Sharp AL-2021 Operation Manual page 78

Problem
Any one of the
alarm indicators
( , , ) is
lit or blinking.
Poor scanning
quality.
Cause and solution
See "STATUS INDICATORS" to check the meaning of
the alarm indicator, and take appropriate action.
The document glass or the underside of the document
cover/SPF is dirty.
→ Clean regularly.
Original 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 have not specified a suitable value for the "B/W
Threshold" setting.
→ If you are scanning with a TWAIN-compliant
application, 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 "Professional" 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.
→ Place the original face up in the SPF or face down on
the document glass.
The original was not placed in the correct position.
→ Place the original correctly.
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