According to the HP Driver Support Website their is no HP Scan Driver support for the "Laserjet 3050" model using the Lion version of OS X, I'm sorry to say:
Products with NO scan, print-only support from ASU
The following older products have print-only support with no scan software in Lion:
- HP Color LaserJet 2800, 2820 and 2840 All-in-One Printer series
- HP LaserJet M1120 and M1319 Multifunction Printer series
- HP LaserJet 1220 All-in-One Printer series
- HP LaserJet 3015, 3020, and 3030 All-in-One Printer series
- HP LaserJet 3050, 3052, and 3055 All-in-One Printer series
- HP LaserJet 3200 All-in-One Printer series
- HP LaserJet 3300, 3310, 3320, and 3330 Multifunction Printer series
- HP LaserJet 3380, 3390, and 3392 All-in-One Printer series
If you have one of these products, use Apple Software Update (ASU) to obtain print-only functionality in Lion. You will need to use the control panel to scan.
Hope this helps 🙂