Lines on doc wont print

I have an very similar problem, I was told its down to a faulty batch of image drums supplied by OKI.

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This is a simple and common problem with many LED print head printers. You just have toner dust on the surface of the print head. Run your finger along the head and all will be well.

I recently purchased an OKI specifically for my stationery business as well (using metallic cardstock) and the company told me that no OKI printers work on metallic paper... I am STILL on the search for an invitation printer! Its frustrating to say the least....

Could very well be the sensor window. I suggest looking at the side of the drum on the right side and pushing a q tip into the opening. heres an older model thats sort of similar instructions. http://www.c3400.co.uk/index.asp?menumode=0&content=sensorerror
Also you can check the exact error code here. http://www.okic3400.co.uk/library/downloads/utilities/c3300c3400smv1115.exe

Try cleaning the print head as described in the user guide. There could be old ink clinging to the head. If this doesn't take care of the problem, you could have a burnt element, which is non-fixable problem.

Check printer setup where you define carrige return and line feed options. Alot of times you need to set printer to do an auto CR on reciept of LF or auto LF on reciept of CR. I run into this all the time.

If your print fades in then out every 5-6 lines, your platen probably has flat spots on it. This can be caused when someone forget to perform an alignment on a PH.

To run a test page you can power off the printer. Hold down the LF key and power on at the same time, this will print a self test.

Reset to factory defaults by pressing the FF/Load and Tear buttons together while powering on the printer,and try again to print.
Dezzi

One of the drum cartridges is stuck. Test by removing them one at a time with the printer off, then turning on.