scanner horizontal lines

Archived from groups: alt.comp.periphs.scanner (More info?)

Here is a sample:

http://home.earthlink.net/~storageplace/untitled.jpg

CanoScan FB 630P
Was scanning some pictures, and from one picture to the next, lines
started showing in the scan. I took off the glass from the scanner,
and sprayed some compressed air from a can... hoping it was a piece of
dust on the sensor (though I don't know what the sensor looks like,
since it was tucked under the body of the scanner and I just removed
the glass). There was no improvement.

Has anyone had luck trying to clean the sensor or calibration area?

Could it be something else? I haven't changed the power supply.