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On a dot matrix printer, you should never lubricate which part?

  • A.carriage rails
  • B.printhead pins
  • C.paper advance bearings
  • D.carriage bearings

Answer: B

Correct answer: printhead pins

The pins fire through a lubricant-free guide and are cooled by airflow; oil on them collects paper dust and jams them. The rails and bearings are the parts that do need lubrication.

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