When I print my letter, I set my defaults on my computer with Letter size. But pn the printer, I can't figure out how to change the cassette from A4 to letter. It's driving me crazy. Please help me default from A4 to Letter.

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!!

Don't set by using the "Print" option.
Go to [Start]
[Printers and Faxes]
right-click on the HP Printer entry
! Don't select "Printing Preferences"! from there
Select [properties]
Select [Advanced] tab
Select [Printing Defaults]
[Advanced}
(I know, the screen looks the same, but it functions differently this way)
Change paper size to "Letter"
[OK, OK, OK]
*done*

Don't set by using the "Print" option.
Go to [Start]
[Printers and Faxes]
right-click on the HP printer entry
! Don't select "Printing Preferences"! from there
Select [properties]
Select [Advanced] tab
Select [Printing Defaults]
[Advanced}
(I know, the screen looks the same, but it functions differently this way)
Change paper size to "Letter"
[OK, OK, OK]
*done*

Hi Tricia,

Are you using a different page size (letter) as A4 and A4 is chosen as default?
You can change it from Start - Printers and Faxes (Win XP). Then right click your pinter icon and choose Propeties.
There check Printing Preferences and Divice settings. Settings can also be wrong in the program you are using.
Check File - Page setup there.
also check the settings on the printer - override letter with a4

Hi there this issue is caused by your driver defaulting to letter and a4 paper being used set your default paper size to a4 in the driver and also set tray to a4 this should cure the problem Regards AL "alstech"

A lot of users have no idea how to change the MS Office default from US to UK .. so they have US spellings and US paper sizes (known as 'Letter' sized) .. and (of course) any Document that started life in USA keeps it's size until some-one changes it ... since Letter size is almost the same as A4 no-one cares UNTIL they come to print it ...

I'm sure you can guess the rest :-)

Yes, the Printer is looking in it's feed tray for Letter sized paper .. yes, Letter doc's will print just fine on A4 and most printers have a setting somewhere that lets it use A4 when asked for Letter (often called "automatic A4<>Letter convert" or some such)

NB. when time permits, perhaps the unfortunate users can have their MS Office apps. set to UK mode :-)

I'm not sure if this will help, but are you printing from adobe? If the page is a little small on the pdf and you have Adobe set to "adjust paper size to fit document" the printer will keep trying to print to A4, which is smaller than letter.

If the printer itself is doing this when printing from any program than I'm not sure what is wrong.

Did you try uninstalling and reinstalling driver? Do you have the newest version of the driver, i have the same printer and I think online a May 2008 driver is available

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.

Are the print jobs being sent to printer all the same page size?

Are they all print jobs sent letter page size and your printers cassettes are set for A4 or something?

Your printer is asking for letter size paper, because any paper it has is not set to letter  and document that it is trying to print has been sent as that size.

Check what options you have on print driver on pc as far as Tray defaults, paper type and size settings

Check printer settings via its keypad as to tray defaults, paper size set for each tray and paper type, some printers have paper size switchs on their trays too.

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.