Safety Interlock - Kyocera Mita FS-6750 Service Manual

Safety interlock

For safety purpose, micro switches are provided to sense that either the top (toner
access) or side (drum access) cover is open. These switches, when the applicable
cover is open, open and disconnect the DC power to the laser scanner as follows.
The laser emission is deactivated when either cover is open in the following system.
The interlock power supply of +5V is generated by downverting the +24V DC power
using the 3-terminal regulator. The +5V DC is used as the power supply for the
scanner APC circuit that is cut out when either cover is open. At the same time as
the cover is open, the control signal output for the scanner unit, that is derived
from the engine gate array, is set to the high-impedance state.
Figure 4.15 Interlock system
Top cover switch
Left cover switch
+24VDC
4-26
Engine controller system
+24VDC
Engine
3-term.
g/a
regulat.
6
Top cover switch
Left cover switch
Operation theory
Polygon mot.
+5VDC
APC
FS-6750