Canon Color imageRUNNER LBP5280, Service Manual, Page: 39 / 284

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Technical Reference > Controller System > Main Controller > Outline
Technical Reference > Controller System > Main Controller > Outline
Main Controller
■ Outline
The main controller receives print information from external devices (e.g., host computer) by
way of interface cables. The information contains a CAPT command used to communicate
printer status and printer-specific characteristics and dot data, which is the result of
conversion of print data by the host computer.
The data is sent to the DC controller circuit for control of laser diode activation.
If properly connected with a bi-directional interface, an external device may be used to check
the printer status.
When printing is executed in a Microsoft Windows or Macintosh environment, CAPT (Canon
Advanced Printing Technology) serves to reduce processing speed and enhance the ease of
operation to provide a user-friendly printing environment. To that end, CPU is designed for the
following:
The following figure shows the block diagram of the DC controller.
• The print data from the application is turned into dot data and sent to the printer without
conversion into the printer's page description language (PDL).
• The printing environment may be checked and set on the host computer display by
responding to dialog boxes.
• The printer status is indicated on the host computer screen: print end time, print paper
movement, error status.
Canon Advanced Printing Technology
Monitors state of printer
Creates bitmap image
Converts data into GDI-
compatible resource data
GDI data from application
Analyzes resource data,
and develops it into print data
Displays on screen
Host computer interface
Printer interface
Engine
Printing
Printer status information
Host computer
Printer
Note
GDI (graphics device interface)
It is a graphical interface used in a Windows environment for printing and screen
display (also for the application being in use).
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