HP Deskjet 6840 Color Inkjet Printer - Manual (Page 148)

Only one side of the page prints when the two-sided printing option is
enabled
Verify the following:
• The photo paper is not curled, if you are printing on two-sided photo paper.
Photo paper should be flat before printing. See storing and handling photo
paper for more information.
• The paper size that is selected in the Page Setup dialog box is supported by
the duplexer.
• The paper type that is selected in the Paper Type/Quality panel is supported
by the duplexer .
If the media type or size is not supported by the duplexer, you can print the
document by using the manual two-sided printing instructions .
Binding margin is in the wrong place
You might have chosen an incorrect paper orientation.
1. Open the Print dialog box.
2. Select the Layout panel.
3. Verify that the correct binding has been selected:
• The Book button is selected for binding along the side.
• The Tablet button is selected for binding along the top.
12.1.4 Automatic Two-Sided Printing Accessory specifications
Dimensions when attached to printer
124.6 mm (4.9 in) tall x 320.5 mm (12.62 in) wide x 77.7 mm (3.06 in) deep
Skew (second side of printed page)
Plain paper: +/- .009 mm/mm (.009 in/in)
Cards: +/- .006 mm/mm (.006 in/in)
Envelopes: +/- .012 mm/mm (.012 in/in)
Media weight
Letter/A4: 60 to 90 g/m² (16 to 24 lb)
Cards: Up to 200 g/m² (110 lb index max)
Specialty paper: Up to 160 g/m² (44 lb bond)
HP Deskjet 6800 series printer User's Guide
148