Engine-control system
The control system consists of three PCAs: the power supply PCA, the power-factor correction PCA,
and the dc controller PCA. This system controls the laser/scanner, image-formation, and pickup-and-
feed systems. The microprocessor on the dc controller PCA controls the operating sequence of the
printer.
DC controller PCA
The dc controller PCA controls the operation of the MFP and its components. The dc controller PCA
starts the MFP operation when the MFP power is turned on and the power supply sends dc voltage
to the dc controller PCA. After the MFP enters the standby sequence, the dc controller PCA sends
out various signals to operate motors, solenoids, and other printer components based on the print
command and image data that the host computer sends. For a description of dc controller PCA
connectors, see
DC controller connections. Figure 5-1 DC controller PCA block diagram illustrates
the dc controller function.
84 5 Theory of operation
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