The lower tray (2)is for PLAIN paper, the upper tray(1)is for printed special paper. Copy paper is taken from Lower tray but incoming fax paper is taken from upper tray. This is not what occurred on my 7140xi where both copy and fax and 3/4 of normal printing came from the lower tray. It should be obvious to most mortals that incoming faxes should be printed on plain paper but not as yet to the boffins at HP who insist that the machine is operating as designed. HELP! PS Although there is an option to change the copy paper to come from either the top or bottom tray, there is no such option for incoming faxes.
Press setup on printer select preferences and select default tray as 2 and try making copy and also check while receiving fax and also follow this link http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01096354&cc=us&lc=en&dlc=en&product=1119598&dlc=en&lang=en
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Yes, I'm seeing this same behavior. Even though Tray 1 is the one with paper sensors that supports multiple paper types, both FAXes and even configuration reports and FAX logs insist on printing on whatever is in Tray 1, even when it's HP 4x6 Photo paper that is loaded.
As though not only does the FAX feature ignore the "Default tray" configuration setting for the printer as a whole, but it also ignores the FAX-specific "Paper size" setting of "Letter" and prints on any size paper that is loaded.
Either of which are issues HP can address in the L7780 firmware. Losing whatever FAX happens to come in while I'm printing photos (because HP has 250 sheets of plain paper available that it chooses not to use, and instead prints the FAX on 4x6 photo paper) is a bug, not by design.
Best Solution 1 below is NOT a solution. I use tray 1 for envelopes and set the default in setup andd copy as tray 2. You can not use tray 2 for envelopes. All is well until a fax arrives and prints on an envelope. Called HP and they did not have a clue. I am hoping for an upgrade to the firmware.
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