photosensitive drum. The modulated laser beams generate the latent electrostatic image on the
photosensitive drum according to the image data signals that are received from the dc controller PCA.
Laser/scanner control
The laser/scanner-control circuit on the laser driver PCA turns the laser diodes on and off according
to image-data signals that the dc controller PCA sends. The dc controller PCA sends image-data
signals VD01/VD01,VD02, and /VD02 and the laser-control signals CNT0, CNT1, and CNT2 to the
logic circuit on the laser driver PCA. The laser-control signals control laser emission, automatic
power control (APC), horizontal-synchronization control, and image-mask control.
Figure 5-8 Laser-
control-circuit block diagram illustrates the laser-control system.
96 5 Theory of operation
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