Make sure the manula paper feed slot is closed.
Access Printer Properties or Printing Preferences
Select the Finishing Tab
Select Print on Both Sides
Select OK
Then print the document(s)
If you are, then if the printer has a Duplex option just set the option in the driver.
If the printer does not have a Duplex Option installed, then you will have to feed the paper manually and set the driver to allow the the removal and reinsertion of the paper.
I need to configure the HP Laserjet 1400 printing option, to start from tray 2 I have tray 1 mode...
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I need to configure the HP Laserjet 1400 printing option, to start from tray 2 I have tray 1 mode first, and I need to make tray 2 mode first. hwo ?