Laser Exposure 
SM 6-31 D017/D018/D019/D020 
Detailed 
Descriptions 
6.6.3 LD SAFETY SWITCH 
 
To ensure technician and user safety and to prevent the laser beam from inadvertently 
switching on during servicing, safety switches are located at the front and right covers. The 
switches are installed on the +5VLD line coming from the power supply unit through the 
BCU and IPU boards. 
When the front cover or the right cover is opened, the power supply to the laser diode is 
interrupted.