Troubleshooting Checklist - Canon CanoScan D646U User Manual

chapter 7
Troubleshooting
Top Page
Glossary
Contents
Index

Troubleshooting Checklist

The scanner diagnostics test fails.
Problem: The Scanner Diagnostics test, started with the Test Scanner
button on the Scanner sheet, returns a Test Failed
message.
Cause: The scanning unit may not be in its home position.
Solution: Close the ScanGear CS-U window if it is open. Try turning
the scanner off and back on again by unplugging and
plugging in the USB cable. Then restart your computer.
Colors not what you expect.
Problem: The colors in the preview image appear different from the
colors in the original image.
Cause1: The scanned colors need to be adjusted.
Solution: Make sure the Auto Tone button is selected. If further
adjustments are necessary, use the Tone sheet buttons.
Cause2: The calibration slot on the film guide is obstructed.
Solution: Clear the item blocking the calibration slot.
The preview image of a photograph appears blurred but the
scanned image of the same photograph appears sharp.
Problem: When zooming in on a photograph in the Preview area,
the enlarged image appears blurred.
Cause: The preview scan uses a lower resolution than the final
scan. If you zoom in on a preview image so it is enlarged,
the image will not maintain its resolution in the same way
as the final scanned image.
Solution: Select a magnified area and preview the image again. The
scan should display a sharper image.
79