Canon QY8-1360-000 manual 3 Print Signal Sequence, BJC-7100, Part 4 Technical Reference

BJC-7100 Part 4: Technical Reference

1.3 Print Signal Sequence

The following describes the sequence of signals from the time the host PC sends the print signals to the printer up to the point at which printing is performed.

a)The host PC sends print signals to the printer.

The print signals consist of print data and control commands.

b)The printer controller receives the print signals and temporarily stores them in the DRAM receive buffer.

c)The MPU fetches the print signals from the receive buffer and separates the print data from the control commands based on the program in the control ROM.

The MPU processes the control commands based on the program in the control ROM.

d)The MPU expands the print data in the DRAM print buffer.

e)The printer controller receives the request to start printing from the MPU and the print data is sent from the DRAM by DMA to the printer controller.

f)The printer controller converts the print data into serial data for the respective BJ heads and outputs this data to the BJ heads with control signals.

The drive circuits in the BJ heads convert the serial data to parallel format and control the output of inks onto the print paper as indicated by the control signals.

g)The MPU and printer controller sense the status of the BJ heads and printer and control the printer as a whole, including the motor drivers, etc.

	a			b	DRAM
Host PC
					Receive
				c
					Buffer
		Printer
		Controller
	f			d
					Print Buffer
				e
Drive	c	d	g	e
Circuits	g			c	Control ROM
BJ Head				g
• Black Head					Motor Driver
• Ink Optimizer Head		MPU
• Color Head
• Photo Head
: Print Data				g	Sensors
: Control
Commands and					Logic Board
Signals

Figure 4-3 Print Signal Sequence

The BJC-7100 supports the Canon extended (native) mode, but not emulation. The print signals sent from the host PC are therefore Canon extended mode signals converted by the printer driver.

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