HP Envy 7640 All-In-One Printer

[Anita113]

My printer will not stay connected to wireless router and send an error message

[Dragon-Fur]

@Anita113 

Welcome to the HP Community --

True - A non-specific error message that contains no added text or information is less useful than an error that gives you a hint of where to look for the problem.

Ideas...

I found a review for this printer dated 2014.

If you are running a Dual Band Network, connect the printer to the 2.4GHz frequency.

What?

Printer might not support Wireless at 5GHz.

Printer might not support or like a Mesh network.

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Dual Band Network - Wireless Considerations

Reminders 

Some printers, particularly older models, only support 2.4GHz

Some printers support both 5GHz and 2.4GHz – but not at the same time

Regardless, if the printer won't work or cannot connect to your 5GHz frequency, try 2.4GHz.

If you are running a Dual Band Network,

 Check that the router is set up to broadcast all frequencies it supports.

Next,

If your router supports it,

 Create a separate SSID named network for each frequency (5GHz and 2.4GHz).

and

 Connect the printer to the SSID network on the frequency / band you want it to use.

In general,

• 2.4GHz is less fussy about obstacles and supports a longer distance (separation) between router and device (printer)
• 5GHz is faster

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What else?

Offline Condition

Although the printer appears to be switched on, it does not communicate with other devices on your network.

Consider >> Restart All

Restart Everything, including the router that controls your network

Next,

Offline - Known solutions, presented in the order to be completed / considered

  HP printer is offline or not responding - Windows / Mac  

Section “Advanced Troubleshooting” > Solutions specific to Windows / MacOS / HP Smart (Printer Unavailable)

AND

Troubleshoot a Wi-Fi connection to an HP printer 

 HP Printers - Using a Wireless Network Test Report

References / Resources

User Guide

Starting on Page 82

 HP ENVY 7640 e-All-in-One Printer Specifications

Connectivity

Connection method	Requirement
Wired (Ethernet)	Yes
Wireless	Wi-Fi 802.11b/g/n
USB	1 USB 2.0
Direct print supported	Wireless direct printing; Memory card slot

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HP Printer Home Page - References and Resources

Learn about your Printer  - Solve Problems

“Things that are your printer”

When the website support page opens, Select (as available) a Category > Topic > Subtopic

NOTE:  Content depends on device type and Operating System

Categories:  Alerts, Access to the Print and Scan Doctor (Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, Manuals > User Guides, Product Information (Specifications), Supplies, and more

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HP ENVY 7640 e-All-in-One Printer series 

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