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EN AC and DC power distribution 137
3
HP LaserJet 4100 Series printer
AC/DC power distribution
In this circuit, the AC power input from the power receptacle is
converted into DC power. The DC power is supplied to the loads.
The AC power is supplied to the low-voltage power-supply circuit in the
engine controller board when the power switch (SW1) is turned on.
The AC power is converted into +24 VDC, +5 VDC, and +3.3 VDC in
the circuit. The +24 VDC is supplied to the main motor, scanner motor,
solenoids, clutches, and to the high-voltage power-supply circuit. The
+5 VDC is supplied to the laser and formatter, while +3.3 VDC is
supplied to the sensors and ICs on the engine controller board.
The +24 VDC is divided into +24 VA, which is constantly supplied from
the low-voltage power supply circuit, and +24 VB, which is interrupted
when the interlock switch (SW101) is turned off by opening the top
cover. The +24 VB is supplied to the high-voltage power-supply circuit
on the engine controller board and relay (RL102). It also functions as a
door-open detection signal (/DOPEN), so that the CPU detects an open
door.