Msg alarm blinking with check printer msg and ##324

I'm not that familiar with your model, however, the ##324 error is a scanner failure. On some of the Canon models, there is a provision in the menu for re-calibrating the scanner. You try this but I can't guarantee it will fix your problem. If I'm thinking right, your model corresponds to the Hp LaserJet 3100 series (but then again, why should I start thinking right now?). They where notorious for that problem. You'll need a blank sheet of white paper, look through the menu to find "calibrate scanner". I'm still trying to find more information on this, but I don't have it yet Hope it helps Ed