Canon pro-10s series Online Manual page 361

Set the printer not to detect the width of the paper using the Canon IJ Printer Utility.
To set the printer not to detect the width of the paper, open the Canon IJ Printer Utility, select Custom Settings
in the pop-up menu, clear the Detect paper width check box, and then click Apply.
To open the Canon IJ Printer Utility, see
* Select the Detect paper width check box again once printing is complete, and then click Apply.
Are the Media Type and the Page Size settings of the printer driver correct?
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When using non Canon genuine specialty paper, be sure to select the proper media type or page size correctly
in the printer driver.
Confirm the settings following the procedure below, and try printing again.
1. Make sure that A3 (Art Paper Margin 30), A3+ (Art Paper Margin 30), A4 (Art Paper Margin 30), US
Letter (Art Paper Margin 30), or Tabloid (Art Paper Margin 30) is selected in the application.
If the page size you want to use is not displayed, open the File menu of the application and select Print.
Then make sure that the name of your printer is selected.
2. Make sure that the paper selected for Media Type in the Print dialog in the printer driver matches the
paper loaded in the printer.
3. Make sure that the Paper Size setting in the Page Setup dialog in the printer driver is the same as the size
set in step 1.
Make sure that your printer's name is selected in the Print dialog.
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The printer will not print properly if you are using a printer driver for a different printer.
Make sure that your printer's name is selected in Printer in the Print dialog.
Note
• To make the printer the one selected by default, select the printer for Default printer.
Restart your computer if you are printing from the computer.
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Opening the Canon IJ Printer
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Utility.