927.21 lexmark error

If you have replaced the engine board on your Lexmark C935 printer and are still experiencing an error 905.01, there could be a few other possible issues that may be causing the problem. Here are a few things you can try to troubleshoot the issue:

1. Check the printer's firmware: Make sure the printer's firmware is up to date. If the firmware is out of date, it can cause errors like 905.01. You can check for updates on the Lexmark website or by contacting Lexmark customer support.
2. Check for any visible issues: Inspect the printer and its components for any visible issues that may be causing the error. This can include debris or foreign objects that may have gotten stuck in the printer, or damage to the printer or its components.
3. Check for other issues: If you have checked the firmware and there are no visible issues with the printer, it is possible that there is another issue causing the error. You may need to have the printer serviced by a professional to diagnose and fix the problem.

I hope this information is helpful. If you have any further questions or need additional assistance, please don't hesitate to ask.

It seems that you have tried most of the troubleshooting steps to identify and fix the problem. But try to replace your black cartridge with a new genuine Lexmark cartridge to determine if it's a faulty cartridge issue.
You may also contact Lexmark Technical Support Center for additional assistance.

The error relates to the system board / formatter.

R.I.P = Rest in Peace

Turn off machine for 10 minutes.

If error persists follow theses steps:

1. ) If the machine is networked disconnect the cable and power cycle. If the error doesn't come back up swap the network cable, with a good one.

2.) Firmware upgrade

3.) Replace the system board

Based on my experience it's either the network cable or the system board.

The error indicates that the system board's on-board memory has failed. This usually requires a service call but you can try to turn off the printer, then turn on after 15 seconds. If the problem continues, I strongly suggest you contact Lexmark technical support or an authorized service provider for assistance. You may need to know your printer's model type and the serial number when calling for service. Thanks.

this is a software communications error and can be caused by any of the pcb's installed in the printer. start with the simms and remove the boards one at a time untill you isolate which board has caused the problem. this can be as easy to fix as cleanig dirty contacts where the board install in the inter connect board. to having to replace the board

The way that I have found to fix this problem is to replace the logic board but when you do that, this is where the NVRAM mismatch comes in. Once you change the logic you also have to change the display op panel. That is what is giving you this error. You must change logic and op panel at same time and it will not give that error.

These errors indicate an unrecoverable engine software
error. Replace the engine board is the only solution

If the lcd that you put in came from another printer instead of Lexmark, it will say that because the lcd, riser card on rip board and rip board all contain nvram that has to be matched. an lcd from Lexmark will no have any nvram data and the nvram will be copied from the other two sources upon install. The only way to get the lcd out of another machine is to get all of the above parts from the same printer at the same time.

Go to http://support.lexmark.com/printerfirmware
Locate the appropriate authorization code for your printer model from the following list and enter it:

Optra S (4059) series printers: 4059engn.
Optra T610, Optra T612, Optra T614, Optra T616 printers: optrateng.
Lexmark T520, Lexmark T522, Lexmark T620, and Lexmark T622 printers: lextengn.
Lexmark T630, Lexmark T632, Lexmark T634 printers: e551416.
Lexmark W812: eng204


We recommend you choose to save the file within a directory on your computer's hard drive.
Once it has been saved, go ahead and run the file. The downloaded files are self-extracting ZIP files. Running this file will create a set of .PJL files and a file entitled Readme.1st. The Readme.1st file also contains directions for sending the file over through a parallel connection.

Usually, at least on the Lexmark products I am most familiar with, a 950 error had occured when a printer had the systemboard replaced and the repair tech failed to update the new systemboard to reflect the correct information contained the printer's NVRAM.

From a software perspective, this should never accidently happen. Either the NVRAM on the printer is blown or the systemboard memory of the matching terms has been cleared.

Again, not a trivial endevor.

At this point, I'd suggest a service call to get the diagnostics run against the printer. You may have to replace the systemboard.

Don