HP LaserJet M4345 MFP - Engine-control system; DC controller PCA

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.
Figure 4-1 DC controller PCA block
diagram on page 118 illustrates the DC controller function.
ENWW Engine-control system 117
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