Tray which printer prints from.

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

Not necesarily so, it depends on how you have the printer configured. To test the MP tray, use the arrow keys to get to troubleshooting menu, press check, use arrow keys to get to paper path test, press check, set tray option to tray 1, then print test page. Printer should feed from MP tray. If it does, then the problem is that you do not have the printer set to print from MP tray first or you have the tray options set to exclusive which means that if your print job asks for tray 2 then printer will not print from MP tray unless you specify MP tray in the print options.

check the paper menu for tray 1 setting, it should be set to cassette. then make sure the paper size and type for trays 2 & 3 are set correctly.

Your tray 1 might be open (even just partially) or your manual feed setting might be on. You can find this setting under > Configure device / Printing / Manual Feed

depends on the printer, normal home use printer have only 1 tray.
office printer usually have multiple trys. and usually the default for that is tray 2. tray 1 is manual feed.

Click File > Print > Properties to check your settings.
To verify that tray 1 is working, put paper in tray 1. Press green check until you see Information Menu. Scroll using arrows until you see Print Menu Map then press green check. If it prints from tray 1, your problem is not with the printer, but with the PC settings.

i has follow this step, but need to press green check button to resume print menu map.

tray 1 manual feed set to A4 paper plain size
manual feed is on.
there is paper on tray 1
ps setting tray1 manual feed is A4 plain size paper.

send print to tray1 manual feed even there is paper at tray 1
i still need go to the printer and press green check button to resume print

the manual tray is the is the one above the tray,
1-either your tray is set incorrectly must be set to Letter/Plain
priority is tray 2 not tray 1
tray one is the by-pass / manual
since this printer does not have a screen on it everything is setup through the PC.
print a configuration page and you will see all the settings

A few things could be happening here.

1. Clear the print queue, and if there are jobs that won't delete, reboot the computer.
2. Now clear the jobs on the printer (cancel job button) until the status light turns green.
3. Put a piece of paper in the manual feed tray on the front.
4. Print a test page.
If the test page prints to the paper in the manual feed tray, then it is set as the default tray. Go into the printer settings and change it to "auto" or tray 1. If the test page prints to tray 1, but the original document you tried to print (when it got stuck) still won't print, cancel the job. Now, again, put paper in the manual feed tray. Try to print the document again and if it pulls from there, go into page setup of your document and change the setting from "manual" to "auto" or tray 1. Clear the job again (if it's stuck) and you should be able to print again. Hope this helps. This is one of the most common solutions - it happens a lot, especially with documents that are emailed from other people and once they get stuck in the queue, nothing will print (except the test pages directly from the printer, like you describe).

when you go to the menu of the printer is the paper TYPE set correctly?

tray 2 should be letter ( if using plain paper)

tray 3 legal, label etc...

and tray 1 should be any

Have you tried specifying the paper type and weight INSTEAD of the tray. Set the tray properties first, then print. If you leave it on auto tray it will use the tray that matches your paper type and weight.