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Printer is not printing - keeps showing 994 service engine error - pls help

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Please click on the link http://bit.ly/rv412wto see instruction on how to go about the procedure. For further assistance, please contact LexmarkTechnical Support.

Posted on Jul 26, 2011

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1 Answer

Lexmark C510 can not print and display with 994 service engine error. How to solve this problem. Thank you very much


Please click on the link http://bit.ly/rv412w to see instruction on how to go about the procedure.


For further assistance, please contact Lexmark Technical Support.

Jun 08, 2011 | Lexmark C510 Laser Printer

1 Answer

994 service density sensor


The 994 Density Error indicates that the printer's system card has encountered an unrecoverable error. The 994 Density Error can be caused by the density sensor becoming dislodged from the sensor board. This normally requires a service call. However, for basic troubleshooting, try powering the printer off, wait ten seconds, and then power the printer back on. If still no go, if possible, connect the printer's power cord directly into a grounded wall outlet. In rare instances, a surge protector or uninterruptible power supply (UPS) can generate false error messages. If problem persists, I strongly recommend contacting your Authorized Service Provider or Lexmark Technical Support for assistance. I hope I can assist you more on this.

May 10, 2010 | Lexmark C912 Led Printer

2 Answers

C510 printer displays "994 Service Engine Error". How do you address this?


From a previous post: Posted by waynechurch on Apr 24, 2009 Is this error on a C510?, because the manual lists 994 as OPC belt marker sensor error.

Normally with an engine service error i reflash the engine firmware first, if that doesn't cure the fault i would then replace the engine board. If you need the firmware, visit the Lexmark site get the contact phone number for your region and ring them. They're normally quite helpful and of coarse can tell you how to reflash it.

Sep 25, 2009 | Lexmark C510 Laser Printer

1 Answer

C510 printer displays "994 Service Engine Error". How do you addr


Here you go, courtsey of Lexmark's Knowlwdgebase.

Don

*************************************************

994 Service Engine Error on a Lexmark C510 ID: ENUS21233 If your printer is unable to move the photodeveloper belt to the correct position during printing, a 994 error will occur. However, it may simply be the case that the photodeveloper is either contaminated with excess toner or improperly installed. To test for and resolve this issue, please do the following:

  1. Power the printer off and remove the photodeveloper cartridge.
  2. Rotate the green metallic photodeveloper belt by manually turning the white drive gear on the bottom of the cartridge until the black positioning markers are visible.
  3. If necessary, carefully wipe any excess toner powder from the positioning markers using a soft, lint-free cloth or tissue.
  4. While the top cover of the printer is still open, inspect the sensor that is used to locate the positioning markers on the belt. CAUTION! The photodeveloper is very sensitive to light. Cover the green metallic surface of the photodeveloper with a piece of paper while it is outside the printer.
    • Refer to this image, this image, and this image to identify the location of the sensor.
    • Verify that the sensor has not come loose from its housing and that it is not contaminated with excess toner powder. If necessary, clean the sensor with a soft, lint-free cloth or tissue.
  5. Re-install the photodeveloper cartridge and power the printer back on.
  6. If the error remains, it is likely that a service call will be necessary to resolve this issue. Please contact Lexmark Technical Support, having first obtained the serial number of your printer. NOTE: If practicable, attempt to order another photodeveloper and replace it first to avoid the inconvenience of a potentially unnecessary service call.

Jun 22, 2009 | Lexmark C510n Laser Printer

1 Answer

994 Service Density Sensor Error Lexmark C912 Color Laserjet


What the error means:

The 994 Density Error indicates that the printer's system card has encountered an unrecoverable error.

What to do:

This error normally requires a service call. However, on certain rare occasions, such as a power fluctuation or a stray static discharge in the vicinity of the printer, can cause a false 994 Density Error message to appear. In such cases, the error is only temporary and can be easily resolved without service. Follow the steps in the table to check.

Step Action
1 Power the printer off, wait ten seconds, and then power the printer back on.

Did the error message return?

Yes: Continue to step 2.
No: Print a test page. If the page prints, the printer is functioning correctly.

2 If possible, connect the printer's power cord directly into a grounded wall outlet. In rare instances, a surge protector or uninterruptible power supply (UPS) can generate false error messages.

Did the error message return?

Yes: Continue to 'Contacting Lexmark' below.
No: Print a test page. If the page prints, the printer is functioning correctly

Contacting Lexmark
When calling for service you will need to know your printer model type and serial number. If you need help locating this nformation, click here.
Call them while you're near the printer in case the technician asks you to perform a task involving the printer.

Jun 15, 2009 | Lexmark C912 Led Printer

2 Answers

I have a Lexmark C510 and it's giving me an engine error 994. What do i do? I need your help.


here is an excerpt from the lexmark technical tips library it could be usefull


Bulletin Summary: 994 Density Sensor Error
Document Date: Feb 03 2004
Operating System: Printer Based

Issue:
The 994 Density Sensor Error can be caused my many different things. The basis of the Error comes from the printer not being able to do the auto calibration and the auto registration when the printer is turned on. Toner Patches are written to the belt on ever Power Cycle of the printer or when ever a door or cover is opened on the printer when the Auto Color Adjust is turned on and the Auto Registration is turned on. If too much of one color is placed on the belt or there is an absence of a color or all colors the printer will call the 994 Error. This error will also be called if the activation arm for the density sensor is not pushed in. Another thing that can cause the 994 Error is if the sensor for the under the belt for the BUD Clutch positioning is the incorrect part.
Solution:
Things to Try with Customer

When the printer is powered on in Diagnostics the printer does not perform the Auto Calibration of Registration functions as would normally occur on POR. Turn the printer off and POR in Diagnostic Mode. From here print the Quality Pages under the Print Tests. These quality pages can give insight as to what is causing the 994 error.

What to Look for on the Print Quality Pages

First Look at the First Page on the Print Quality Pages. The first page tells mean things about the printer. There is a section that gives the Page Count on the printer, the Last 12 Errors, the Serial Number, Engine and Rip Code Levels. There is also a section on the first page that tells the last time the printer did the Auto Registration and Calibration. If the printer does not have 703.007 RIP on a C910 or IBM 1228 Printer this may not be displayed. Since there is only one Version of RIP on the C912 and IBM 1357's 720.013 this code will display the last time the printer was did a calibration and registration.

Second - Go through all the Quality pages are any of the color planes missing completely?
If only one color plane is missing it's possible that LED array is unplugged.

Is the top half or bottom half of one or more color planes is missing completely?
If yes then that one LED or Multiple LED's May have one Cable Unplugged.

Are all the Color pages white but the black pages printed ok?
If all the colors are missing and only black appears most likely the sensor under the Belt for the BUD Clutch position sensing is the incorrect part. This would only be the cause if that sensor was just replaced during fixing a 994 Error. Another check to do if this is the case is to look at the belt while it's in the printer. Open the Top Cover of the printer and check the right and left sides of the belt. The Belt should be raised on the right side and be equal height as the left side. The pictures below show the Belt in the Up and Down Position. If the belt is down when the printer tries to do the calibration no color will get transferred to the belt. This will cause the 994 Error. This also is why no colors would be appearing in all the planes but black is fine.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Dec 01, 2008 | Lexmark Office Equipment & Supplies

1 Answer

"981 Service Switch Error" and "994 Servise Density Sensor"


these are internal error. beyond user capability or repair
turn off the printer and check all of the cable connections.
turn on the printer, you need to call lexmark service, if the error returns.

Feb 17, 2008 | Lexmark C912 Led Printer

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