OKIDATA ML590 Service Manual page 209

If the emulation is correct, check your software documentation on how to select a printer driver.
Then, check to be sure that you have selected one of the drivers listed for that emulation. Refer to
the Printer Handbook for emulation/driver selections. The closer the driver is to the top of the list
in the Printer Handbook, the more compatible it will be with your printer. If your software does not
have any of the indicated drivers available, check with the software manufacturer to see if they
have added any additional drivers since you purchased your software.
If you have embedded any printer commands in your software, check to be sure that you have
entered them correctly.
7. Printing on the right side of the page is lighter or darker than the rest of the print on the
page.
Although the printer automatically sets the head gap, it sometimes may need a minor adjustment.
To make this adjustment, enter the Menu Mode. Press
To change the setting for the Printhead Gap Adjust under the Setup Group, use the following
procedure.
Press GROUP until Setup Group prints.
Press ITEM until Printhead Gap prints.
Press SEL to change the setting. The default setting is 0. If the printing is sometimes lighter,
change the setting to - 1. If it is sometimes darker, change it to + 1.
Press SEL and SHIFT
8. There are vertical spacing problems when using continuous forms and Forms Tear Off.
The Microline 590/591 does not have a bail arm, so pages do not feed as high as printers with bail
arms. The first page does not line up correctly. Enter Menu Mode and disable Form Tear Off. Exit
Menu Mode. Deselect the printer and set the paper position, using the Micro Feed buttons (hold
SHIFT while pressing MICRO FEED UP or
9. The ALARM light is not on, but paper needs to be loaded.
If the ALARM light is off, the printer "thinks" that paper is loaded. To correct this problem, press
and release the SEL button. Then, hold the
button. The ALARM light will come on and you will be able to load paper.
10. The ALARM light is on and the Character Pitch 15 light is flashing.
This indicates a paper loading error. To stop the flashing light, press the
to load paper, check to be sure that you have the paper lever in the correct position (BOT, TOP,
REAR) for the path that you are using.
CAUTION:
Always power OFF the printer before you turn the platen knob.
If the paper lever is in the correct position and you are using rear feed, lift up the paper separator
and check to be sure that the paper is properly on the tractors and has not jammed.
If the paper lever is in the correct position and you are using the optional bottom-feed push tractor,
check the bottom tractor unit to be sure that the paper is properly installed on the tractors and that
the paper has not jammed.
buttons simultaneously to exit Menu Mode.
DOWN). Enter Menu Mode and enable Form Tear
SHIFT
SEL and SHIFT buttons simultaneously.
button and press the RESET
SEL
(Character Pitch)
button. Before trying