HP CM3530 - Manual (Page 239)

Product will not duplex (print 2-sided jobs) or duplexes incorrectly
Cause Solution
1. Click the Start button, point to Settings, and then click
Printers (for Windows 2000) or Printers and Faxes (for
Windows XP).
2. Right-click the HP product icon, and then click
Properties or Printing Preferences.
3. Click the Device Settings tab.
4. Under Installable Options, click Update Now in the
Automatic Configuration list.
ENWW Paper-handling problems 225