Hi Dan,
Thank you for using the Support Forum. First let me apologize for the issues you are having. The code you are receiving 91.720 is a Printhead Tilt fault. The solution is to power off for 20 seconds and power back on. Also check the following:
• Check for obstructions or ink spills around the Printhead and remove them.
• Verify the Printhead travels smoothly from left to right.
If you feel this machine does not meet your needs and it is less than 3 years old please consider using the Total Satisfaction Guarantee to inquire about a different machine.
If the problem continues please consider contacting your support centre for further assistance.