I Have 2 Dot Matrix printer on my system. One is a OKI 390 Microline and is conected to the computer via network and the second one is a OKI 380 Microline, conected directly to the computer. Have in the computer, boths drivers but every time that I send a job over the printer, only one is working (the one conected via network). How can I do so the printer conected local to the computer can work properly when I need it.
Sounds like the driver for the locally attached printer is incorrect.
Try uninstalling the driver, then turn the printer on and press the online button to make sure it is online so your PC can see it. Then reinstall the driver.
Hopefully plug and play will discover it.