Error Message Close top cover for HP LaserJet M601, M602, M603 Series Printers.

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HP Say:

Close top cover

Description

This message appears even though the top cover is closed.

Recommended action

  • Verify that the switch (SW101) is properly functioning (open and close the top cover). If the switch fails the test, replace the switch.
  • Make sure that the switch flag—at the right-side of the top cover assembly, behind the controlpanel display— is not damaged or missing. If the flag is damaged or missing, replace the top cover assembly.
  • Reconnect the connector (J78) on the DC controller PCA.
  • If the problem persists, replace the top cover switch (SW101).
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