Power supply and control The power switch supplies ac power to the low-voltage power supply circuit when it is turned on. This circuit supplies dc voltage (+24V, +5V, +3.3V) to the main motor, laser/scanner unit, interlock switch, formatter, solenoids, paper feeder, high-voltage power supply, and formatter. The dc voltage supplied to the high-voltage power supply circuit is interrupted when the top cover is open. The overcurrent/overvoltage protection circuit in the low-voltage power supply automatically turns off the output voltage when an overcurrent condition occurs because of a short or abnormal voltage on the load side.
When input power is turned off then on, the protection circuit automatically resets. The low- voltage power supply circuit also contains a fuse that shuts off the power supply to the circuit when overcurrent conditions occur. See “Engine control system” on page 77. In response to the engine controller PCB, the high-voltage power supply circuit supplies dc and ac voltage to the various parts of the image formation system. Power supply PCB Cartridge Transfer High-voltage power supply charging roller circut Pressure roller Sensors Engine controller PCB Fuser assembly fuser control circut Low-voltage power ac input supply circut Figure 38.
Power supply PCB C7058-90936 Printer functionality and operation 79