Epson Stylus Pro 7600 Service Manual page 111

EPSON Stylus Pro 7600/9600
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
Transition to this sequence is allowed only at inter-page skew
C H E C K
checking (at cut/eject, etc.) At paper initial, transition to
P O I N T
detection sequence (left and right edges)" (p.109)
Right edge
detection position
Operating Principles
"Paper size
takes place.
Solid Line: Paper
Broken Line: Printable
Left edge
Area
detection position
Previously determined
paper width X mm
Print Mechanism Components
Left and right edge
detection start
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) *
While monitoring the edge sensor output, CR moves toward
the home to the printing area MIN position (350CPS).
Paper absence detected
?
Yes
From the position where the sensor output has changed, CR
moves by 2 mm outward (240CPS).
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
position deflected by 3 mm from previously
determined position?
No
Paper left edge
position deflected by 3 mm from previously
determined position?
No
Edge sensor LED is turned off.
Return
Figure 2-9. Simplified Detection Sequence for Left and Right Edges
(Skew Check)
Revision A
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
=142.9 mm –4.0 mm (Reserved width)
A4 size (210.0 mm) – 20.0 mm = 190.0
mm
2
No
Edge sensor LED is turned off.
Error 1
Yes
Yes
Edge sensor LED is turned off.
Error 2
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