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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
Max paper weight is 203gsm so you are near the upper end of specs, you must feed via manual pass and exit from face up tray (out of rear), paper type(heavy/card stock) must be set on print driver. User guide can more than likely be found www.oki.com.
this sounds like it is doing something called a "hex dump" basicaly printing all ASCII characters. okis tend to do this from time to time if l;eft on for a significant period with no data sent to it. the only advice given by oki is to switch it off when not using it unfortunatly
Hope this helps
I found the service manual for this, which should come in really handy for you when performing maintenance on your printer (which is most likely what you need to do to the printer)
Funny thing is that there are a lot of people trying to sell these manuals, so I'd save this one for future use (it might not be on this link for long)