Canon BJC-2000 Series Service Manual - Page 70

Part 4: Technical Reference, 2 Print Signal Flow

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Part 4: Technical Reference BJC-2000 1.2 Print Signal Flow The print signal flow from when the printer receives the print data to when printing is executed is described below. a) The printing information, including control signals output by the host computer, is loaded through the parallel interface into the MPU & printer controller on the logic board. The printing information is separated into control commands and print data based on the data stored in the control ROM. The control commands are processed in the MPU & printer controller. The print data is stored in the DRAM print buffer. b) The MPU & printer controller converts the print data into serial data as print drive signals and outputs the serial data to the bubble jet head. In the bubble jet head, the print data is converted from serial signals to parallel print data for each printed line. Printing is executed while the printer controller is controlled by the print control signals. c) The MPU & printer controller monitors the status of the bubble jet head and printer and uses the control ROM and motor drivers to manage all printing driver controls. Host a Computer DRAM a b Print Buffer BJ Head b MPU & Printer Controller a c c Logic Board Control ROM Motor Drivers : Print signal : Control signal c Sensors Figure 4-2 Printing Signal Flow 4-2

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Part 4: Technical Reference
4-2
BJC-2000
1.2 Print Signal Flow
The print signal flow from when the printer receives the print data to when printing is
executed is described below.
a)
The printing information, including control signals output by the host computer, is
loaded through the parallel interface into the MPU & printer controller on the logic
board.
The printing information is separated into control commands and print
data based on the data stored in the control ROM.
The control commands are
processed in the MPU & printer controller.
The print data is stored in the DRAM
print buffer.
b)
The MPU & printer controller converts the print data into serial data as print drive
signals and outputs the serial data to the bubble jet head.
In the bubble jet head,
the print data is converted from serial signals to parallel print data for each printed
line.
Printing is executed while the printer controller is controlled by the print
control signals.
c)
The MPU & printer controller monitors the status of the bubble jet head and
printer and uses the control ROM and motor drivers to manage all printing driver
controls.
DRAM
a
b
a
b
:
a
c
c
c
Host
Computer
BJ Head
MPU &
Printer Controller
Print Buffer
Logic Board
Control ROM
Motor Drivers
Sensors
:
Print signal
Control signal
Figure 4-2 Printing Signal Flow