Low-voltage power supply The low-voltage power supply converts AC power from the power receptacle into DC power to cover the DC loads. Figure 1-12 Low-voltage power supply Power supply unit Low-voltage power supply DC controller Fuse (FU1) ACH Fuser control ACN Rectifying circuit Trans- former (T1) Rectifying circuit Control IC (IC1) Constant- voltage control photocoupler (PC2) Constant- voltage control circuit Rectifying circuit Abnormal status latch photocoupler (PC1) Protection circuit High-voltage power supply +24VB 100V: Open 200V:
Close Door open detection switch (SW101) /AC200 JP1001 ENWW Engine-control system 17 Po wer but (SW1) ton Fu (F Noise filter +5V 5VPRO +5V generation circuit +24VA +3.3V +3.3R Sleep switch 3 +24U +24R +24VA Sleep switch 2 /DOPEN +24VC Sleep switch 1 switch 1 +24VA Noise filter +5V generation cir +24VA +5V generation cir cuit Fu (F se U2)