Error message 490 mismatch

Paper mismatch errors occur because the product scans the width of the envelope before printing. If the paper size setting in the printer driver does not match the paper actually loaded in the product, the product reports a 'Paper Mismatch' error. The message saves paper and ink by preventing print jobs from accidentally printing on the wrong paper. For example, the print job might be for a 101.6 x 152.4 mm (4 x 6 inch) photo, but there is letter-size paper loaded in the product. The error message displays to make sure that ink is not wasted on the wrong paper type. try this out , disable the automatic paper type sensor.

1. Open the Print dialog box.
   1. In Word 2003, click File , and then click Print
   2. In Word 2007, click the Office button ( ), and then click Print .
2. Make sure that your product is in the Name drop-down list box, and then clickProperties .
3. Click the Features or Paper/Quality tab.
4. In the Paper type drop-down list, click Plain paper .
5. Click OK to close the Properties dialog box.
6. Click OK again to print the current print job.

Have/had the same problem: Getting "paper size mismatch" on the C4280 status screen, after we got a paper jam. Every time we hit OK and put in paper, Message about "Now printing Alignment page", it feeds through quickly, with nothing printed on the page and reverts back to Paper size mismatch. Finally got rid of the error, not sure how, but now when I try to copy anything, we only get the lower right postion of the document that I'm trying to copy. Printing from the PC seems ok.
Powered off and back on, and it is back to P"now printing alignment page, quick feed through and "paper size mismatch" error. AND
When copying directly from the glass panel,it will only print a quarter of the page -however it prints and coorectly if we print directly from the computer.
The problem is the paper size sensors. Remove the plastic access panel that is for access to the rollers in the back and has 4 rollers on it. There are two papaer sensors attached to the printer circuit board (PCB). The control arm for the sensor is a small plastic piece that extends slightly into the paper path above the PCB. The plastic can be broken when you are removing a paper jam. I stuck a small piece of a match stick in the sensor to keep it open (as though a wider piece of paper was passing throught the printer). I can't switch to smaller card stock, etc, but who cares, it works.
The copying problem is caused because the C4280 will not scan correctly until after it does the alignment phase.

Hi,
Paper mismatch errors occur because the printer scans the width of the envelope before printing. If the paper size setting in the printer driver does not match the paper actually loaded in the printer, the printer reports a 'Paper size error'.
Try to adjust the printer and envolopee settings..
Regards,
polysandy

490 error means -

LOAD mmm AND PRESS ONLINE SWITCH 490: MP TRAY EMPTY

Print job from MP Tray has been received and the MP Tray is empty.

Load the requested media (mmm) in the MP Tray and press ON-LINE.

Check your print driver settings and see if your defualt try is set for the MP Tray. Also see if the page setup for the print job is set for MP tray.

I tried all of the suggestions on here and nothing worked. My envelopes are 5x7.3. So, I finally just put in 5x7 and lo and behold, even though there truly was a paper mismatch this time since that was NOT the size of the envelopes, they printed. I did have to move the text boxes some to make them print correctly. So, I guess the solution for my printer is to actually mismatch the size of the paper/envelope so that you will NOT get the "paper mismatch" error message. Will it work on other size envelopes? I have no clue. This is the first time I've ever been able to print an envelope at all with this printer that I've had 2 or 3 years.

check the Tray. there are markings on the tray that tell the printer what paper is loaded, if the tray isn't in the percise location of type of paper, you'll get that error message. If that isn't it, then check the sides of the tray and see if there is any damage. sometimes the tabs on the trays that tell the printer what paper is in it, get broken. If that isn't it, then look inside the printer where the Tray goes in, and look for damage, or bent metal feelers that rub against the tray,

Hello oyam26,
For any paper mismatch issue, first thing you do is try to set the paper type to plain. This will fix the issue in most of the cases.

gud luck

I try sending a fax then the paper goes through it makes a loud beep and the message says theres been an error try again this happens all the time no matter who I fax. then it prints out error confirmation stating Mode G3 send error

I understand that while receving faxes, you are experiencing with paper mismatch error message.

Please select the paper type as plain paper fromt the front panel of the All-in-One and try to recevie faxes.