HP Color LaserJet 3800 Printer series - Manual (Page 167)

Printer will not perform duplexing (2-sided printing) or duplexes incorrectly
Cause Solution
● For Windows 2000 and Windows XP, click Start,
and then click Printers.
2. Select the printer.
3. In the File menu, click Properties.
4. Click the Device Settings tab or the Configure tab.
5. Under Installable Options, click Automatic
Configuration.
6. Click Update Now.
Printing is only on one side even when 2-sided (duplex) is selected
Cause Solution
Manual 2-sided printing is not enabled. Configure the printer driver to enable manual 2-sided printing.
See
Gaining access to printer driver settings .
The paper size that is selected does not support 2-sided
(duplex) printing. Load and select a size and type of paper that supports
automatic 2-sided printing.
ENWW Paper-handling problems 153