How do I use the automatic document feeder (ADF) to scan documents?
Place up to five letter-sized pages in the ADF tray, then press and hold the Scan button until it blinks amber twice indicating a successful initialization. Use HP LaserJet Scan or another compatible software to initiate scanning. Detailed instructions can be found under 'Scan' starting on page 140.
From the official HP Laserjet 3050 All IN One Printer manual, page 140
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