Canon LBP-1210 Service Manual page 106

CHAPTER 2
III. VIDEO CONTROL SYSTEM
A. Outline
The video control system is configured with the interface controller, which sends various instruc-
tions to the engine controller in the engine control system through the video interface, and the
intermediate PCB. The video interface implements communications between the interface con-
troller and the engine controller.
The interface controller constantly monitors the printer using the video interface. When the
printer is ready to print, the interface controller outputs a print command to the engine con-
troller through the video interface. Also, the interface controller sends the video signal to the
laser driver PCB. Receiving the print command, the engine controller turns laser ON and OFF,
based on the video signal.
This section describes the types of the interface signals exchanged between the engine con-
troller and interface controller, and discusses the operational sequence using these signals.
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