Canon P-150 - Manual (Page 20)

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Problem 5 Documents fed askew are causing scanned images to be slanted.
Solutions (1) Align the document guides to fit the documents as closely as possible, and place the documents so that they feed in straight.
(2) Enable [Deskew] in the settings of the scanner driver.
(3) If many pages have been scanned since the last roller cleaning, clean the rollers and separation pad. If documents still feed
askew, roller replacement or other maintenance may be needed. For details on roller cleaning and replacement procedures, refer
to the User Manual.
(4) Perfectly straight scanning may not be possible for the document due to the structural design of the scanner.
Problem 6 Documents jam or double-feed.
Solutions Proper scanning may not be possible when the document pages stick together due to static electricity. Fan the documents before
you place them into the scanner.
Problem 7 The scanner makes unusual noise while feeding documents.
Solutions The paper quality of some documents can result in unusual noises, but this does not indicate a malfunction.
For more information, see the following:
User Manual (PDF electronic manual) Help (CaptureOnTouch, ISIS/TWAIN driver)
This is the operating manual for the scanner. The manual is stored as
a PDF file on the Setup disc, and copied to your computer during
installation. (You can also open the PDF file directly from the Setup
disc.) Click the [Help] button whenever it appears in CaptureOnTouch or the
scanner driver settings screen, and view an explanation for the screen
being displayed.