Cause: Ready signal not received from main controller.
If the basic reset doesn't work, the machine may require a more formal "Error Clear" through its service data: Clear Error Codes : Access the service menu (typically by pressing the Additional Functions simultaneously, then Additional Functions again) and navigate to Clear > Error to reset the internal state. Firmware Re-flash canon ir2016 download standby error verified
Based on community consensus and service documentation, here is how to address the error: Firmware Re-flashing (Primary Fix): Required Tools: You need the Canon Service Support Tool (SST) and the correct firmware files (System and Boot ROM). Connect the printer to a PC via USB. Use the Cause: Ready signal not received from main controller
Continue holding the Stop key until the printer finishes its boot sequence, then release it. Clear Error Data via Service Mode Connect the printer to a PC via USB