Epson 7600, 9600 service manual Operating Principles Print Mechanism Components 111

EPSON Stylus Pro 7600/9600 Revision A

„Simplified detection sequence for left and right edges (skew check)

When the paper width detection function is turned off, left and right edge detection (skew check) is not carried out.

Error display:

1:Set the paper correctly

2:PAPER NOT STRAIGHT

CHECK	Transition to this sequence is allowed only at inter-page skew
POINT	checking (at cut/eject, etc.) At paper initial, transition to “Paper size
	detection sequence (left and right edges)” (p.109) takes place.

	Solid Line: Paper
Right edge	Broken Line: Printable	Left edge
	Area
detection position		detection position
	Previously determined
	paper width X mm

a

Note "*1": Paper presence position = 215.4 mm Paper absence position = 132.9 mm LED turns off upon completion of skew check.

	"*2": Printing area MIN position
Left and right edge	=142.9 mm –4.0 mm (Reserved width)
	A4 size (210.0 mm) – 20.0 mm = 190.0
detection start	mm

CR moves to the paper presence position (100CPS).

Flashing during acceleration on Fl_Box

Moving to paper absence position. Threshold value is

calculated during moving to paper presence position. After determination of threshold value, edge sensor LED is kept on.

*1

CR moves to the position "printing area MIN position + A4

size - 20 mm = 328.9 mm" (350CPS) *2

While monitoring the edge sensor output, CR moves toward

the home to the printing area MIN position (350CPS).

Paper absence detected		No
?	Yes
From the position where the sensor output has changed, CR
			Edge sensor LED is turned off.
moves by 2 mm outward (240CPS).
			Error 1
While monitoring the edge sensor output, CR moves toward
the home at 5 cps. The position where paper absence is
detected is judged to be the left edge position of the paper.
The paper width determined by the previously executed left
and right edge detection (at paper initial or skew check) is
added to the left edge position. The resultant position is
regarded as the paper right edge position.

Paper right edge	Yes
position deflected by 3 mm from previously
determined position?
No
Paper left edge	Yes
position deflected by 3 mm from previously
determined position?
No

Edge sensor LED is turned off.	Edge sensor LED is turned off.
Return	Error 2

Figure 2-9. Simplified Detection Sequence for Left and Right Edges

(Skew Check)

Operating Principles Print Mechanism Components 111