I have an old BJC-80-belonged

If you press the 'resume' button until it beeps twice the printer will enter a print head cleaning cycle. Do this 5 times if the printer has not been used for awhile. This is a great little printer designed for laptop use on the road. I really miss mine. Here is a link for the manual which shows you how to do maintenance on or offline. The ink is cheap for this model as you can change just the tank or the tank and the printhead. The only difficult maintenance is when the 'ink pad' which is at the bottom of the printer gets full usually requiring a service tech facility. Good luck -it is a joy when maintained:) http://www.precision.com/manuals/Canon_BJC80_Manual.pdf
Steve Medley ps: pressing the resume and power button together will print a test page.

try changing the cart.