HP 3840 - Manual (Page 46)

3. In the Copies box, type the number of copies that you want to print.
4. Select the Collated check box.
5. Select any other print settings that you want, and then click Print.
8.3 Manual two-sided printing
Follow these instructions to print a two-sided document:
1. Open the Page Setup dialog box, and then click the appropriate orientation
option.
2. Click OK.
3. Open the
Print dialog box.
4. Select the Layout panel.
HP Deskjet 3840 series printer User's Guide
46