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hp 7640 won't stay connected

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HP Envy 7640
Microsoft Windows 10 (32-bit)

HPEnvy -every time I try to print, it tells me the printer is not available, can't be found, isn't connected.  Sometimes it is as simpe as cycling the power.  But often I will spend 20-30 minutes trying everything I can think of - turning on and off on my computer, running the HP printer check software, checking the printer's wireless connection, resetting the wireless, powering offf and restarting the printer.  today, I finally got it printing.  It printed a couple of items and then lost connectivity again.  I cycled several times, checked the wifi connection, cleared the queue and resent the item to the printer.  After another 15 minutes or so of fussing with it, it finally printed the document.  i've searched the web and tried anything  I could find.


I am at the point of giving up and buying a non-hp wireless printer.  This just isn't worth it.  So if someone has a magic answer, I would love to hear it


BTW I have Windows 10, my husband has windows 7, i believe, we have the same problem  So it is not the computer!

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Make and model number of router? 


These settings are for setting up your wireless printer to stay connected to your router, keep wireless devices better connected and makes your router secure and hack proof.


While DHCP is convenient, devices such as printers should always be assigned a static (fixed) IP address manually to avoid conflicts on your wireless network.


  1. Set a static IP in the printer (click here) outside the DHCP range of the router (check your manual). This is for Linksys routers but can be used for all routers. Verify your DHCP range and change this first if needed. More Wireless Printing help is here (Windows solution 4, static IP).
  2. Verify in the printer that 'Auto Off/Sleep/Energy saving mode' is disabled and/or the System Mode Time Out is set to zero (0). Use the Embedded Web Server (EWS) by going to the printers IP address in your browsers address bar, click Settings Tab/Auto Off. Or use the Printer Assistant, Printer Home Page (EWS). Also check your Printers Properties.
  3. If the printer supports and has IPv6 enabled, turn off IPv6 in the printer.
  4. If needed and you assigned a static IP address, try using for the Preferred DNS server and as the Alternate DNS server in the printer.
  5. Wireless printers only work on the 2.4Ghz wireless band not the 5.0Ghz band.
  6. Verify the printer is on the latest firmware by checking with the HP Support site.
  7. Check all wireless devices in your home for interference. Check microwaves, baby monitors, wireless phones and wireless alarm systems are a big culprit.  Any of these will knock out your wireless printer intermittently.
  8. Make sure your printer and router are at least 5 feet apart from each other.


In the router: (Refer to your router manual for information) 


  1. Use a fixed wireless channel like 1, 6 or 11, never 'auto', try channel 1 first then the rest. 
  2. Set router to 20Mhz only, or 145Mbps depending on router. 
  3. Always use WPA2-AES (Personal-PSK) encryption, but you can try ‘mixed’ mode. 
  4. Disable WPS and never use it and disable UPnP for the routers security. Nobody can hack your system now and helps with wireless connectivity (if you want to know why, search the web).
  5. If you have a dual band router (2.4Ghz and 5.0Ghz bands), make sure the SSID’s are NOT the same, they must be different for all bands, even for any Guest networks.
  6. SSID broadcast must be enabled.
  7. Always make sure your router is on the latest firmware.
  8. Save all settings. Power off both, wait 2 mins.  Power on router wait 2 mins. 
  9. Power on printer and verify it reconnects to router. 


Microsoft announced a Windows update to address device discovery ...waking up devices from sleep mode. Update your Windows 10.


If you have Windows 7/8/8.1   Is Network Discovery on or off?


  1. Control Panel/Network and Internet/Network and Sharing Center/Advanced sharing settings.
  2. Under Home or Work (current profile) / Network Discovery.
  3. Select "Turn on network discovery" and save changes.


Now the last thing to do once all the above has been tried and you still have the same issue, fully de-install and remove the printer and all its software. 


Use .  Use Powerful Scan at the end and delete all registry entries shown.


Now go back and reinstall the Full Featured Software and Drivers from the HP web site.


Last ditch effort - If your printer has an Ethernet connection, suggest you get some Power Line Adapters and convert your house wiring to Ethernet for your printer.

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router ID



Will try this today.  Thank you.  Will let you know.

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Diagnostics says printer is not configured with a DNS server address. I don't know what that is and how to do it.

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