Error Message: load the correct paper cassette: A4

Nothing to worry about. It just means that you have printed a page or pages that all the trays do not have the correct paper size. Say your trays all have A4 papers and you printed a PDF document (US letter size) downloaded from America. Printer prints the page, then print another page with your error message just to tell you your pages do not match the papers. This is HP PCL6 code. A Postscript printer driver will just refuse to print if page size mismatches and keep the user wondering why.

To avoid the message, just make sure that your documents have the same page settings as papers in your printer trays.

I talked to tech support at Canon, and he explained that the document I was trying to print was originally scanned with an A4 paper size, and my printed is set to Letter paper size, thus producing the error code. A simple solution is to "uncheck" the box that says "choose paper source by PDF page size". It worked!!

try to remove the paper case and clean inside specially sensors. then try to print again.

Mr Stephen You have to check paper settings at 3 places first that you are putting correct paper size in correct tray and the paper supporter is touching the paper. Secondly your documents page setup paper size. Finally go to printer properties and under paper selection you will find letter size change it to a4 Thankyou for using free solutions at yafix-ratings from your side would be appriciated.

I had the same cr@p of the problem yesterday. The problem was not inthe paper. You have to do 2 simple things, from which one will solvethe problem.
first, download the latest drivers and install them.
And the more important thing, the problem occurred due to incorrectpaper format. Solution is very simple. Open MS word or somethingsimilar, file->print.. and before you print open Properties menu.There for the Output Size will be selected "Match Page Size". you don'twant that (i don't know why it doesn't work), but the solution ismanually select A4, or whatever your page size is.
And there it is... printer starts throwing pages out like crazy :)))

I had the same cr@p of the problem yesterday. The problem was not in the paper. You have to do 2 simple things, from which one will solve the problem.
first, download the latest drivers and install them.
And the more important thing, the problem occurred due to incorrect paper format. Solution is very simple. Open MS word or something similar, file->print.. and before you print open Properties menu. There for the Output Size will be selected "Match Page Size". you don't want that (i don't know why it doesn't work), but the solution is manually select A4, or whatever your page size is.

Make sure that the paper size set on the machine matches the paper that you have in the cassette. Also make sure that the sender is not sending legal-size documents if you are using standard size paper.

Is the machine giving any type of error message or code when the error light comes on?

Go in (win xp)
control panel
printers and fax
right click on the printer giving problems
click on properties (down the list)
click on printing preferences
on page size, switch from A4 to letter
click OK

Have a nice day

I think I solved my printer problem: Chang the paper size to LTR in the printer panel. then go to compter printer setup and choose printing preferences and choose page setup and chang the paper size to Letter (LTR) also. hope this is helpful.

I had same thing happen after a fresh Windows install. It was hard to figure out since it had been working fine until then, but luckily it is simple to fix. Open the Start Menu > Settings > Printers and Faxes folder. Then right-click on the Canon MF4100 Series printer and choose Printing Preferences. In there, change the Paper Size to Letter (instead of A4). You may also have to do this in the Print setup for whatever program you're using to print.