Canon LBP3250 Series, Service Manual, Page: 39 / 98

Chapter 2
2-20
2.7 ENGINE CONTROL SYSTEM
2.7.1 Main Controller
2.7.1.1 General description
0019-9544
Main controller receives the print information from the external devices (computer etc.) through the interface cable.
Print information is divided into 2 types such as CAPT command data to handle the printer status or specific data and the dot data to printout.
After the main controller receives the dot data, it creates the video data and send it to the engine controller.
CAPT command data is the data to monitor the printer status from the external device using interface.
When this data arrives, the main controller communicates with the engine controller and sends the printer status to the external devices.
F-2-20
DRAM
USB interface
ASIC
CPU
Video interface
Engine controller
External device
EEPROM
Main controller
CAPT command data/dot data
Video command data/Command status data