Canon DR-2020U Troubleshooting, Common Problems and Solutions, Problem, Problem, Problem 6 Pages are missing, The scanner will not turn on, The scanner is not recognized

Troubleshooting

This section describes the problems that may occur while using the scanner and how to resolve them.

It you cannot resolve a problem, contact your local authorized Canon dealer or your service representative.

Common Problems and Solutions

Problem 1	The scanner will not turn on.
Solutions	(1)	Confirm that the power switch is set correctly.
	(2)	Confirm that the AC adapter is plugged firmly into a
		power outlet.
Problem 2	The scanner is not recognized.
Solutions	(1)	Confirm that the scanner is properly connected to
		the computer with a USB cable.

(2)Confirm that the scanner is turned on. See “Problem

1The scanner will not turn on.”.

(3)The computer’s USB interface may not support the scanner. The scanner cannot be guaranteed to work with all USB interfaces.

(4)Confirm that the supplied USB cable is used to connect the scanner to the computer. The scanner cannot be guaranteed to work with all available USB cables.

(5)If the scanner is connected to the computer via a USB hub, try removing the hub and connecting directly to the computer.

(6)Disconnect the USB cable, and connect it again.

Problem 3 Documents feed askew (scanned images are slanted).

Solutions	(1)	Align the document guides to fit the documents as
		closely as possible, and load the documents so that
		they feed straightly.
	(2)	Enable the [Deskew] scanner driver setting.
	(3)	If many pages have been scanned since roller
		cleaning, clean the rollers. If documents still feed
		askew, roller replacement or other maintenance

may be needed. Refer to the page 32 for roller cleaning and replacement procedures.

Problem 4 Both sides are not scanned even when the Duplex

	scanner driver setting is enabled.
Solutions	In CaptureOnTouch or CapturePerfect 3.0, executing a
	job for which single-sided (simplex) scanning is
	registered will always result in simplex scanning,
	regardless of scanner driver settings. For example, if
	[Simplex] is selected under the [Scanner setting] tab of
	the [Job Register] dialog box in CaptureOnTouch,
	scanning will always be single-sided for that job. Even if
	you configure scanner driver settings from [Scan Batch
	to File] under the [Scan] menu in CapturePerfect 3.0, a
	job will always be performed according to its registered
	settings. To perform duplex scanning, either change the
	job setting or create another job for duplex scanning.

Problem 5 If white lines or streaks appear in scanned images.

Solutions	Clean both sides of the scanner glass, and the rollers
	(both rubber and metal). If a sticky substance such as
	glue or correction fluid is found, carefully wipe with just
	enough pressure to clean the area where the lines
	appear. If the problem cannot be solved by cleaning, the
	internal glass may be scratched. Contact your local
	authorized Canon dealer.
Problem 6 Pages are missing.
Solutions	When the scanner driver’s [Scanning Side] setting is
	[Skip Blank Page], documents with very little black may
	be unintentionally skipped. Select another scan mode
	setting such as [Simplex] or [Duplex], or decrease the
	[Ratio of black pixels]. If pages are skipped due to the
	document double feeding, see “Problem 7 Documents
	jam (or double-feed).”.
Problem 7 Documents jam (or double-feed).
Solutions	(1) Clean the feed rollers if necessary.
	(2) Proper scanning may not be possible when
	document pages stick together due to static
	electricity. Fan the documents before you load them.

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