I have an HP 2605dn that is a great color laserjet. It comes with a built-in duplexer and works wonderfully under Windows XP, but in Vista (64-bit in my case) the duplexer option is not available. I spent some time digging through many forum posts, none of which were helpful. One said to use the generic PCL6 driver, but that caused the printer to stop printing in color, and only offered a manual style of duplexing. I was beginning to get mad. Then I found this...
http://forums13.itrc.hp.com/service/forums/bizsupport/getattachment.do?attachmentId=289144&ext=.pdf
The gist of the dcument is this...
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Use the HP Color LaserJet 2605/2605dn/2605dtn PS driver that comes with Vista.
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Right click on the printer and select "Properties" from the context menu.
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Select the Device Settings tab.
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Scroll down to the Installable Options section and click the setting next to Duplex Unit (for 2-Sided Printing) to switch it from
Not Installed to Installed.
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Also in the Installed Options change the following Hard Drive options...
Change "Printer Hard Disk" from Installed to Not Installed
Change "Job Storage" from Enabled to Disabled.
Save the changes and the next time you print, the duplexing option will be available and you will still be able to print in color.
Later in the document it says...
"Download and Install the Printer Drivers from HP.com when they become available"
But as that document is over two years old, HP has not released new drivers for this printer, and Windows 7 is about to debut, I reckon new drivers aren't forthcoming. In fact, I'd bet that they release a new printer with slightly modified firmware and bump the rev so that they can justify abandoning this printer and force us to buy a new one.
Note: The same instructions work for Windows 7 Beta. I am currently running 64-bit Windows 7 (Version 6.1 Build 7000)