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130 Chapter 3 – Power supply EN
AC and DC power distribution
HP LaserJet 1200 Series printer
The AC, DC, and high-voltage power-supply circuits are all contained
within the ECU.
AC power distribution
The AC power circuitry supplies AC voltage whenever the power cord is
connected to the AC power source. The AC voltage is distributed to the
DC power supply circuitry and to the AC driver circuitry, which controls
AC voltage to the fuser-assembly heating element.
DC power distribution
The DC power distribution circuitry, located on the ECU, distributes
+3.3 VDC, +5 VDC, and +24 VDC as follows:
+3.3 VDC: Formatter
Laser/beam-detect circuitry ECU
Photosensors
+5 VDC: Formatter
ECU
Laser/beam-detect circuitry
+24 VDC: Motor
Exhaust fan
Laser/scanner motor
Document-scanner motor
Solenoid
Formatter (routing only)
High-voltage power supply
Fuser-safety circuit