Size mismatch first page - Konica Minolta Magicolor 2530 DL Laser Printer

Hello Emily, have you tried to get the right template form the avery site ?
They usually offer free template and even a printing software for their paper
http://www.avery.ca/avery/en_ca/Templates-%26-Software/Templates

In Windows operating system, press CTRL+P then go to page setup and adjust the page/ print size from there.

Page 113 are different reset options.

Brother IntelliFax 2840 Basic User Manual

You will have to setup the page in your word processor for the size of the envelope to be printed. You may be printing the text, setup for default paper size which generally A4 or letter size.

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.

first change the page layout setting in the document to envelop size then try to print ..... go to page layout size option the change the paper size to envelop then try to print ......

I was getting a similar blur/blob down one side of the paper (with no discernable print anywhere,) but after removing and emptying the toner collection bottle my printing returned to normal. I am still working on the size mismatch issue, which seems to be prevalent in the 2300DL population.

Initial Thoughts
The problem seems to be a fault in a paper feed sensor. This would explain the size mismatch, since these sensors are how the printer detects the paper size. And, it would explain why printing starts two-thirds down the page, since these sensors are also used in timing where on the page to start printing.

However, a document passes through three software applications before it actually prints. And, any one of them could be causing the paper size mismatch.

Insight
Although paper sensors are usually low-tech and easy to remedy, they are often difficult to find and can sometimes be difficult to get to. Most such sensors are simple switches (toggles) and others are optical sensors that work like the electric eye of a garage door opening system. And, the solution may be as simple as a tiny piece of paper stuck on one of them. However, sensors such as these are quite numerous on this printer and can be hidden anywhere.

The three software applications I referred to are:

1. The document rendering application, such as Adobe Reader, Microsoft Word, etc.

2. The print writer. This is part of the device driver software package. It breaks up a print request and converts it to a standard format that the printer will always recognize and manages transmission of each page to the system spooler or directly to the printer.

3. The printer firmware. I'm not sure of everything this does related to the print stream. But, part of it must manage resources, such as ensuring the right size paper is being fed.

pleas check the driver settings, maybe there is a setting fit to paper or something.

mismatch occurs when printer paper settings and document page size are not the same, check document page size.check print driver settings.