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How to clean the printer head for wepro EX330+DX

How to clean the printer head for wepro dot matrix printer EX330+DX.The printing is not clear
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It's a 9-pin DMP, poor print quality might be because of contamination with ink and other debris building up on the head which can be cleaned with an alcohol solvent and lint-free cloth, but it's more likley that the quality is getting worse beause the pins are worn, in which case you'll need a new print head (assuming you've already replaced the ribbon).
If you can scan a test print out and upload it  it's usually easy to see what the issue is.
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