Epson SEIJ98006 manual 16. CR Motor Excitation Mode and Usage, EPSON Stylus Color, Revision C

EPSON Stylus Color 900 Revision C

Unlike previous EPSON ink jet printers, the number of the phase excitation input ports in the motor drive IC of this printer has increased to 8. The previous micro step system used total of 4 phase excitation input signals for both phases A and B. (Stylus COLOR, Stylus PRO series, and Stylus PRO XL series are exceptional, since they transfer 4- bit serial data from ASIC to the motor driver.) This is because the micro stepping was controlled by the software only. On the other hand, LB1847 enables the 4W1-2 phase excitation using the hardware and is equipped with the necessary number of input ports (8 ports) for current setting signals. Among these input ports, 4 ports are allocated to each phase, A and B. Therefore, 16 types of current setting data can be constantly sent to the driver IC. The LB1847 controls the micro stepping system by exciting the corresponding phase based on the combinations of the setting signals sent from the ASIC.

Table 2-16 shows the excitation modes used for the CR motor and their usage.

Table 2-16. CR Motor Excitation Mode and Usage

Excitation mode	Usage	Minimum step
2-2 phase drive	LQ print mode	1/120" (0.212 mm)
1-2 phase drive	Not used	1/240" (0.106 mm)
W1-2 phase drive	Sort skipping	1/480” (0.053 mm)
	SLQ print mode
2W1-2 phase drive	Wiping	1/960" (0.026 mm)
	Capping
	Moving from the
4W1-2 phase drive	capping position	1/1920" (0.013 mm)
	Uncapping

Operating Principles Electrical Circuit Operation Principles 68