Error message that says turn power off and on again. I do that and the same error message keeps appearing.

buy a new 1 that error code means it needs to be rebelt

Dear
Resetting the waste ink absorber on a Canon printer can resolve some error codes that appear when turning it on.

1. Make sure the printer is turned off.
2. Press and hold the Resume button (triangle inside a circle).
3. Whilst it is held down, hold down the Power button. The green led light should come on.
4. Keep the Power button held down. Release the Resume button and then press it twice. The light should go amber, then green again.
5. Release the Power button.
6. Press the Resume button four times and then press the Power button straight after to confirm the selected action (Reset Counter Absorber).
7. Turn off the printer and then turn it on again

Thanks.

Where does this "system error" message appear? On your printer display or on your computer screen? Try to remove the sheets of paper from the feeder. Open the printer cover and remove the cartridges. Close the cover. Unplug and replug the printer into the power outlet to reset itself. When the printer turns on, reinsert the cartridges. Then load some paper. Try to print again and see if the error appears again.

After turn the main switch off and on the error appears again????
This error means that there is a bad comunication between the controller board and the operation panel.
Did you intervew in the machine? Some tecnical intervewing?

this problem due to your horizontal motor gear has crack and need to replace(location at upper pick up unit)

From the service manual, both errors relate to the scanner unit:

[5012] An error occurred in the scanner FB motor.
(1) Cable connection (2) Part replacement: - Scanner unit

[5050] The AFE was faulty.
(1) Cable connection (2) Part replacement: - Scanner unit

I don't know if the following YouTube video will help, but you could watch and see if it applies to your printer.

Error 5011 and 5012 Printer Canon MG 2570 MP 237 MP258

900 Service RIP errors are usually a firmware failure. Upgrade to the latest firmware from Lexmark. This link is for the C52X network model:

http://downloads.lexmark.com/perl/downloads/downloads.cgi

I would start by looking at all of the push buttons on the camera. One may be stuck down.

how to reduce the baud rate in all in one printer

my camera did the same thing, lens retracts 3 or 4 times, and then proceeded with an error message "turn off and on again". I pressed the power button probably about 10 times, didn't work, so then i gave it a good smack on the top of the frame a few times while repeatedly pressing the power button and it did the trick. Hasn't gave me problems since...hope it helps