Error 10 on Xerox Phaser 780

It is a problem with the laser unit. The engine control board did not receive a signal from the laser start-of-scan sensor within the specified time.

  • Test the top cover and right front cover switches for proper operation. 
  • Power for the laser unit is routed through both switches.
  • Replace Laser unit - fuser.
  • Replace the engine control board

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