Plotters
Base currently owns two HP T520 plotters: Richard, a 36" printer, and Isaac, a 24" printer. Both are owned and managed by Filip.
Printing
Richard should show up automatically when trying to print (if using Windows or Linux with CUPS and Avahi). If not, try manually adding IP 10.48.1.84. Richard has a management webpage.
There may be a problem that the plotter doesn't receive the correct dimensions of the image, and defaults to printing only the bottom right A4 area. if this happens, make sure that you are sending the print job with the correct paper size.
For larger print jobs, using Scribus on Linux is recommended. Simply create a new project with the desired paper size, drag in an image, in the Image Properties tab on the right select your wanted DPI., double click it to set the file, right click Image > Adjust frame to image to scale up the image. To print, export it to PDF, open it in your operating system's print menu, set the correct paper size, and print.
Details
Richard
Richard used to belong to Base, but after a deal and fixing it, it now belongs to Filip.
Issac
Isaac has been purchased by Filip for spare parts, he did not have a motherboard (previous owner sent it to HP and never got it back), and was used for repair or Richard.
F to pay respects.
Repair
Before trying any repair on your own, contact Filip for guidance. It's HP.
After being crowned Certified HP-authorized personnel, Filip managed to obtain a service manual[1]. If it wants some code for resetting, it's there.