Lexmark C760 Service Manual

Diagnostic information2-135
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Low image density
Note:  If all colors have a low image density problem set the Print Darkness to High from the user’s menu.
If only one color has a problem, go to “Step A.”
If all colors have a problem, go to “Step B.”
Step A
Step B
2Print cartridge(s) - Enter the Diagnostics Mode. 
Remove one print cartridge at a time and run a Test 
Page to isolate the faulty print cartridge.
Have you isolated the failing print cartridge? Replace the 
“Cartridge 
contact...

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Poor color alignment
Transparency print quality is poor
Step Action and questions Yes No
1 Print cartridge - Make sure that the print cartridges are 
properly inserted and are seated properly in their 
respective V blocks.
Are the cartridges seated correctly? Go to step 2 Install the 
cartridge(s) 
correctly
2Front cover and cartridge contact block - Check the 
front cover and the cartridge contact block to make 
sure that all the springs and cartridge hold downs are...

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Negative ghosting or faded image
The print has a negative ghost on the page or the image is faded, particular with text. This problem 
may happen with any color and can be mistaken as toner smudges on the page.
Residual image

If only one color has a residual image repeated every 95 mm, replace the print cartridge.
If all colors have a residual image 147 mm from the top of the page, replace the fuser assembly.
Note:   Do the following steps  before you replace...

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Toner smears or rubs off the page with no error code displayed
Note:  This type of problem is associated with improper fusing or incorrect settings for media type being used.
Smudged or distorted images on fused page
Step Action and questions Yes No
1 Media settings - Check to see if the printer is set for 
light paper.
Is the printer set for light paper? Set the printer for 
current media 
type and go to 
step 2Go to step 3
2Does resetting the media type fix the...

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Toner is on the back of the printed page
Do the following steps before proceeding with this service check:
1.Enter the Diagnostics Mode.
2.Select Print Test , Tr a y  1 , Continuous  from the menu.
3.Run at least 20 pages of text and see if the problem remains.
If toner is still on the back of the printed page, proceed with this service check.
If the problem is on the top two inches of the page replace the second transfer roll.
If the toner is “stringy” over the...

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White streak in color plane
A white streak appears in one particular color plane. This problem may be caused by a contaminated developer 
roll in the print cartridge.
Paper wrapped around the second transfer roll
Step Action and questions Yes No
1 Check to see which color is having the problem and go 
to step 2.
2If another cartridge is available, try a new cartridge for 
the color having the problem.
Do you have another cartridge to try? Go to step 3 Go to step 4.
3Does...

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Second transfer roll service check
Note:  The second transfer roll is 51.03 mm (2.009 inches) in circumference. Any print quality problems such as 
lines that are spaced apart indicate you should check the second transfer roll for damage, toner, or foreign 
material.
Note:   The second transfer roll is also part of the maintenance kit and should be replaced when a “83 ITU 
Maintenance” message appears. Ask the customer if they have replaced the second transfer roll...

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Tray 1 service check
Tray 1 does not stay seated or fit correctly in the printer, the media fails to feed correctly from tray 1 or tray 1 is 
difficult to install
The Tray 1 Feed Test in the Diagnostics Menu can be used to help isolate problems with paper feeding from Tray 
1.
7Transfer terminal contact assembly and ITU transfer 
bellcrank - Check the transfer terminal contact, transfer 
cable, and ITU transfer bellcrank assemblies to make 
sure they are installed...

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Tray 1 paper size sensing service check
The printer does not sense the size of the media installed in Tray 1.
Note:  If there is a problem when installing Tray 1, Tray 1 is difficult to remove or does not stay locked in position, 
go to  “Tray 1 service check” on page 2-142 .
Warning: Whenever the paper size sensing board is removed, customer settings in the NVRAM may be lost. 
The“Motor Detect” on page 3-17  must be performed if the NVRAM contents are lost during...

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