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840.02 or 843.99 Scanner Error Code on a Lexmark X73x and X74x Color Laser Printer

Document ID:TE351
 
07/23/14 Properties  

Problem

843 Error; 843.xx Error; 843.99 Error; 840.02; Service Error; Scanner failure; Scanner not working; Printer not working; Printer doesn't work; Scanner doesn't work; X73x; X74x

Solution

What you will see


The MFP displays a 'Scanner Error' message. An 840.02 or 843.99 type numeric error code accompanies it.
 

  • The 843.99 error is usually caused by a dirty ADF sensor that requires cleaning and maintenance. This error may also lead to an 840.02 Scanner Disabled message.
  • This issue is usually seen on MFPs that have been installed but not used for sometime, or have a high usage count on the ADF.
  • This can also be seen on MFPs that are placed in a location not readily accessible and in which dust/contamination may collect and build up on the ADF sensor.


A service call may be required to resolve this issue. Certain rare occurrences, however, such as a power fluctuation or a static discharge in the vicinity of the MFP, can cause a false 840.02 or 843.99 error message to display. In such cases, the error is only temporary and can be easily resolved without service.

 

 

Troubleshooting steps


Perform the following steps to determine whether a service call is required:

Steps Actions
1

If this is the first time the issue has occurred and the device is currently displaying an 843.99 error, switch off the MFP's power. Leave it powered off for 30 seconds or more to clear its memory.
 

Important! Do not power the MFP off and on too quickly. Doing so can cause a power issue and create this type of issue.

2

If possible, connect the printer's power cord directly into a grounded wall outlet. Lexmark recommends that laser printers should be so connected, with no extension cord, power strip, surge protectors, or UPS. For a detailed explanation, please click here.
 

Note: This step is especially important if the error occurs intermittently. Power strips, surge protectors, extension cords and uninterrupted power supplies (UPS) can trigger false errors. This is true even if the MFP has worked previously on your surge device. Should wall-connection access be unavailable, confirm that the surge device is switched on and functioning correctly. To verify it is, you can also try plugging another device (a light or a fan) into the same outlet.

3

Power on the machine and observe the operation.
Did the error message return?
 

Yes: Proceed with the steps below.
No: If the MFP powers up to the Ready screen, try printing. Should the MFP now print correctly, continue normal use. Pay close attention to the printer over the next few days, however, to see whether the issue returns.
 

4 If the 843.99 error re-appears again, please switch off power to the MFP.
5

Open the ADF front cover (Image 1) and remove the pick roller assembly (Image 2).
 

Image 1 Image 2
Click Image to Enlarge Click Image to Enlarge

 
6

Slightly dampen a soft, lint-free cloth with water. Wipe the surface of both pick rollers and replace the pick roller assembly (Image 1). Also wipe the entire surface under the ADF cover, including the two small white rollers, separator pad, and then wipe the pick pad (Image 2).
 

Image 1 Image 2
Click Image to Enlarge Click Image to Enlarge

7

Pull the flap up as shown below (Image 1), and then wipe the sensor behind it. Close the flap, and then close the ADF cover (Image 2).
 

Image 1 Image 2
Click Image to Enlarge Click Image to Enlarge


Power on the machine again. Did the error message return?


Yes:
If the issue returns, please contact Lexmark Technical Support or a local authorized service provider for additional assistance.
No: If the MFP powers up to the Ready screen, try printing. Should the MFP now print correctly, continue normal use. Pay close attention to the printer over the next few days, however, to see whether the issue returns.


Important! Clean the ADF parts regularly to maintain optimal printing performance. Residue on the ADF parts may cause print quality issues, false 290–294 paper jam messages and false 840.02 or 843.99 scanner error

 

 

Still Need Help?

If you require additional assistance, please close this window and locate  Get in Touch with Lexmark! for contact information. NOTE: When calling for support, you will be asked for your machine/model type and serial number (SN). If you need help locating these, click here.


Please be near the products described in this article to expedite the support process and reduce callbacks. 
 

 

 



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