Figure 1-4 Low voltage power supply 6 Chapter 1 Theory of operation ENWW C input Low-voltage power supply High-voltage power supply DC controller High-voltage Fuse Interlock switc circuit FU1 SW2 +24VC Fuser circuit /ZEROX Zerocross circuit Rectifying circuit +3.3V +3.3VA +3.3VA generation circuit +3.3VC +24VB Protection circuit +24V generation +24VB circuit +24VA +24VA RMT 24V _ Interlock switc SW1 +3.3VA +24VA Formatter +3.3VA +3.3VC Interlock switc SW1 Fuse FU1 Re c ctify ircu ing it Prot ci ection rcuit