Functional Overview
DC Controller/Power System
Power System (on DC Controller PCA)
The ac, dc and high voltage power supply circuits are all contained
within the DC Controller PCA.
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AC Power Distribution
The ac power circuitry, located on the DC Controller PCA, supplies
ac voltage to the DC Power Supply whenever the printer’s power
cord is connected to the ac power source. (The power switch must
o
be turned ON in the LaserJet 4P/4MP.) A toner cartridge must be
installed and the top door closed before voltage is supplied to the
High Voltage Power Supply or Main Motor drive circuitry.
DC Power Distribution
The DC Power Supply circuitry, located on the DC Controller PCA,
generates +5 V dc, and +12 V dc, which is used as follows:
+5 V dc: Formatter PCA
Photosensors
DC Controller Circuitry
Laser/Scanner Assembly
+12a V dc:
High Voltage Power Supply
(a=after switch) Main Motor
+12b V dc: Solenoids
(b=before switch) Laser/Scanner Assembly (to Fan)
The Power System Block Diagram is illustrated in Figure 5-4.
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