- HP LaserJet Printer Service Manual

EN DC Controller/power system 55
DC Controller/power system
The DC Controller PCA coordinates all print engine activities, drives the laser, and coordinates print
data from the Formatter PCA with the image formation process. The DC Controller also includes both
AC and DC power supply and distribution circuitry. The DC Controller controls the following systems
and functions:
l Print Engine Control
• Laser and Scanner Drive
• Paper Motion Photosensors (Paper Out, Paper Registration, and Paper Exit Sensors)
• Motor
l Power System
• AC Power Distribution
• DC Power Distribution
• Overcurrent/Undervoltage Protection
• SleepMode
• High Voltage Power Distribution
Figure 5-2 shows the various DC controller loads.
Figure 5-2 DC Controller loads
CPU
DC ControllerFormatter
PCA
Laser/Scanner
Assembly
Memory
I/O
Laser Diode
Delivery
Paper
Sensor
LV Power
Supply
AC Driver
HV Power
Supply
Main Motor
Drive
Fuser
Drive
Control Panel
Power
Supply
Charging Roller
Developing Roller
Bias
Toner Car tridge
Transfer Roller
Motor
Fusing Assembly
Sensors/Solenoid
Service.book Page 55 Thursday, September 14, 2000 11:15 AM