Panasonic UF-890 Service Manual page 247

6.2.12 Interlock Safety Circuit
This safety circuit turns OFF the +24 VDC supply voltages when the Printer Cover is opened. When the
Printer Cover is opened, the microswitch(es) on the ILS PC Board are de-actuated, turning OFF +24 VDC
to the Printer Drive Circuit, the HVPS, and the Paper Feed Solenoid Circuits, turning OFF the +5 VDC
supply voltage for the Laser Driver Circuit on the Laser Unit.
+24V
LVPS
Converter
Interlock Safety Circuit Block Diagram
+24V
+24V
+24VD
Rush Current
Protection Circuit
+24VM
pMPOW
+24VM
+24VM
DC/DC
L+5V
(LPC PCB)
247
Printer
Cover
ILS PCB
Printer Motor
HVPS
Paper Feed Solenoid
LSU