EN Chapter 5 Theory of operation 95
Engine controller system
The following systems and functions are controlled by the engine controller board:
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DC power distribution (+3.3 V DC, +5 V DC, +24 VA)
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Laser and scanner drive
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Paper-motion monitoring and control (photosensors and flags)
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Clutches (tray pickup and tray 1 feed)
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Engine test
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Motors (main drive, scanner, and fans)
Printer operations are controlled by the CPU on the engine controller board. When you press the
power button, the printer enters standby mode until it receives a print command or image data. The
CPU then sends the signals to drive internal components, such as laser diodes, motors, and
solenoids.
Figure 11. Engine controller board
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