Epson DFX-8500 service manual Curve Control, Nlq Hd

DFX-8500

Table 2-7 lists the CR motor drive modes.

Table 2-7. CR Motor Drive Modes

Division		Drive Mode		CR Motor Speed	Acceleration /	Constant
				(rpm)	Deceleration Control	Speed
					Curve	Control
					Note1)
Carriage moves		Super Draft		2800	Acceleration and	PI control
with printing.		Super Draft HD		2666	Deceleration 1
Note 2)		Draft		2100
		Draft HD		2000
		Bit image 1		1050	Acceleration and
		Bit image 2		1050	Deceleration 3
		Bit image 3		1050
		NLQ		1050
		NLQ HD		1000
		Super Draft X 1/3		888
		Bit image 4		933
		Draft X 1/3		666
		Bit image 1 X 1/3		555
		Bit image 2 X 1/3		500
		Bit image 3 X 1/3		444
		NLQ X 1/3		333
		Draft X 1/6		333
		Bit image 4 X 1/3		277
		Bit image 3 X 1/6		222
Carriage	moves	Home	position	500
without printing		seek
Note 3)		Paper	width	500
		detection seek
		Logical seek 0		2100
		Logical seek 1		1050
		Logical seek 2		333
		Measurement seek		-

Notes 1: Refer to Table 2-8.

Notes 2: This division applies to all printing modes. PI control oversees the constant speed. (Refer to page 2-27 for more information on PI control.) For increased throughput, the division Super Draft to Draft HD allows printing during acceleration and deceleration.

Notes 3: This division increases throughput when the carriage is moving and the printer is not printing.

The printer has three deceleration control modes. The degree of deceleration is determined by how the CR motor transistors are driven. Table 2-8 describes how the transistors are driven for each mode.

Table 2-8. CR Motor Drive Sequence

Carriage Transfer Direction	Driving Mode	Driver (Refer to Figure 2-19.)
		Q1	Q2	Q3	Q4
	Acceleration			ON	ON
Left -> Right	Deceleration 1		ON		ON
	Deceleration 2
	Deceleration 3	ON	ON
	Acceleration	ON	ON
Right -> Left	Deceleration 1		ON		ON
	Deceleration 2
	Deceleration 3			ON	ON

2-26 Rev. B