1. Do not loosen or adjust the screws securing the LD drive board on the LD unit. Doing so will put the LD unit out of adjustment.
  2. Do not adjust the variable resistors on the LD unit, as these are permanently adjusted at the factory. If replacement of the LD drive board is necessary, replace the entire LD unit.
  3. Keep the polygon mirror and toroidal lens free of dust. Laser performance is very sensitive to dust on these components.
  4. Do not touch the shield glass or the surface of the polygon mirror with bare hands.
  5. Do not adjust the Laser Synchronization detector on the LD unit, as these are permanently adjusted at the factory.