EN Chapter 5 Theory of operation 91
Power supply system
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.
Figure 8. Low-voltage power supply circuit
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