On my MP780, be careful to select the appropriate paper type; I was getting black smudges on the left side of my envelopes until I explicitly set that my paper type was "envelope" from "plain paper".
Another idea is to adjust the "ink drying wait time" to a higher level.
According to the manual, you should set the Media Type to "[Envelope]" for envelopes. I was getting smearing from side to side by the print head with "Plain Paper", but the smearing completely stopped with the "Envelope" setting.
The Media Type combo box is on the "Main" tab on the "Printing Preferences" dialog. You can get the "Printing Preferences" dialog from the printing preferences button on the Print dialog of your favorite application. You can also set the overall printing preferences from the Printer Properties dialog available by right clicking on the printer in the "Printers" application in Control Panel.
I am using Stamps.com. There is no "Printing Preferences" button that I can find in Stamps.com, but you can still set the overall printing preferences from the control panel, as noted above, to make "Envelope" the default for that printer.
In my testing, it takes 31 seconds to print an envelope from Stamps.com to that printer, using the Auto Sheet Feeder. The manual says you can put 10 envelopes into that feeder. The printed side goes facing up, and the top of the envelope to the left. The return address end of the envelope comes out first.
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dvlknc The paper thickness lever is not on the front...it is on the floor of the "paper output tray" chamber. It is hard to see without directed light.
Refer to Loading Paper section of the Quick Start Guide....p 15 2 Prepare to load paper (4) Adjust Paper Thickness Lever (See diagram)
Or look at the "User's Guide on-screen manual" as directed by the Note on p. 17
I really had to search to find this lever while attempting to resolve my problem with a badly aligned printing head. I am going to have to buy a new printer. It definitely won't be a Canon due to the rip off cost of print cartridges.
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If you're still getting smudges, there must still be a label or part of a label either on one of the image drums or the transfer belt, i've found in the past it somethings gets stuck inside the unit on the cleaning blade. What i suggest is you run a print and open the front door at the paper travels along the transfer belt, look at all the image drums and see if you can see the smudge on one of them, if so the problem is caused by that cartridge if not it's in the transfer belt somewhere. You may need to try stopping the printer a few times and if the problem is in one of the cartridges, you will mst likely have to replace it, as with the transfer belt if you think that's causing the problem it's easier to remove it and rotate the belt manually.
Please note the image drums and the transfer belt are all light sensative
You will need to select in the drive that the media type you are putting in is envelopes this will adjust the printer fusing section to increase the heat.
Also you must select to go through tray one when doing this open the back door and the printed envelope will come out of the back and should be fine. If not try a lesser grade of envelope if still the same problem then the fuser unit is slipping and will need to be replaced.
Are you telling the machine that paper type is letter head or envelopes, It must be done, it changes temp of fuser to suit the paper type, no it is not a power supply problem change paper type to card stock/thick/letterhead etc to suit then machine will adjust temp to suit.. ie file, print properties paper type.