Here’s a helpful review for the Canon PIXMA TR8620 (since “F166400” appears to be a part number or misprint; the common Canon model with similar number patterns is the TR8620a or related all-in-one printers). If you confirm the exact model number, I’ll be happy to adjust.
If you are searching for the Printer Canon F166400, you likely actually own one of the following compatible printer models: printer canon f166400
Resetting the Printer: You can manually reset the device by holding the power button and pressing the stop button 5 times. Here’s a helpful review for the Canon PIXMA
So, what exactly is the Canon F166400?