Question about OKI ML321 Matrix Printer

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Constant Alarm Light on Oki ML 321 elite

We have a constant red alarm light when we switch on the oki printer, it seems that the ribbon trys to run then makes a funny clicking noise and goes back to its original position on the far left, wherever you leave the ribbon to begin with.

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  • richard_ward Mar 12, 2009

    Also, there is nothing blocking the carraige to stop the ribbon running.

  • NEV2DEP May 11, 2010

    Is the alarm solid or flashing?

    are you using genuine Okidata ribbons?

    also try powering the printer on without the ribbon, does it still show the same alarm condition?



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SOURCE: Oki 320 turbo alarm light

Check/clean the carriage sensor. This part is under the head/ribbon holder assembly. You should also check the tensioner to the black guide/railings when the carriage assembly runs. This is the one with the gear.


Posted on Nov 12, 2007


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Problem is with your carriage motor,it needs to be replaced.

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A blinking alarm usually means an hardware error of some type, such as an obstruction on the printhead, or a bad motor or such.
When you have a blinking alarm light the other lights that are on will give you an error code that will tell you what the alarm means. You will need to look it up at Okidata.

Posted on Dec 10, 2007

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SOURCE: Alarm light Microline 320 Turbo 9 pin printer - won't print

We swapped out the printer for another one we had in the office that was working. The new printer also got the alarm light. From that we concluded that it was a bad serial card. We swapped the serial card from another printer, and the original printer started working perfectly. Now we just need to find out where we can purchase another serial card, as we have no more 'spares' around here.

Posted on May 23, 2008

  • 40 Answers

SOURCE: printer not printing

Try taking the ribbon out and power the unit on, does the alarm light go off ?
If so the ribbon could be jammed.

Posted on Nov 23, 2008

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