User manual

95.08.23.11.31
Color LaserWriter 12/600 PS Basics & Theory 1–141
The DC controller generates 8-bit video data signals (DV2-DV9) in
accordance with the video signals (
VDO0-VDO7) sent by the I/O
controller, and then sends them to the PWM-IC in the laser/scanner
assembly. The laser drive circuit turns the laser diode on and off in
accordance with the laser drive signal (internal signal in the
laser/scanner assembly) output from the PWM-IC, to generate the
modulated laser beam.
The laser beam emitted by the laser drive signal is scanned across the
photosensitive drum to create a latent image on the drum.
The latent image on the photosensitive drum is transferred to plain
paper. The paper is then delivered onto the face-down tray or the face-
up tray.
While printing a page, the DC controller checks whether or not the
/PRNT signal has been sent by the I/O controller.
If no /PRNT signal has been sent, the printer terminates the print
sequence with the current page and initiates the last rotations. At the
end of the last rotations, the printer enters the standby (
STBY) state.
On the other hand, if the /PRNT signal has been sent, the printer
continues the print sequence.