Troubleshooting Lexmark 4069 Fusers – Part 1


In my previous post I wrote about Lexmark T-Series fusers in general. Now I’ll get more specific. In this post I’ll try to provide some, hopefully interesting, observances about individual model idiosyncrasies, challenges and opportunities.

Remember, I’m not trying to tell anybody how to troubleshoot. Nor am I claiming that all the information contained here is gospel. This is just some stuff I’ve noticed, experienced and talked with other techs about over the years. It’s information that’s worked for me. I hope it works for you.

At the outset I’d like to say that Lexmark fusers are ‘complicated simplicity’. I said in the last post that Lexmark hasn’t changed much of the basic design since the Optra S. That’s the ‘simplicity’. The ‘complicated’ enters the picture with the number of little variations within each model according the Type Number.

Let’s begin our fuser journey with the Lexmark T61x.  Continue Reading

Tips and Tricks for Troubleshooting and Installing Lexmark T Series Fusers


Information is the Key

It’s important to be familiar with each model of Lexmark printer that you maintain or repair. Study and compare the fuser drawings and you’ll find many of the design elements are the same. However, differences in print speed require different lamps, backup (pressure) roller sizes, heat roller construction, thermal fuses, and thermisters. And although the lamp contact assemblies are basically the same, their installation can vary widely. Notice also that some fuser elements vary within a given model according to the Printer Type Number (last 3 digits after the engine number found inside the front cover). These differences are important for image quality, and therefore, customer satisfaction. If there’s enough design deviation the result will be a 920 series Service Error Code. If not, the result will be service calls to adjust paper and fuser settings, dissatisfied customers and a shortened fuser life.

Lexmark Service Bulletins are an excellent source of information. For example, Bulletin #T65x 114 has good information on accordion type jams inside the fuser. I’ve included the section “Changing the type of fuser unit installed (T65x and X65x Series printers only) below. If you’re an Authorized Service Provider (ASP) Lexmark will email service bulletins to you directly. If you’re not an ASP they are available, on a limited basis, at the “Support/Download” part of Lexmark’s website. Also, check this blog and others like it, these experts should have this stuff memorized.

The following paragraphs are intended for your information.

They contain little things I’ve learned over the years on the job and from other techs. There is no intention, implied or otherwise, to try to tell anyone how to troubleshoot or repair any printer. I think there is some good information that worked for me at one time or another and hopefully it’ll work for you.  Continue Reading

Lexmark T650, T652 or T654 printer’s operator panel displaying a language other than English


If your Lexmark T650, T652 or T654 printer’s operator panel is displaying a language other than English and you want it to display in English, follow these steps: 

Press the Menu button.
Press Down button 4 times.
Press Select/Check button 4 times.
Scroll down and look for “English” option

T52x ‘Network 54 Error’ and how to solve it.


A “Network 54 Error” is reported by the printer at power on, or the printer loses or changes its network settings over time. Affected units may experience one or both of these symptoms intermittently.

How to cure this issue:

  1. Update the failing adapter/printer’s firmware to level 3.20.30 or higher.
    • The firmware can be found on the Lexmark web site in the Firmware section of the Drivers and Downloads page. The download contains the file necessary to update the network firmware as well as a Readme file with detailed instructions for updating the firmware. In addition to the instructions in the Readme file it is also possible to update the firmware using the printer’s web page. Follow these steps to update using the web page:
      • Open a web browser.
      • Enter the IP address of the printer in the address field.
      • This will bring the printer’s web page.
      • Click on the “Configuration” link on the left-hand side of the page.
      • Click on the “Update Print Server Firmware” link.
      • Click on the “Browse” button and locate the firmware file that was downloaded. Note that this file will have a “.psw” extension.
      • Click on the Submit button.
      • When the process is completed, the adapter will reset.
  2. If the printer continues to have problems it may be necessary to reset the NVRAM using the instructions below:
    • Power the printer off.
    • Hold down the > Menu, Select and Go buttons on the printer’s operator panel.
    • Power the printer back on while holding down the buttons.
    • Continue holding the buttons until you see “Performing Self Test / Restoring Factory Defaults” on the display. Then release the buttons.
    • The NVRAM has now been reset.
  3. It may also be necessary to manually set the MAC speed on the printer if there continues to be problems.
  4. If problems persist after performing the above steps or it is not possible to update the printer firmware then it may be necessary to physically replace the adapter or system board.
  5. Contact your next level of support if you have difficulty with these steps.

It is recommended that anyone with the affected products should update to the 3.20.30 level of code immediately. If an affected print server cannot be updated via the network or parallel port, then the print server will have to be replaced.

You don’t have to be Tony Stark to reset those Optra S & T printers.


Here’s a couple pointers on quick button resets for the the Optra T & S machines: (excluding the T640)

– If the printer is stuck in DEMO mode, hold down the STOP and SELECT buttons upon power up.
– To get the printer in DIAGNOSTIC mode, hold down the GO and RETURN buttons upon power up.

Problem (T64X): Most or all of the page is covered with toner, the pages come out mostly black/gray


Solution: First try another toner cartridge. In most cases, a defective toner cartridge will be the cause of this type of print quality issue. If the issue occurs with more than one toner cartridge, check the printhead cables. Make sure the video cable on the printhead/laser cable assembly is not damaged. If the video cable is damaged, replace the laser cable assembly (part number 40X0061).