Ricoh TH-C1b - Ld Safety Switch; Front Door; Circuit

10 February 2005 LASER EXPOSURE
6-45
Detailed
Descriptions
6.8.5 LD SAFETY SWITCH
Front Door
The LD safety switch is on the upper end of the front door. This switch is linked to
the following covers:
Front door
Right cover
The switch prevents laser emission if any of the above covers is opened (when, for
example, you remove jammed paper or replace a consumable).
Circuit
The LD safety switch is on the 5V circuit leading to the LD unit. Between the switch
and the unit, the line has 2 contacts on the front door and on the right door (series
circuit). When either of the covers is opened, the power supply is interrupted,
preventing laser emission.
LDDR
LD
Control
IC
5VLDS
5VLD
Door SW
BICU
+5V
+5V
PSU
B156D500A.WMF