Lexmark X940e Owners Manual

Diagnostic information2-225
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Tray 3 media type mismatch error
3Check the sensor (transparency detect) for proper 
operation.
1. Enter the Diagnostics Menu.
2. Touch BASE SENSOR TESTS.
3. Touch Media path.
4. Touch Transparency detect
Does the display on the operator panel, change every time 
the sensing area of the above sensor is interrupted or 
blocked?Go to step 5. Go to step 4.
4Check the sensor (transparency detect) for proper 
connection.
Is the above component properly...

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Tray 4 media type mismatch error
3Check the sensor (transparency detect) for proper 
operation.
1. Enter the Diagnostics Menu.
2. Touch BASE SENSOR TESTS.
3. Touch Media path.
4. Touch Transparency detect
Does the display on the operator panel, change every time 
the sensing area of the above sensor is interrupted or 
blocked?Go to step 5. Go to step 4.
4Check the sensor (transparency detect) for proper 
connection.
Is the above component properly...

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3Check the sensor (transparency detect) for proper 
operation.
1. Enter the Diagnostics Menu.
2. Touch BASE SENSOR TESTS.
3. Touch Media path.
4. Touch Transparency detect
Does the display on the operator panel, change every time 
the sensing area of the above sensor is interrupted or 
blocked?Go to step 5. Go to step 4.
4Check the sensor (transparency detect) for proper 
connection.
Is the above component properly connected?Replace the 
sensor...

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Image quality trouble
Printer Related Troubleshooting
Note:  First, get a printout as a base, and follow the symptom table to identify the possible failing FRU’s. 
Image quality symptoms 
•
Faint print (low contrast)— “Faint print (Low contrast)” on page 2-229.
•Blank print (no print)— “Blank print (no print)” on page 2-231.
•Solid black— “Solid black” on page 2-233.
•Vertical blank lines (White stripes in media transport direction)— “Vertical lines and...

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Image Quality 
Faint print (Low contrast)
Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path. 
Step Check Yes No
1Check the media condition.
Load new, dry, recommended media, and perform a print 
test.
Is the image density normal?Problem solved. Go to step 2.
2Check the four toner cartridges.
Re-print the defective image.
Is the image density normal?Problem solved. Replace any 
empty...

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6Check the toner add motor assembly.
Replace the toner add motor assembly.
Go to “CMYK toner add motor assembly removal” on 
page 4-103.
Does the error continue.Go to step 7. Problem solved.
7Check the developer/transfer roll HVPS card assembly. 
Replace the developer/transfer roll HVPS card assembly.
Go to “Developer / transfer roll HVPS card assembly 
removal” on page 4-112.
Perform a print test.
Does the problem remain?Go to step 8. Problem solved.
8Check...

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Blank print (no print)
Check the media path for foreign objects such as staples, clips, scraps of media.
Step Check Yes No
1Check the four toner cartridges.
Re-print the defective image.
Is the image density normal?Problem solved. Replace any 
empty toner 
cartridges.
2Check the 2nd transfer roll assembly for contamination 
and wear.
Is the 2nd transfer roll assembly free of excess wear 
and contamination?Go to step 3. Replace the 2nd 
transfer roll...

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7Check the printhead assembly installation. 
Install the printhead assembly properly, and perform a 
print test.
Does the problem remain?Go to step 8. Problem solved.
8Check the printhead assembly for connection.
Is the above component properly connected?Go to step 9. Replace the 
connection.
9Check the developer/transfer roll HVPS card assembly. 
Replace the developer/transfer roll HVPS card 
assembly.
Go to “Developer / transfer roll HVPS card assembly...

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Solid black
Check the media path for foreign objects such as staples, clips, scraps of media. 
Step Check Yes No
1Check the four PC cartridges for proper installation.
Check the PC cartridge connections.
Are the PC cartridge connections free of excess wear 
and contamination?Go to step 2. Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
2Check the charge roll HVPS card assembly connections
Is the above...

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Vertical lines and bands (process direction)
Step Check Yes No
1Check the media condition.
Load new, dry, recommended media.
Re-print the defective image.
Does the error continue?Go to step 2. Problem solved.
2Is the media transfer route and the media path clear of 
debris?Go to step 3. Remove debris or 
contamination.
3Check the laser beam route.
Check for debris between the printhead assembly and the 
PC drum.
Check the four printhead assembly windows for...