Sharp AL-1633 Original is smudged or blotchy, You have not specified a suitable resolution

TROUBLESHOOTING

Problem	Cause and solution	Page
	The document glass or the underside of the document
	cover/SPF is dirty.	66
	→ Clean regularly.
	The original is smudged or blotchy.	–
	→ Use a clean original.
	You have not specified a suitable resolution.	–
	→ Make sure that the resolution setting in the scanner driver is
	appropriate for the original.
	You are scanning a large area (for example an entire A3)
	at high resolution.
	→ If you attempt to scan a large area at high resolution and there is
	insufficient memory in the machine to hold the scanned data,	–
	scanning will take place at a lower resolution and the scanner
	driver will enhance the data to make up for the lower resolution.
	However, the quality of the enhanced image will not be as high as
	if scanning took place at the higher resolution. Use a lower
	resolution setting, or scan a smaller area.
	You have not specified a suitable value for the "B/W
	Threshold" setting.
	→ If you are scanning with a TWAIN-compliant application and are
	using "White", "Red", "Green" or "Blue" mode from "Light Source"	–
Poor scanning quality.	menu, make sure that a suitable value is specified for the "B/W
	Threshold" setting. A larger threshold value makes your output
	darker, while a small threshold value makes it lighter. To adjust
	the threshold automatically, click the "Auto Threshold" button on
	the "Image" tab of the "Professional" screen.

The brightness and contrast settings are not suitable.

→If you are scanning with a TWAIN-compliant application and the resulting image has unsuitable brightness or contrast (for

	example it is too bright), click the "Auto Brightness/Contrast
	Adjustment" button on the "Colour" tab of the "Custom Settings"
	screen. Click the "Brightness/Contrast" button to adjust the	–
	brightness and the contrast while viewing the scanned output
	image on the screen. If you are scanning with a WIA-compliant
	application or the "Scanner and Camera Wizard", click "Adjust
	the quality of the scanned picture" or the "Custom settings"
	button, and adjust the brightness and contrast in the screen that
	appears.
The original is not placed face up in the SPF or face down
on the document glass.		21, 22
→	Place the original face up in the SPF or face down on the
	document glass.
The original was not placed in the correct position.		21, 22
→	Place the original correctly.

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