10 August, 2001 LASER EXPOSURE
2-23
Detailed
Descriptions
2.3.3 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 SBCU and IPU boards.
When the front cover or the right cover is opened, the power supply to the laser
diode is interrupted.
IPU
PSU
Front Cover Safety and
Right Cover Switches
SBCU
+5V
+5VLD+5VLD
LDD:
LD Drive Board
VCC
LD Driver IC
Laser
Beam
OPC
Drum
Optical Path
PD
LD
B027D500.WMF
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