Yeah me too. I did get through to a lady at Tech Support. She diagnosed problem (6004) as a broken machine. She put me in tough with sales and they sold me a TR8160 with 10% off their retail price, plus tax and free shipping. I compared it to Amazon ...
Did Canon help you with this 6004 on TS9120? I had the same issue .Fine machine and now that carriage won't position correctly it is a door stop, and I just bought all six new inks tanks!!
Same thing for me. No jams but I guess Canon wants to charge me to repair it. The same out of date printer now sells on Amazon for 8 times the price. Go figure!!