2 sided printing on HP 7640 not working

[Stakeout]

side  # 2 stopped printing on my HP Envy 7640 ---followed the instructions from a previous older thread on here just to be sure I had the settings correct-- they are    .. no changes to my system as I've had this printer installed for about a year on the same Dell PC Desktop #8930.. this printer just stopped printing on the 2nd side.. it goes thru the motions  .. first prints the top page-- all is okay.. then continues on to pull the paper back into the printer.. makes like it's printing side two but it comes out blank for side two.. have near full ink.. any help- info greatly appreciated

[Jeet_singh]

@Stakeout,

Thank you for posting your query on HP Community,

Are you able to make 2 sided copy from the printer? 

Let’s first try and make a “photocopy” to determine whether the issue is with the printer or not. Place a document on the scanner glass and choose “Copy” option. If the printer is making a good copy, then the printer hardware is fine.

If the copy comes out fine, then I would suggest the next option would be to check the print settings - 

The 'automatic discovery' feature used by some drivers on installation (or update) doesn't always work; ensure that the driver knows that a duplex unit is present on the printer (assuming that one is):

• For the printer instance in question, bring up the Printer properties dialogue.
• Select the Device settings tab.
• Ensure that the duplex unit is set to Installed rather than Not installed.

If the issue persists, I would suggest here is to uninstall the printer from the root level and then reinstall it by following the steps below: 

• Press “Windows key” + “r” to get the “Run” window.
• Type "services.msc" to get Services – Go to “Print spooler” – Right-click and “Stop” the service.
• Now again open "Run" - Type “spool” and ok - Go to PRINTERS folder - delete everything in that folder.
• Go to services again - Start the print spooler.
• Now check for issue resolution.
• If the issue persists, also try clean installing the printer drivers. Here are the steps:
• First, unplug the USB cable from the printer if present.
• Go to Control panel – Programs and feature – Select all the HP Envy printer entries and uninstall them.
• Now go to Control panel – Devices and printer – Select all the printer entries and remove the device.
• Press the "windows key" + "r" to get the "Run" window open - Type "printui.exe /s" (There is a space between .exe & /) and press enter.
• Under print server properties, go to drivers - remove any entry there as well.
• Again, go to the Run window, type – “c:/programdata” – Go to Hewlett Packard folder, remove any printer related folders & files.
• Restart your computer.
• Please click here to download and install the software.
• Connect the USB cable if prompted and follow the on-screen instructions to complete the installation.

Alternatively, you may also refer to this support document for - HP Printers - How to Print on Both Sides of the Paper (Windows) (Duplexing)

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