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.

 

[samboy]

Ok, so I managed to get the top cover off. First thing I noticed was the ring off the spindle in the picture attached.

 

[thebestcpu]

Well, that's a big clue
Look for the part holding the disk on it might not be the same as the one on the left, yet I bet it was some metal part that hold it in (snap ring at least). Here is an image from the disassemble post elsewhere on this forum showing what should be there. Such a metal piece would could be part of the problem depending on where it ended up.
John Wheeler

 

[thebestcpu]

And here is a more clear picture from another Canon similar printer:

 

[samboy]

It seems like it just has sticky stuff holding it on. I put it back on and had to bend the little boot that it spins through 2nd picture.

 

[samboy]

Ok, so I put it over my head and shook and could hear any loose parts. Should I give it a once over with compressed air? Should I glue that plastic wheel onto the axel? It sticks pretty well. I'm sure I didn't get the boot to line up perfectly, but hopefully it's close enough to do it's job whatever that may be.

 

[thebestcpu]

That's all above my pay grade. From an engineering standpoint, I believe it is a must that the disk is secure and stable relative to the axle upon which it spins. I would also guess this mechanism has to do with the paper positioning as it is pulled through the printer, and its accuracy could be critical to a good print. That brings up the question of the damage to the disk. That could interfere with the machine's proper recongizing of the paper position. You might be faced with finding a replacement disk without the damage..
You don't have much to lose in moving forward. Someone else who has done similar work on a Canon Pro-100 might be able to give much better information about how the disk is secured on a working printer.

Fingers crossed for you.
John Wheeler