EN Chapter 5 Theory of operation 93
High-voltage power distribution
Figure 9. Engine controller board
In response to the instructions from the microprocessor (CPU:IC502) on the engine controller board,
the high-voltage power supply circuit applies high voltage to the primary charging roller, developing
cylinder, transfer roller, and the fuser film unit.
The circuit also detects the toner level and the presence or absence of the toner cartridge.
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