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During preventative maintenance on a dot matrix printer, do NOT lubricate:

  • A.Platen assembly
  • B.Print head pulley
  • C.Print head pins
  • D.Paper advance gear bushings

Answer: C

Correct answer: Print head pins

The pins must run dry: oil on them collects paper dust and jams them, and they are cooled by airflow that a lubricant would impede. The platen, pulley and bearings are the parts that do need lubrication.

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