Even though the power is off, if the power cord is connected there is power going through the power supply.. What you are smelling is most likely the filter capacitors getting ready to fail
Error code E000733-0000 on Canon IR 2425 indicates that there is an issue with the toner waste container. Here are the steps you can take to resolve the error:
Turn off the printer and unplug it from the power source.
Open the front cover of the printer and remove the toner waste container.
Check the waste container for any blockages or obstructions. If you find any, clean them and reinsert the waste container.
Check if the waste container is full. If it is full, replace it with a new one.
Close the front cover of the printer and plug it back into the power source.
Turn on the printer and check if the error has been resolved.
If the error persists, you may need to contact a certified technician for further assistance as it could indicate a more serious hardware issue.
The error 22552 means that the computer has lost its connections with the printer so you have to check first if the connections are right before replacing any of the machines,you may have missed something in between
Here are some actions you can take to investigate and solve the issue.
a) Double-check to make sure the toner catritdge it is inserted properly and firmly into the printer.
b)Considering that you mentioned replacing the fuser unit, make sure it was placed properly.
c) thoroughly clean the printer's inside, including the rollers and paper path.
Unfortunately, Canon does not support the Laser Shot LBP1120 under Windows 10. It was only supported through Windows 8. There are Unix drivers available here: https://www.canon-europe.com/support/consumer_products/products/printers/laser/laser_shot_lbp1120.html?type=drivers&language=en&os=windows%2010%20(32-bit) . Since the Laser Shot LBP1120 was released with Windows 98/Me, Windows 2000 and Windows XP drivers, Canon supported this printer for over 10 years. If your system has sufficient memory and virtual machine support (BIOS or UEFI), you could try using a virtual machine with Windows 7 (with appropriate license) or a supported version of Unix/Linux to run the printer. Alternatively, create a dual boot machine with one of those OS versions on the computer.
I wish that I had better news for you.
Cindy Wells
(Another alternative is to write your own driver (or find a programmer who will do that). I don't write drivers myself.)