Oki 520/521 alarm light flashing,utility and prop light on

Most likely, you need to lubricate the shaft the head moves on and clean the positioning tape (carefully, the marks on it can be dissolved).
Unplug the printer while it's moving the head, so you can manually move the head around. Use light oil, such as used in sewing machines.

try these links for a user manual:

ML1190eco User Guides Manuals

http://www.manuals365.com/oki/ml11uen2_tcm3-45862-manuals365.html

Sir the printer is giving line because the cartiage or toner is not of good quality so it does not melt properly and produces line while the alarm comes and stop printing is due to the problem in charging cathode or gutter

This is a "spacing alarm". check that the printhead moves freely from left to right. If not, remove the ribbon and try it again. If it is moving freely then it should be ok, if not it will need most likely the space motor or the main board replaced. In some cases it is also possibly the white carriage cable that runs from your main board to the space motor. Hope this helps.

Hi, I have the same problem, my solution is: change the cooler in bottom of the printer.

try switch off, unplug, hold up and down & reset button at the back, swith on

You have a fatal error, what kind of error is specified by led combination of PRINT QUALITY and CHARACTER PITCH.

Hi,
Is the front cover on the printer(ifs its not the alarm light will keep flashing as there is a sensor that will trigger the alarm if the cover is not on or not on properly.Hope this helps?
Dezzi

What driver are you using ? the default driver should be IBM Proprinter.
Hope this helps
Dezzi

Check if the Pico fuse is blown ? next to the heat sink on the transisitor array with the number 2025.if the fuse is gone than the fuse plus the 2025 transistor must be replaced.
Dezzi