What is it wanting me to do when it says "install duplex unit"?

You will have to find in printer driver ----> change accessories and you will have to CHECK duplex unit. Then you will be able to use the duplex.
Good luck

You need to go into the print driver on your Windows machine and go to the Device settings tab. One of the settings is to set whether the unit has a duplexer or not. It does not always set automatically.

I've worked on these printers for years and I never heard of a "duplex transfer belt".
Sounds like you broke a wire or missed plugging in a connector.
Probably a bad Duplex Feed Drive assembly or bad DC Controller.

Hi shiana,
On the right side of your copier is a "box" called the duplex unit.It really is a silly *** box LOL.Now....either it is not firmly latched to the copier .......OR....the metal tab on the main copier is bent so that even if you put the duplex unit firmly in place ........the little switch on the duplex unit is still not :satisfied: And we hate that. I bet ya got it fixed in a jif. take care :-)

In Windows 7, you can right click on the printer under Devices and Printers, then select "Printer properties" (not "Properties"), then under "Device Settings" you can set the "Duplex Unit" to "Installed". Afterwards, you can go back to "Printing Preferences"->"Finishing"->"Print on Both Sides"->Print on Long/Short Edge.

did you properly conect the all connectors?
See instalation manual.
Maybe the duplex unit didnt set very well.
Where paper jam occurs?
Try to clean all rollers on duplex, maybe the unit were very long time stored badly.

Pls. give more info!

Go to the start menu from the windows desktop then go to printers and faxes then when you will see the driver for the AP 3200 click the right click while the pointer is on the driver and then click properties from the drop menu, then go to accessories and see do the Duplex unit is selected but first see do you have the duplex unit on your printer you will easy notice by the picture when you will select the duplex unit.If you have the duplex unit on the printer then just select the duplex unit then click apply and then ok and now you can close the window. now when you will want to print duplex when you will click the print button from the word or PDF document go to properties and select that you want to print duplex

This unit needs to have a duplex unit installed if you want to duplex. If the back of the unit is "flat" you do not have a duplexer installed.

the duplex unit slides into the back of the printer between the back door and the paper tray. when installed you will have a bulge on the back of the printer about 7 inches tall and the width of the printer that sticks out about 5 inches.

after installing the dupelxer you may need to enable it in the print driver under properties then the advanced tab you should see a spot for advanced settings.

Hi,

I had the same problem. It was due to incorrect properties in the printer settings.

1. Go to Start >> Printers and Faxes
2. Right-click on the HP 2420 printer and select Properties.
3. Go to the Device Settings tab.
4. Under Installable Options, set Duplex Unit to Installed.

Also, make sure that the Printing Preferences are set to Two Sided Printing:

1. Go to Start >> Printers and Faxes
2. Right-click on the HP 2420 printer and select Printing Preferences.
3. Go to the Printing Shortcuts tab.
4. Select the Two Sided (Duplex) Printing option.

That should do the trick.

HP - please change your setup so that this is set by default!!

Brian Z

First, the machine always prints the first page first. Make sure you have the right driver (4 plus and not 4)and check the settings in the device settings of your printer driver on the pc. Also make sure the duplex unit is for the 4 plus and not the 4.