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132 Chapter 3 – Power supply EN
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.