How to resolve 'ILL EXT BUS ACC*' error on Printronix Printer?
- BBrianna RussellSep 2, 2025
The 'ILL EXT BUS ACC*' message on your Printronix Printer indicates a firmware error on the controller board. Cycle power and run the print job again. If the message persists, download the emulation software again. If the message continues, replace the controller board.












