Question about HP 640 Inkjet Fax Machine

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HP 640 fax only displays bars nothing else will work

I have an HP 640 fax machine thats been unplugged for about a month. When I plugged it in again, it just shows bars across the display and I can't get it to do anything. Any suggestions?

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While the printer is powered on.....unplug the power module and then press and hold the # 3 button at the same time......while holding the two buttons reconnect the power module......will fix the problem.

Posted on Jun 01, 2010

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Plug a regular phone into the phone jack and test to be sure you have a dial tone.

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Are you plugged into the LINE port?

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It sounds like you're not set for AUTO RECEIVE. Try unplugging power cord and re-plug in

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I have the HP640 Fax machine and I'm trying to program the distinctive ring mode but when I follow the instruction which state to press the menu button and scroll to advanced fax and press ok and then it...


I had been confused for the past ten months on this issue and just figured it out! Get a distinctive ring from you telephone service. If you have a answering machine, set it to answer on the 4th ring. On the fax, press menue til you get to the BASIC FAX, press OK, scroll the arrow button til you get to the DISTINCTIVE RING, press OK. Call your special fax number assigned from the telephone co, the machine should read DRPD OK, then on the face of the hp640 on the left i believe is a button called Rcv. Mode/Contrast, press that til you get to DRPD Mode, press OK. It should work great!! Hope this helps.

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Can't get this fax machine to work with my answering machine


I have the same problem. I can send a fax, but if I try to receive a fax, the distinctive ring goes off, and it says RECEIVE on the display, but it doesn't receive anything, and there is nothing in the memory. Any ideas? PLEASE HELP!!!!!

May 24, 2008 | HP 640 Inkjet Fax Machine

1 Answer

Can I reconnect to pasha


Plug a regular phone into the wall outlet and listen for a dial tone,

Make sure the phone cord is plugged into the LINE port of the fax machine.

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