoconductor unit is installed, reset the life count value in the printer memory.
•If a message appears on the operator panel:
1.When 84  PC Unit Life Warning or 84 Replace  PC Unit appears, select Supply 
Replaced, and then press  . 
Replace Supply displays.
2.Select Cyan PC Unit, Magenta PC Unit, Yellow PC Unit, or Black PC Unit based on the 
photoconductor unit that was just replaced, and then press  .
 PC Unit Replaced displays.
3.Select Yes, and then press   to clear the message.
•If no message appears:
1.Press Menu ().
2.Select Supplies Menu, and press  .
3.Press  to select Replace Supply. 
4.Select Cyan PC Unit, Magenta PC Unit, Yellow PC Unit, or Black PC Unit based on the 
photoconductor unit that was just replaced, and then press  .
 PC Unit Replaced displays.
Press  to select Yes.
A
B 
						

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Pick arm roll removal and replacement
See “Pick arm roll” on page 7-7 for the part number.
The auto compensator pick roll tires are located in the base printer. There are also tires in all input options. If you 
have additional input options, and you are having problems with media picking, replace these tires also. Always 
replace the pick arm rolls in pairs. The rolls come in a package of two.
Warning:  Remove only the rubber tires and not the pick tire assembly to avoid losing small parts. 
1.Remove the paper tray.
2.Pull the paper pick arm (A) down.
3.Remove the pick arm roll (B) from the pick arm roll assembly (C). Repeat for the other pick arm roll (D).
A
BC D 
						

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Installation notes: Install the new rubber tires with the surface texture turning in the direction as shown.
Note:  Feel the rubber surface to verify it turns properly in the direction shown.
Printer pad removal
1.Slide the corner of the printer containing the damaged pad over the corner of the table. 
2.Remove the side cover that corresponds to the damaged pad so you can see if the pad fully seats in the 
installation holes.
3.Pull the pad tabs (A) from the bottom of the printer.
Installation note: Verify that the pad fully seats in the installation holes.