HP LaserJet 2200 Series printer
•The power switch supplies AC power to the low-voltage power- supply circuit when it is turned on. This circuit supplies DC voltage (+24 V, +5 V, +3.3 V) 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 and 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.
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.
132 Chapter 3 – Power supply | EN |