My Canon MP 520 now will print only on A5 paper but not A4. My computer setup has not changed.

Sounds like you are trying to convince the machine to print a document on to paper half the size required without telling the machine to reduce or scale the document to fit the target paper

I suspect you have sent the job to the MP ray and it wants you to put paper in it. Cancel the job and go back into the driver and make sure paper source is set to the cassette.

The paper you have inserted into the printer, and your page size settings have to match. You can't load A4 paper and tell it to print A5 size. This is why it is printing so small on the A4 paper. It assumes you need to trim it down to A5 size after printing.

I thought maybe you have the paper size set to Landscape rather than Portrait. If not, then you might look at:

http://usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_mp_series/pixma_mp240#ServiceAndSupport

I did some searching on that site and it yielded the hlep below which may give you some help.


Issue: How do I set my printer so my printout fits the paper size I am using?
Solution: Use the recommended Print Area MP240

Printing Area To ensure the best print quality, the machine allows a margin along each edge of media. The actual printable area will be the area inside these margins.
Recommended printing area (dark blue):
Canon recommends that you print within this area. ()
Printable area (light blue):
The area where it is possible to print. ()
However, printing in this area can affect the print quality or the paper feed precision.

Note
Borderless Printing
By selecting the Borderless Printing option, you can make prints with no margins.
When performing Borderless Printing, slight cropping may occur at the edges since the printed image is enlarged to fill the whole page.
For Borderless Printing, use the following paper.
- Glossy Photo Paper "Everyday Use" GP-501
- Photo Paper Glossy GP-502
- Photo Paper Plus Semi-Gloss SG-201
- Photo Paper Pro Platinum PT-101
- Photo Paper Plus Glossy II PP-201
-Photo Paper Pro II PR-201
- Matte Photo Paper MP-101
Performing Borderless Printing on any other type of paper may substantially reduce printing quality and/or result in printouts with altered color hues.
Borderless Printing on plain paper may result in printouts with reduced quality. Use them only for test printing. You can perform Borderless Printing on plain paper only when printing from your computer.
Depending on the type of paper, Borderless Printing may reduce the print quality at the top and bottom edges of the paper or cause these parts to become smudged.
See A5, A4, B5, 4" x 6", 4" x 8", 5" x 7", 8" x 10", Wide.
See Letter, Legal.
See Envelopes.
A5, A4, B5, 4" x 6", 4" x 8", 5" x 7", 8" x 10", Wide
Size
Printable Area (width x height)
A5*
5.56 x 7.95 inches / 141.2 x 202.0 mm
A4
8.00 x 11.38 inches / 203.2 x 289.0 mm
B5*
6.90 x 9.80 inches / 175.2 x 249.0 mm
4" x 6" / 10 x 15 cm
3.73 x 5.69 inches / 94.8 x 144.4 mm
4" x 8" / 10 x 20 cm*
3.73 x 7.69 inches / 94.8 x 195.2 mm
5" x 7" / 13 x 18 cm*
4.73 x 6.69 inches / 120.2 x 169.8 mm
8" x 10" / 20 x 25 cm*
7.73 x 9.69 inches / 196.4 x 246.0 mm
Wide*
3.73 x 6.80 inches / 94.8 x 172.6 mm

* This page size can be used only when printing from your computer.
Recommended printing area
Printable area
Letter, Legal
Size
Printable Area (width x height)
Letter
8.00 x 10.69 inches / 203.2 x 271.4 mm
Legal*
8.00 x 13.69 inches / 203.2 x 347.6 mm

* This page size can be used only when printing from your computer.
Recommended printing area
Printable area

Envelopes
Size
Printable Area (width x height)
European DL*
4.06 x 7.12 inches / 103.2 x 180.8 mm
US Comm. Env. #10*
3.86 x 7.96 inches / 98.0 x 202.1 mm

* Envelopes can be used only when printing from your computer.

Recommended printing area

The printer may have a setup for a region which will change the paper size. Also the paper tray may need to have the paper size adjusted on it physically. Save the paper size in the preferences to A4.

paper guide was set at A5, then this allowed menu to change feed tray selection

you'll have to clean the printer head. It's possible that your driver can do it automatically. It happens after a long time whitout using the printer. The ink can become dry and solid.

Hi,
Click on the File tab which is present in top left corner of the file, Click on Page Setup, a separate window appears, there on paper menu you can see a Size which is a drop down box. Drop down the size and select A5 and press ok. Now onwards it prints in A5 size. Later you can change it any size. Thank you........

will not pick up envelopes to print

This machine will only print certain sizes as borderless. A5 is not one of them. You can use the following media with this feature: Matte Paper - Heavyweight: A4, Letter Premium Glossy Photo Paper:A4, Letter, 5 x 7", 10 x 15 cm/4 x 6", 8 x 10" Photo Paper:A4 Premium Semigloss Photo Paper:A4, Letter, 10 x 15 cm/4 x 6" Glossy Photo Paper:Letter, 10 x 15 cm/4 x 6" As you can see A5 is not in the list, therefor you will not be able to print A5 borderless via the normal means.