How do you get HP-CP5225 Printer setup to properly print checks?

Question

I have tried to set up this printer to feed standard 3 per page check in portrait format via the manual feed but cannot get them to properly print. Printing comes out like landscape which would not work for using a trolly for one or two checks. I am at wits end trying to get a solution.

UKR · Answer

From the HP website I see that the CP 5225 printer can process large sheets of paper, up to DIN A3 or 11x17".
When printing a full sheet of Standard checks and they come out sideways, have you tried loading the paper turned sideways? Or putting the checks on top of a paper tray which is properly loaded with 8.5x11" paper?