Lexmark C 746 Service Manual

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Printhead verification
You can verify that the printhead is the failing FRU by following this procedure:
1.Turn the printer off, and remove the power cord from the outlet. Remove all cords and cables from the 
printer before beginning.
2.Locate the printer on a corner of a work area so the front and back can be accessed. 
						

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3.Remove the rear frame cover.
a.Loosen the eight screws on the rear frame cover (A). 
Note: Do not remove the screws.
b.Lift up on the rear frame cover to remove it from the back of the printer. 
						

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4.Carefully unplug the printhead ribbon (B) and the mirror motor cables (C) from the system board, and 
carefully connect the printhead ribbon and mirror motor cables from the new printhead into the system 
board. It is important to position the laser in the printhead down into the packaging as shown.
Note:  Use the packaging that came with the printhead FRU to prop the printhead up.
5.Connect the power cord to the outlet and to the printer. Reconnect any cords.
6.Enter the Diagnostics menu (press and hold buttons 3 and 6, turn on the printer, and release the buttons 
when the progress bar displays.) 
7.Perform the Mirror Motor Test:
a.Select PRINTHEAD TESTS.
b.Select Mirror Motor Test.
The panel displays Motor Running. 
At the end of the test, the panel displays either Pass or Fail.
•If the test fails, replace the system board.
•If the test passes, perform the Servo Laser Test in step 8.
8.Perform the Servo Laser Test:
a.Press   or   to go back to the PRINTHEAD TESTS menu. 
b.Select Servo Laser Test.
The panel displays Servo Laser Test—Motor Running…. 
At the end of the test, the panel displays either Pass or Fail.
•If the test fails, replace the system board.
•If the test passes, install the printhead FRU. 
						

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Paper Jams
Error jam locations
The following illustration shows the location and error codes generated for specific paper jams and the 
corresponding locations of these jams. 
						

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Clearing jams
By carefully selecting papers and specialty media (see “Paper guidelines” on page 1-13) and loading it 
properly, you should be able to avoid most jams. If jams do occur, follow the steps outlined below. 
To resolve the jam messages, you must clear the entire paper path, and press   or touch   to clear the 
message and resume printing. The printer prints a new copy of the page that jammed if Jam Recovery is set to 
On or Auto; however, the Auto setting does not guarantee the page will print.
Note:  Jam recovery is set to Auto by default. When jam recovery is set to Auto, the memory that holds the 
image of a page may be re-used after the page is printed but before it has successfully exited the printer if that 
memory is needed for another use. Therefore, a jammed page may or may not be reprinted, depending on the 
overall memory usage in the printer.
Avoiding jams
The following hints can help you avoid jams:
•Use only recommended paper or specialty media.
For more information, refer to the Card Stock & Label Guide available on the Lexmark Web site at 
www.lexmark.com/publications.
•Do not load too much paper. Make sure the stack height does not exceed the indicated maximum height.
•Do not load wrinkled, creased, damp, or curled paper.
•Flex, fan, and straighten paper before loading it.
•Do not use paper that has been cut or trimmed by hand.
•Do not mix paper sizes, weights, or types in the same stack.
•Store the paper in an appropriate environment.
•Do not remove trays while the printer is printing. Wait for Load tray  or Ready to appear before 
removing a tray.
•Do not load the multipurpose tray while the printer is printing. Load the tray prior to printing, or wait for Load 
Multipurpose tray with  to appear.
•Push all trays in firmly after loading paper.
•Make sure the guides in the trays are properly positioned and are not pressing too tightly against the 
paper.
•Make sure all paper sizes and paper types are set correctly in the printer control panel menu.
•Make sure all printer cables are attached correctly. For more information, refer to the setup documentation.
CAUTION—HOT SURFACE
The fuser and the inside of the printer near the fuser may be hot. Wait for the fuser to cool 
before clearing jams from this area. 
						

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200 paper jams
If paper jams behind the inner door, but not under the photoconductor units, 200.xx Paper jam appears.
Note:  To avoid overexposing the photoconductor units, do not leave the front door open longer than 10 
minutes.
1.Open the front door.
2.Pull the jammed paper up and out to remove it from behind the toner cartridge area.
Note:  Make sure all paper fragments are removed.
3.Close the front door.
4.Press   or touch  .
200 or 201 paper jam
If paper jams under the photoconductor units, 200.xx Paper jam or 201.xx Paper jam may appear.
1.Open the front door.
Note:  To avoid overexposing the photoconductor units, do not leave the front door open longer than 10 
minutes.
2.Pull the paper forward if it is lodged under the photoconductor units.
Note:  You may need to remove the photoconductor units if the paper is lodged too tightly under them. 
						

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3.Remove each photoconductor unit, and place it on a flat surface.
4.Remove the jammed paper, and then replace each photoconductor unit.
5.Close the front door.
6.Press   or touch  .
201 paper jam
If paper is jammed under the fuser or the top cover, 201.xx Paper jam appears.
1.Open the front door, and then open the top cover.
Warning:  Potential Damage: To avoid overexposing the photoconductor units, do not leave the front 
door open longer than 10 minutes.
2.Determine where the jam is located:
a.If paper is visible under the fuser, grasp it on each side and pull it forward.
b.If paper is not visible, turn the screws on the fuser unit to the left. 
						

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c.Lift the unit and pull to remove it.
d.Remove the jammed paper.
e.Replace the fuser unit, and then turn the screws to the right to fasten it securely. 
3.Close the top cover, and then close the front door.
4.Press   or touch  .
202 paper jam
If paper is jammed both under the fuser unit and in the slot behind the fuser unit, 202.xx Paper jam appears.
1.If the paper is visible in the standard exit bin, grasp the paper and pull it away from the bin.
2.Open the front door, and then open the top cover.
3.Grasp the paper on each side, and pull it forward. 
						

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If the paper is jammed behind the fuser, you will need to remove the fuser unit.
a.Turn the screws on the fuser unit to the left.
b.Lift the unit and pull to remove it.
c.Pull the paper gently out of the printer or up toward the standard exit bin to remove it.
d.Place the fuser unit back into the printer, and turn the screws to the right to fasten the fuser unit 
securely.
4.Close the top cover, and then close the front door.
5.Press   or touch  . 
						

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203 paper jam
If paper is jammed under the rollers near the fuser, or in the standard exit bin 203.xx Paper jam appears.
1.Grasp the paper that is visible in the standard exit bin, and pull it away from the bin.
2.Open the front door, and then open the top cover.
3.Grasp the paper on each side, and pull it out gently.
4.Close the top cover, and then close the front door.
5.Press   or touch  .
230 paper jam 
If paper is jammed between the front door and tray 1, 230.xx Paper jam appears.
1.Remove tray 1.
2.Open the front door.
3.Pull straight up to remove the jammed paper.
4.Close the front door.
5.Reinsert tray 1.
6.Press   or touch  .