HP LaserJet Pro P1102 HP LaserJet Professional P1100 Series Printer - Service - Page 34
Low-voltage power supply, WARNING,
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Low-voltage power supply The low-voltage power supply (LVPS) converts ac input voltage to dc voltage. The LVPS has two fuses on the PCA. The LVPS 24 V output is interrupted to the fuser and the high-voltage power supply if the cartridge-door interlock switch (SW501) is in the off position (cover open). WARNING! The product power switch only interrupts dc voltage from the LVPS. The ac voltage is present in the product when the power cord is plugged into a power receptacle and the power switch is in the off position. You must unplug the product power cord before servicing the product. Figure 1-10 Low-voltage power supply (LVPS) AC input Engine controller Low-voltage power supply DC controller Fuse (FU201) Fuse (FU101) Rectifying circuit Cartridge-door switch (SW501) +24U Fuser unit High-voltage power supply +24V generation circuit Protection circuit Frequency detection circuit FREQSNS (220-240V model only) BSTSIG +24V +24V ON/OFF circuit 24VON +24P +5V generation circuit +5V +5R +3.3V generation circuit +3.3V ON/OFF circuit +3.3R +3.3V +3.3VON +3.3UON +3.3U Formatter Power switch (SW502) 16 Chapter 1 Theory of operation ENWW