Ld Safety Switch - Ricoh B121 Service Manual

6.6.3 LD SAFETY SWITCH

Front/Right Cover
Safety Switches
+24V
PSU
To ensure technician and user safety and to prevent the laser beam from
inadvertently switching on during servicing, there are safety switches at the front
and right covers.
When the front cover or the right cover is opened, the power supply to the laser
diode is interrupted.
The switches are installed on the +24V line coming from the power supply unit,
then the +5VLD is generated from the +24V supply after it goes through the
interlock switches.
SM
+5VLD
REG
BICU
6-31
LASER EXPOSURE
LDD:
LDD Drive Board
PD
VCC
Optical Path
LD Driver IC
B121 Series/B259 Series
LD
Laser
Beam
OPC
Drum
B121D915.WMF