How do I set OKI B4600 to print to top tray?

You don't say which version of windows you are using. There is no windows 10 driver so you would be picking up a generic driver when plugging in via usb. If windows 7 or 8 then UNINSTALL (not delete) the Universal driver and install the US version 2.2.6. It wont be the printer as printers only print what they get. Its definitely a driver issue.

Open the top cover and take a damp rag clean LED array (thin black strip attached to cover). Then print a cleaning page.

Push in the paper guide/tray in the rear and pull out the one in the front (where there are the arrows)

If the paper output tray is pulled out at the bak then paper will exit through the back (face up). If you push this tray down then paper will exit out the top and lie face down on top of the printer. The tray that pulls out of the front of the printer is a input tray only and cannot be used to output any pages.

It means check the papar tray ...

Do you have paper in the tray?

Do you have the right SIZE paper in the tray?

Is it inserted into the tray correctly? and is it all the way in?

Is there a jam in the paper tray?

Is the tray in the printer correctly? Is there a cover on the tray and it is in the proper position?

Thank you for your question. I hope my response is helpful to you. If it is helpful, the courtesy of a response and positive vote will be appreciated. Thank you.

check the paper tray to make sure paper goes up. Also check to see if there are any obstructions in the paper path.

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_7148ad2a373711a3

Yes. click on your printer icon. select properties then look for Tray or Output Tray or Tray settings and change it

close the rear tray

Is there a menu thing on the screen somewhere

Dear jamin4volks;

As per this excerpt from the Oki B4350 User manual:

"FACE UP AND FACE DOWN PRINTING
For face down printing, make sure the rear paper exit tray is closed (the paper exits from the top of the printer). The paper exit bin on the top of the printer stacks printed pages face down, capacity 150 sheets of 20 lb. paper. Pages printed in reading order (page 1 first) will be sorted in reading order (last page on top, facing down).

For face up printing, make sure the face up rear paper exit tray is open and the paper guide is extended if required. In this condition, paper will exit via this path, regardless of driver settings. Paper is stacked in reverse order, capacity 50 sheets of 20 lb. paper.

Always use this tray and the manual feed tray for heavyweight stocks to reduce the possibility of paper jams."

This manual is available at http://my.okidata.com/mandown.nsf/(MOC-B4350)/BE70FCAF93D577E285256E89005052F9?OpenDocument

Hope this helps;

Frank