Canon Pro-100 Took a tumble and now I cannot get it working properly

[x64]

You need to disassemble it further. If you want to repair your printer you have to go deeper anyway. Again I'm not with the printer so I'm going off assumptions, but it seems like it is a mechanical issue. Looking at the cycle visible in your video I'd think the motor controller is noticing that there is too much voltage required to move the printhead a certain distance (because of a mechanical issue) and halts the movement, it assumes there is some kind of jam, then finally it attempts to eject possible jammed paper (the bar that spins fast). Certainly there is no quick fix like "press this button twice" or something like that. Your in luck because it is not too difficult and someone on this forum actually made a guide to get the cover off. That would be enough to get a better idea of what is causing your issue. Then again there is no guarantee you will find the issue or that it's possible to resolve. If that is beyond your capabilities find a repair shop or some other solution thebestcpu mentioned.

 

[kdsdata]

I have experience something like the movement in the video. In my case I stopped the print-head by hand before it went back under the cover. It took a little bit of holding, because the controller kept wanting to drag the print-head sideways. Then, holding the print-head I pressed the power button to shut the printer down, then let go of the print-head and started the printer up. This seemed to have caused a sort of reset. It went through it's power up where it did readjust where the print-head should be before it went under the cover. I believe there are times when the controller gets confused regarding the positioning of the print-head.

 

[The Hat]

I believe there are times when the controller gets confused regarding the positioning of the print-head.

The print head on all the Canon printers never gets confused on the positioning of the print head on the carriageway, unless the timing strip is very dirty, that’s what this strip is for..

 

[x64]

The print head on all the Canon printers never gets confused on the positioning of the print head on the carriageway, unless the timing strip is very dirty, that’s what this strip is for..

I'm not sure what kind of linear encoder strips (Canon) printers use, but I'm almost certain they are of the incremental kind. They require an end stop to define a zero point, in the video that's what is happening at the first movement where it hits its 'end' stop twice. Additionally there's absolute encoders that report their position at any point without the need of an end stop.