This is a common problem with 4250/4350 fusers.They have a seperate heating element for envelopes in the middle of the heat roller that is not controled by the thermistor.If I trick the printer (with paper path tests) into printing on an envelope while thinking it is letter the problem dissapears.I think HP will have to fix this, perhaps with driver or firmware upgrades.
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Since there are few step you have to complete before you can pirnt envelop
and theis site will not let me listed all of the step and pic to show you how it is setup.
the following link is the HP 6480 printer define how the evelop printing is done.
start on page 21. http://h10032.www1.hp.com/ctg/Manual/c01325559.pdf
I have been informed that these fusers have a seperate heating element in the middle of the heat roller for envelopes to save energy and it's temperature is not sensed by the thermistor.If I trick the printer (with paper path tests) into printing envvelopes while thinking that it is letter the fusing is ok.
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.