I have a Dell Printer 720 and envelopes won't print.

Have you already tried this? After you click print and select your printer, click properites and select your paper from 8.5x11 to Envelope.

when you print envelopes you have to choose the envelopes in the printer settings then only machine knows that envelope is printing. when you don't select envelope in printer settings when you sent a print, the printer knows the a normal paper is coming through. the difference is that the envelope is a bit thick the normal paper. when envelope is selected in printer properties then the printer adjusts its settings to print on envelopes.

Check to see if you are feeding the envelopes and 4x6 cards/photo paper correctly.

Both envelopes and 4x6 cards must be loaded and centered on the paper exit tray (not inside the paper input tray).

Printing envelopes:

• Up to 15 envelopes can be loaded at a time.
• The print side of the envelope faces down.
• The envelopesare centered on the paper exit tray.
• You print the envelopes with Landscape orientation.

Printing cards:

• Up to 35 greeting cards, index cards, postcards, or photo cardscan be loaded at a time.
  
• The print side of the cards faces down.
• The cards are centered on the paper exit tray.
• You select Automatic, Normal, or Photo print quality.

For images on how to correctly load the paper, download your printer user's guide:
http://support.dell.com/support/edocs/systems/prn946/en/index.htm

there is either a tray that pulls out in the front or the back thats adjustable... check your operations guide or sparing that consult kyocera help desk

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

Hey,
This may be a bit late, but I just posted a solution to the Dell 5210 envelope problem here
http://www.laserprintercenter.com/laser-printer-news/2010/10/envelope-printing-and-laser-printers/
Basically, it has to do with the envelope enhance feature...

hi!!!
what type of printer ur using?
because the other color of catridge nozzle might have been clog
this are step that you need to do!!!
1.perform maintenance of your printer in the setting
2.clean up the nozzle.
3.remove the cartridge clean with alcohol or solvent use cotton buds.
4.if doesn't print again replace your cardridge.

or email me [email protected]

Switch the pink cartridge with the black one.

Be sure you have set the PRNIT PREFFERENCES on your program that you are using to print the envelope to accept a #10 envelope and not 8.5x11 paper, you ALSO must set the PRINTER PREFERNECE to MANUAL FEED and not automatic so it won't look to the paper tray.
//CowboysFanZ

hi dear

Choose envelopes that are close to 20-lb paper in weight and thickness. Also, make sure that the adhesive on the envelope is capable of withstanding the heat that the fuser puts out to keep the printing on the page. If you don’t, the envelopes will come out of the printer already sealed. If envelopes are coming out of the printer wrinkled, they may be too stiff for the paper path. Open the rear of the printer and let them exit at that location instead.

oke

cropp

I got the printer to print envelopes again. I completely uninstalled the printer, then reinstalled it by simply pluging the USB connection in. After I had first uninstalled it after the envelope problem started I had been using the 720 printer CD to reinstall it, and it still wouldn't print envelopes. I looked for and found the printer installition instructions and saw that I didn't need the CD to install it. (It was causing a software conflict). The Dell 720 Printer came with my Dell Dimension E310 PC new and the printer software was already on the hard drive. All I had to do was plug in the USB cable, and the printer was up and running like new again. Don't forget, if you don't want Dell to monitor your printer use, DO NOT check the box to allow that when it comes up during installation, other wise you'll get that icon showing up. Hope this helps. Chuck