Brother HL-1260 - Manual (Page 131)

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Figure 1.3
3.3 Additional Information
When servicing or adjusting the optical system of the printer, be careful not to place
screwdrivers or other reflective objects in the path of the laser beam. Be sure to take off any
personal accessories such as watches and rings before working on the printer. A reflected
beam, though invisible, can permanently damage the eyes.
Since the beam is invisible, the following label is attached to the inside of covers where
danger of exposure to laser radiation exist.