Random Bold print after printout

[rootleet203]

We have HP LaserJet MFP M129-M134, and i changed the catridge, after that, anytime we make a print out, it prints bold randomly. I want to know what is the issue and how to fix it

[KrazyToad]

@rootleet203

Welcome to HP Community

I have gone through your Post and would like to help
 

Please uninstall the printer software from root level and download the full feature software and the Firmware

1.) In Windows, search for and open Programs and features 
2.) Select your HP Printer 
3.) Select Uninstall 
4.) In Windows, search for and open Devices and printers 
5.) In the Devices and Printers windows look for your HP printer. If you see it listed right-click on it and choose ‘Delete’ or ‘Remove Device’ 
6.) Open up the run command with the “Windows key + R” key combo.
7.) Type printui.exe /s and click Ok. (Note: there is a space in between “printui.exe” and “/s”) 
8.) Click on the “Drivers” tab 
9.) Look for HP Printer driver. If you see it Click on it and click Remove at the bottom 
10.) Select Ok 
11.) Select Apply and Ok on the Print Server Properties windows 
12.) Close Devices and Printers
13.) Restart the computer and download the Full Feature Software and the Firmware from Here and follow the onscreen Instructions

Keep me posted

If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.

[ALS-77]

If you can provide a picture of what it's doing, it would help a lot. 

But, given your description of the problem, I suspect that you're seeing complete lines of text that look like they are in bold. Since you just replaced the toner cartridge, I suspect the toner cartridge is defective, where it is not turning smoothly and causing the print to become slightly smeared and taller, giving it the appearance that it is bold.