Lexmark C760 Service Manual

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3.  Diagnostic aids
This chapter explains the tests and procedures to identify printer failures and verify repairs have corrected the 
problem.
There are different test menus that can be accessed to identify problems with the printer.
Diagnostic aids
Printhead diagnostics
See “Printheads” on page 7-13  for the part number.
If you get a printhead error, follow this diagnostic to find the specific failure. 
1.Verify all the printhead cables are properly seated.
If the...

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3.Install the printhead diagnostic tool and determine the problem.
The following procedure shows the yellow and cyan switch as an example.
a.Turn off the printer.
b.Unplug the printhead cables from the system board in the printer and connect them to the printhead 
diagnostic tool.
c.Connect the printhead diagnostic tool cables to the connectors on the system board in the printer. 
This reverses the printhead color signals for the selected pair of colors. 

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d.Turn on the printer and note the new error codes.
 If an automatic calibration begins,  36 Printer Service Required may appear. The printhead and 
system board are working correctly and the printhead cable connections should be checked. 
Press  Go to clear the error.
 If the error code remains the same, replace the system board. If that solves the problem, you  are finished.
 If the printer displays a different printhead error code, which indicates another color, the...

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Print quality defect locator chart
The print quality locator chart is copied below, but the tool is a transparent sheet available with this printed book. 
Use the tables and rulers to determine the source of repeating defects.
Using the chart
Measure repeating horizontal lines from the reference lines at the top to determine what may have caused the 
lines to form in that pattern. Be sure to use portrait orientation for the test file.
Rollers
Component...

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Printing the chart
The printer has an internal copy of the defect locator chart under the Help Menu. Verify the proper image size by 
measuring any of the marks on the chart and comparing them to the corresponding measurement in the chart. 
Use Step 2 if adjustments are needed.
Copying the chart
Use the provided transparent sheet if at all possible. If you need to make a copy, be aware that fax machines, 
digital scanners, and xerographic copiers can distort images. Charts...

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Partial Print Test
Diagnostic procedure for missing or faded planes
1.
Turn the printer off.
2.Remove all cartridges and the ITU.
3.Inspect the bellcranks.
4.Enter the Configuration Menu. See  “Configuration Menu” on page 3-8 .
5.Select Prt Quality Pgs  and press Select.
6.Open the vacuum transport belt (VTB) jam access door and watch the test pages pass from left to right 
over the VTB. 
There is a delay between the first and second page. 
7.Once the pages are printed,...

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Interpreting the results
If the developed images are not visible on one of the PC drums, the following components should be checked:
Toner cartridge - Switch cartridges to determine if the problem stays with the slot or cartridge.
Cartridge contact block pins - Verify that pins are spring loaded and properly positioned. See  “Cartridge 
contact assembly pin locations (cyan, magenta and yellow)” on page 5-4
Developer HVPS cable - Make sure that there is no damage to the...

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Configuration Menu
The Configuration Menu contains a set of menus, settings and operations which are infrequently used by a user. 
Generally, the options made available in this menu are used to configure a printer for operation.
Note:  An asterisk(*) in the value list in the following menus indicates the default value.
The following are available from the Configuration Menu: ITU Cnt Value
Fuser Cnt Value
Reset Fuser Cnt
Prt Quality Pgs  (This is not displayed if in Demo...

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ITU Count Value
This is the page count of the current ITU. It cannot be reset unless a new ITU is installed. 
Press Select  to view the count value.
Fuser Cnt Value
Enter the Configuration Menu and select  Fuser Cnt Value. 
The value can be reset in Reset Fuser Cnt.
This only displays if the Maintenance Warning and Intervention function is enabled in the printer Configuration 
ID. The fuser maintenance page counter is incremented when a page is printed and incremented by...

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SIZE SENSING
Automatic size sensing can be disabled or enabled in this menu. Only paper sources that support Auto Size 
Sensing are displayed.
1.Select SIZE SENSING  from the Config Menu.
2.Select a tray. Only those trays with size sensing display. One of the following is displayed:
Tray 1 Sensing
Tray 2 Sensing
Tray 3 Sensing
Tray 4 Sensing
3.Select  Auto to turn size sensing on for that tray, or select  Off to disable size sensing.
4.Select  Return  to exit.
Panel...