Question about HP Officejet J5780 All-In-One Printer
If the phone line is attached to the unit, you may hear the fax line ring because as I recall, that circuit is powered by the phone line, but it will not answer or receive a fax while it's not plugged into the power outlet.
If that's not what you meant, please clarify and I will attempt to further help you.
Posted on Mar 18, 2011
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Posted on Jan 02, 2017
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