Plustek OPTICPRO 1248U User Manual page 17

The document cover has been designed for easy removal so that larger items,
such as bound books, can be placed on the scanner glass. To remove the cover, open
it all the way. Place your other hand firmly at the back of the scanner and lift the
document cover, separating it from the back of the scanner. To replace the cover,
simply slide it back into place.
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