Regarding Canon MX922 printer. Videos explain and demonstrate how to remove the printer head. It appears to be quite simple. When I attempt removal following their directions, I cannot budge it. Help.

When the message "5100 / 5101 Printer error has occurred. Turn off power then back on again. If problem persists, see the manual." is displayed, the behavior of the print head holder is interrupted.
Do you see a jammed paper or foreign material?
Did you install the print head properly?
Please see the following for detail.
If the problem persists, contact the service center for repair. Cause 1. Is there a securing material for the holder inside the printer? Summary There may be a securing material for the holder inside the printer.
(This material must be removed before using the printer.)
Open the Top Cover, then remove the securing material for the holder. See Also Cause Summary [ With the securing material ]
[ Remove the securing material ]
Then, close the cover, and turn ON the printer again. See Also Cause 2. Is there a jammed paper or foreign material inside the printer? Summary Stop printing, then push the power button of the printer to turn OFF the printer.
Open the Top Cover of the printer; then,

• If there is a jammed paper or foreign material inside the printer, remove them.

See Also Cause Summary [ The printer with the Top Cover opened ]
( Paper jam )
After checking the above items, push the power button to turn ON the printer again.

CAUTION
When removing the jammed paper or foreign material, take extra care so that you do not touch the inner parts. Or, it may cause another printing problem.

See Also Cause 3. Is the ink tank properly installed? Summary If the ink tank is not properly installed, it interferes with the operation of the print head.
See the following images to get an idea of proper print head position. See Also Cause Summary [ When the ink tanks are not properly installed ]
The ink tank is not set firmly.
The ink lamp is not turned ON. See Also Cause Summary [ When the ink tanks are properly installed ]
The ink lamps are turned ON.

CAUTION
Always remember "Do not touch the Print Head Holder while it is moving."
Wait until the Print Head Holder automatically stops.
Do not even attempt to stop/move the Print Head Holder by holding it.

Canon PIXMA MX922

Hi George!
Are using Genuine Canon Ink & Paper?
Here are some links to your printer troubleshooting videos etc.
Canon Support Drivers PIXMA MX922
Canon Support Drivers PIXMA MX922

Go to the Canon site here and download MX920:
Canon Support Drivers PIXMA MX922

Canon Support Drivers PIXMA MX922

Canon Support Drivers PIXMA MX922

Try turning off both the computer AND the printer. When it restarts, the two will reset and recheck and communicate.

Depends on if you have it set up correctly for proper port config. Is it set up for USB or LPT? Check it out with PRINTERS showing printer details on driver etc.

It is likely that the print-head temperature sensor is detecting an over heat. If that is the case, start thinking about a replacement machine as the printheads are expensive to replace.

hOW TO Brother DCp j125 Ink Absorber Full

Issue: ERROR: Error code 5200 appears on the computer screen
Solution: The IP2700 may require repair

Unfortunately, the issue you describe seems to indicate that your product requires repair service. If you feel your product might require service, a Technical Support Representative will be happy to answer any questions you may have and explain the service options available to you. You can contact Canon through their email link or phone numbers listed on their website: http://www.canon.ca/inetCA/products?m=gp&pid=1262

Although it does not say it in the explanation it is possible your ink pad has reached capacity and requires replacement by a technician. If you wish to attempt changing the ink pad yourself there are some video demonstrations on You-Tube for canon printers. Here is one link but there are similar videos that you may wish to view before attempting. Trust this is helpful. Don't forget to vote.