HP ScanJet Pro 4500 fn1 - Manual (Page 53)

— Reconnect the power cable to the scanner, and then turn on the scanner.
— Try to scan another page through the ADF.
Originals are curling up in the scanner output tray.
Under dry conditions, lightweight originals such as those printed on carbonless copy paper may curl in the
output tray. To minimize curl, flatten curled edges on the originals before placing them in the document
feeder.
ENWW Paper feed issues 45