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Oki ml521 printing problem

A new original OKIml520/521 ribbon only lasts 4 days in the printer - then I have to replace it. What can the problem be? It sounds impossible that a ribbon is finished in 4 days. No excessive printing is being done.

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There's a small metal spindle that turns the ribbon when the carriage moves. It sticks up out of the plastic bit where you put the ribbon. These can break so the ribbon doesn't turn so it prints in one patch of the ribbon so it wears it out quickly

Posted on Oct 13, 2009

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Check the new ribbon and see if the printer has worn out one spot.
If you move the print head manually side to side the blue knob on the ribbon should spin. If it does not make sure you have the correct ribbon and it is installed correctly.

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Make sure that you have a good ribbon installed and that the ribbon is advancing as the carriage moves. If the ribbon is not advancing it will only print until the ink has been used up on the section of ribbon stuck in front of the print head. It will also need a new carriage if the ribbon is not advancing.

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If I remember the 320, there is a head-gap adjustment that is normally moved for replacement of the head and must be reset again. Check your manual for that term; 'Head gap adjustment'

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You have replaced the item which is commonly the cause- the printhead. The other possible problems are: a connection break in the printhead ribbon cable, which makes electrical connection from the driver circuitry to the printhead. Look for a tiny crack, especially along the edge of this ribbon cable. Another possibility is an electronic component defect in the circuitry which fires the printhead, or maybe a loose solder connection in the same circuit. Lastly, when you replaced the printhead, are you reasonably certain the replacement head didn't have a broken top pin or two?

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