Xerox 8500DN Service Manual - Page 53
V. The power supply outputs + 3.3 V in ENERGY STAR mode. Fuse F1
UPC - 095205022063
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Theory of Operation The DC power supply generates + 3.3 V, +/- 15 V, and +/- 50 V. These voltages provide direct or regulated voltage values to various circuits in the printer. The power control board regulates +/- 15 V to +/- 12 and other voltages. The main board also has regulators providing + 5 V, + 2.5 V, and + 1.8 V. The power supply outputs + 3.3 V in ENERGY STAR mode. Fuse F1 provides protection for the switching power supply in the DC section. Warning Do not touch the power supply; AC line voltages are present. The power switch does not disconnect power from the printer. The power switch signals the supply and the printer logic to begin a shutdown sequence. F3 AC Line Line S1 Gnd Ref F2 Neutral AC Neutral D r u m P r e h t H 8 H 9 AC Line AC Neutral Low Switcher +3.3 V +15 V -15 V +50 V -50 V II I nn n kk k 43 2 Ir r n k 1 e s 2 e s 1 js r js I H 1 3H 1 2H 1 1H 1 0 Serial Control Interface H 4 H 3 H 2 H13 H H12 1 H11 H10 Vcc H9 H8 uProcessor REG H4 H3 H2 H1 Vss s8500-022 Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-21