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1.3 Flow of Print Signals

The following outlines the flow of signals as the printer receives data from the host

computer and prints it.

a) The data from the host computer that contains control commands will be fed into the

printer controller via the parallel interface, which is controlled by the printer

controller, on the control board. The printer controller sends this data on the

dedicated bus to store it in the receive buffer in the DRAM.

b) The data saved in the receive buffer will be sent to the MPU, where it is separated

into control commands and print data according to the data stored in the control

ROM. The control commands will be processed in the MPU.

c) The print data will be extracted into the DRAM's print buffer.

d) The printer controller, on receiving the Print Start Request, allows the DMA to

transfer the print data from the print buffer into the printer controller.

e) The printer controller then converts the print data into serial data and sends it as

print signal to the BJ head. The serial print signal will be converted into one column

of parallel print data inside the BJ head. The data, as the print control signal, will be

output under the control of the printer controller.

f) The MPU, while controlling the printer controller, control ROM, and motor driver, and

monitoring the status of the BJ head and printer, controls the entire printing

operation.

4-3

BJC-6000

Part 4: Technical Reference

Control Board

DRAM

Printer Controller

Receive Buffer

Print Buffer

BJ Head

Host

Computer

Control ROM

Motor Driver

Sensors

MPU

: Print Signals

: Control Signals

Figure 4-3 Flow of Print Signals

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 173 174

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Canon BJC-6000 Technical Information Seite 75