There are 4 white buttons on the printer display control panel, from top down.
1. Press left/right on the top button until you see "PAPER HANDLING MENU".
2. Press LF/RT on the 2nd button to "TRAY 1 MODE=cassette/first"
3. If not already in cassette, press the 3rd button to change to "CASSETTE" then the 4th button to confirm with an "ASTERISK".
4. Repeat step 2 and change "TRAY 1 SIZE TO = LETTER".
Make sure you have an updated (PCL5e, PCL6) driver from HP website.
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