Low-voltage power supply
The low-voltage power supply circuit converts the AC voltage that is input from the electrical
outlet to DC power and delivers it to each load in the printer.
Figure 5-8. Low-voltage power
supply circuit shows the low-voltage power supply circuit including the amount of voltage
supplied to each component.
The AC power is supplied to the low-voltage power supply by turning on the power supply
switch (SW301). The AC power is converted to the DC power that the printer requires:
● +24 V goes to the motors, solenoids, clutches, and the high-voltage power supply circuit.
● +5 V goes to the laser driver PCB, the beam detect PCB, and the formatter.
● +3.3 V goes to the formatter, the sensors, and the ICs in the DC controller PCB.
+24 V is divided into +24 VA, which is constantly sent from the low-voltage power supply
circuit, and +24 VB, which stops power supply when the top cover or the front cover is
opened. +24 VB goes to the fuser power supply circuit, high-voltage power supply circuit, the
clutch, and the motors and solenoid. +24 VB also functions as the door open detection
signal (/DOPEN). The CPU detects the door open with the signal.
Figure 5-8.
Low-voltage power supply circuit
ENWW Engine control system 139
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