Xerox C2424 Service Manual - Page 57
supply outputs + 3.3 V in ENERGY STAR mode. Fuse F1 provides protection for - firmware
UPC - 095205676532
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Page 57 highlights
on a triac to activate a heater, it is turned on for only a fraction of a second. The main board must constantly readdress each heater it wants to remain on. This means if the print engine firmware should fail, the heaters automatically shut off. The printer is also protected by thermal fuses. A thermal fuse opens in the unlikely event of a "runaway" heater following a hardware failure. The drum and the paper preheater thermal fuses are located on the paper preheater. Additional thermal fuses are located on the printhead and on the ink melting elements. The DC power supply generates + 3.3 V, +/- 15 V, and +/- 50 V. These voltages are used directly or regulated to other voltage values as needed by 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. Theory of Operation 2-13