HP Laserjet 3100 Fax problem

Q: Hi, i have an HP Laserjet 3100 Printer that can send faxes. However, i don't know which tray the document i want to fax goes in. There is a little envelope logo on one of them, I think thats it, but I want to be sure. Please help, I know it's a dumb question.

A: when you fax put papers lettering face down in the first tray in the fron of the machine the back area is where you put clean paper so when you get a confirmation it will take a paper from that back tray..

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