The DC controller determines the duplexing cooling fan failure and notifies the video controller of "E805 (The duplexing cooling fan is faulty)", when the DU-

PLEXING FAN LOCK signal is kept for 10 seconds continuously.

2.8.3 Video Controller PCB

2.8.3.1 Outline

i-SENSYS LBP5300

The video 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 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.

2.8.3.2 Overview

/ i-SENSYS LBP5360

The video controller receives print information from external devices (e.g., host computer) through interface cables.

Such print information contains commands used to exchange printer status and unique information as well as PDL data.

The PDL data is converted into a display list by the display list generation circuit, and turned into bitmap data for output to the DC controller. A check may be made

on the printer status using an external device.

GDI data from application

Converts data into GDI-

compatible resource data

Canon Advanced Printing Technology

Creates bitmap image

Host computer interface

Printer interface

Engine

Printing

F-2-50

Host computer