Question about Okidata 591 Printer

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Ribbon Slips Off Okidata ML 395

The ribbon keeps slipping off of our Okidata Microline 395.

I've removed the head to clean out any built up "gunk", but it appears to not be taking up the slack well enough as the printhead moves back and forth.

After printing a few lines, the ribbon will slip out over the capstans.

It was printing just fine until I did this as I replaced a ribbon that had gotten "chewed up" at the end of its life.


When this happened in the past we were able to send it in for repair and the repair people said the printhead was not seated properly, but did not elaborate further.  I have a working ML 393 right next to it, and as far as I can tell, both print heads are seated exactly the same.


What am I missing?






P.S.  You have no product category for this printer.

Posted by Fastserv on

  • Fastserv Oct 22, 2007

    I'll now answer my own question so it will be available for people in the future:


    The problem is with removing (and incorrectly re-installing) the printhead.  As I alluded to in my question, the head was not re-installed correctly.  When the printhead is put back on the printer, it absolutely MUST be held so that it's pulled as far back away from the roller as possible while still being seated in its recess before tightening the screws which hold it on.  If this is not done, it causes drag against the ribbon and the ribbon does not advance as fast as it should be when printing.


    I found this out by reviewing a service manual I'd downloaded.


    I suppose the reason this elaboration was not shared by the repair facility previously was because it's an easy buck for them to make if it happens again.


    - James



1 Answer

Desmond Pillay

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Your printhead is in correctly but not aligned, Please loosen the 2 screws that holds the printhead.Remove ribbon(all this while the printer is powered off) Now look on the right side there is a lever that makes the printer go closer to the ribbon ,move the lever to number 9 and move the head over to the left side of the printer.push the head forward slightly towards the black roller and tighten the 2 screws again ,install the ribbon and move the blue lever to 1 and try printing again.
Hope this helps.Dezzi

Posted on Nov 29, 2008


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