Lexmark C760 Service Manual

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Paper size sensing assembly
Go to “Paper size sensing” on page 7-16  for part numbers associated with this assembly.
1.Enter Diagnostics mode. Power up the printer in Diagnostics mode (holding  Go and  Return  until 
Performing Self Test  appears.).
2.Print the Quick Test Page, if possible. Retain this sheet to verify the installation.
a.Select REGISTRATION .
b.Press Go to print the page.
3.Turn the printer off.
4.Remove the inner system board shield. See  “Inner system...

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8.Gently twist and remove the paper size sensing assembly. As shown, the assembly touches at the 
spring (D), the fingers (E), the bottom (F), and the right side (G). This also occurs when replacing the 
assembly.
Replacing the paper size sensing assembly
1.
Press on the back of the paper size sensing assembly fingers (H). 

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2.Move the assembly down to the bottom of the aligning hole. Be careful with the exposed fingers. Do not 
allow them to press against the black plastic frame.
3.Gently wiggle the entire assembly and press in and around the corner to the right.
4.Grasp the rectangular piece (J) of the paper size sensing assembly and move up and to the left until the 
screw hole (K) lines up.
5.Reinstall the ground screw, inner system board shield, waste toner container, outer system...

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4.Remove the paper size sensing board screws (A).
5.Remove the board.
Replace the new board
1.
Power up the printer in Diagnostics mode (holding  Go and  Return  until Performing Self Test  
appears.)
2.Verify the model name to make sure the correct paper size sensing board is installed.
a.Select  PRINTER SETUP  from the Diagnostics mode.
b.Select Model Name .
The model name should match the model name on the Quick Test Page or on the printer logo. If it 
does not, you...

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Pick rolls
Go to “Pick roll tires” on page 7-53  for part number.
Front roll
1.
Wipe any toner or debris from the bottom pan to avoid contaminating the pick rolls.
2.Pull the pick assembly down into the bottom pan and remove the screw.
Note:   Do not attempt to remove either the shaft or the clutch races.
Rear roll
Reach around and depress the latch on the side of the shaft and remove the roll. 
Installation notes:

Replace both rolls at the same time.
When you...

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Printhead removal and adjustments
Identifying the printheads
A color version of this sheet is available in the appendix. See“Identifying the printheads” on page A-4.
Warning: Do not loosen or remove all printheads at the same time. If all printheads are loosened or removed, 
your reference to readjust will be lost.
Notes :
Whenever a printhead is removed, it is necessary to perform the  “Printhead mechanical alignment” on 
page 4-61  and “Printhead electronic alignment”...

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Printhead mechanical alignment
Warning: Do not loosen or remove all printheads at the same time. If all printheads are loosened or removed, 
your reference to readjust will be lost.
1.Install two printhead alignment assemblies, one in the front and another in the rear (see Figure 2 and 
Figure 3), by aligning the locating pin on the printhead alignment bracket (see Figure 1) with the hole in the 
printer frame.
2.Attach the printhead alignment tool with the provided...

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3.Turn the thumbwheel (see Figure 1) until the end of the thumbwheel just touches the printhead mounting 
beam for both the front and rear alignment assemblies.
4.Remove the old printhead and install a new printhead assembly. Do not tighten the printhead screws yet. 
Note:  Make sure the right rear screw goes through the printhead spacer located at the right rear of the 
printer frame. 
5.Bias the new printhead assembly against the front and rear stops. 
6.Tighten the...

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11.Print the Printhead Mechanical Alignment Test page to determine the printhead alignment. 
Note:   To see a printhead mechanical alignment test in color page, see  “Printhead mechanical alignment test 
page” on page B-9 .
12.Loosen the printhead screws before making any adjustments to the thumbwheel.
13.Turn each thumbwheel the appropriate number of  clicks as indicated by the test page. For example, if the 
test page indicates a +10 as the misalignment, turn the...

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Rear bellcrank (cyan, magenta, yellow)
1.Power off the printer.
2.Remove the four toner cartridges and leave the front door open.
3.Remove the ITU assembly. See “ITU assembly” on page 4-44.
4.Check each of the rear bellcranks for cracks or breakage.
5.Remove the spring (A).