Question about OKI C5150n Led Printer

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Printer problem I am receiving a message that says to "load letter and press online switch the MP tray is empty. The tray is full and the printer will not print. It fires up and gets ready and then nothing but the message. Please help me quickly.

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  • lwestatbus Jan 23, 2008

    I have the same problem as the original poster. I have tried all settings on both the hosting computer and one networked computer to no avail. I just tried the second solution of reinstalling the printer driver also to no avail.

    Is there a sensor switch on the tray that can either become loose or defective? I HATE paying service charges to fix something simple but really need the MP tray to work.

  • P1979 Jul 15, 2008

    i am receiveng a message that says "load tray 1 letter(plein) what should i do



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How do I set up the printer and/or my Word document to print from the MP tray? I am using Windows XP.

Posted on Jul 02, 2009

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My advice is to call the Okidata help line! THANKS! for the number.


The on-line manual is useless. A very nice Help Desk lady talked me through the problem, a box deep in the menus that can be accessed only through the front of the printer needed to be 'unchecked'. I hate to confess, I've had the printer for a couple years, didn't know the front flap comes down to allow envelopes to be printed. We've maintained a secondary printer for envelopes.

She talked me through printing everything from the serial number to the percentage remaining of the drums and toner. She also told me to put away the compressed air, this time it wasn't a sensor. (There was a problem with a dirty sensor a week ago when the printer didn't recognize the black ink cartridge.)

Would I ever buy another OKIDATA? Not on your life. It's been a nightmare, as others have suggested. If I didn't have hundreds of dollars invested in cartridges and drums I'd have dumped it on the sidewalk with a sign STEAL THIS, PLEASE!

The great OKIDATA service desk number will make trying to make use of it much easier.

Posted on Feb 26, 2008

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I first contacted Okidata support through their web site. They suggested ensuring that the MP tray was fully up (pressing the blue button) and asked me to call their support line if that didn't work (1-800-OKIDATA). I called and THEY FIXED THE PROBLEM.

The technician (who was VERY helpful and friendly) talked me through opening the MP cover and blasting it out with compressed air (I had quite a bit of toner on surfaces) and then also blowing out the area on the outside of the MP tray where the paper enters the printer. He said that there was an optical sensor near the external roller.

Anyway, I'm very happy as I have several hundred dollars tied up in toner and need the precise paper feed I get from the MP tray.

Posted on Jan 25, 2008

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I had the same problem from the host computer it was hooked up via usb. none of the other computer on the net that shared had the problem. so i deleted the 5150n driver and dowloaded again first i deleted it from the c:oki/.... dir and then reinstalled. worked from then on.

Posted on Dec 25, 2007

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Check your printer defaults in your printer preferences on your computer for the printer. The document you are trying to print may be set for the Multi Pass tray. Also check the paper size selected.

Posted on Jun 01, 2007

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1 Answer

Message window shows "load mp

The printer tells you to insert a letter format paper in the mp (multi purpose) feeder (the manual tray).
If you press the GO key the print probably proceeds with print job (if has the paper loaded in mp feeder)

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Print job from MP Tray has been received and the MP Tray is empty.

Load the requested media (mmm) in the MP Tray and press ON-LINE.

Check your print driver settings and see if your defualt try is set for the MP Tray. Also see if the page setup for the print job is set for MP tray.

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I received this message when I was trying to print a pdf file. I attempted messing with the positioning of green paper guide to no avail. My co-worker suggested I uncheck the Choose paper source by PDF page size box on the Print pop-up box. This did the trick.

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MP Feeder refers to Multi Purpose Feeder or Manual Paper Feeder or just plain bypass feeder. There should be a door that folds down to gain access to your MP Feeder tray. Try loading letter size paper on this tray.

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paper size,or
envelope size
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Will not print

This usually happens when the paper tray is set to the incorrect paper size.
This printer determines what size paper is installed in it by the little "fingers" on the left side of the tray. When you adjust the paper tray, it determines how those fingers are positioned, and therefore, how the switch reads the paper size.

If the tray setting is off, even by one little click, then the machine may read the paper size as other then letter. If this happens, you send a letter size job to the printer, and it doesnt think it has letter size paper, it will tell you to put letter paper in the MPF feeder.

If the tray is definately set to letter, but the machine still thinks it does not have letter, then the tray or the switch that reads the tray is defective, but 99% of the time it is just the tray is not set correctly.

The MPF door can be open or closed 100% of the time with NO EFFECT on how the printer works.

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