Epson Stylus Pro 9500 Service Manual page 59

EPSON Stylus Pro 9500
o
Paper Size Sensor Control - Front Edge Detection
Paper Front Edge
Detection
Carry out periodic
flushing (in the cap).
Stop the paper suction
fans.
Set the maximum backfeed
amount (200 mm).
Move the carriage to
a position 30 mm inside
the paper's left edge.
Is paper
present at the P_FRONT
sensor?
Set the maximum backfeed
amount / Backfeed the paper
to the position where the
P_FRONT sensor goes OFF.
Backfeed the paper a
further 40 mm.
Move the carriage
setting position.
Set the maximum backfeed amount
from the position where detection
starts, then backfeed the paper to the
paper's front edge "No paper"
detection position.
Does the
paper width detection
sensor detecting
"No paper"?
Detect the paper's front
edge.
Is the
paper's right top edge
being detected?
Move the carriage to a
position 30 mm inside
the paper's right edge.
Return
Figure 2-15. Paper Size Sensor Control - Front Edge Detection
Operating Principles
This processing needs to be
carried out after setting the
paper level.
(after carryingout left and
right edge detection
processing)
Solid Line: Paper
Broken Line: Printable Area
Left top edge.
Right top edge.
Error
Error Content:
"Set the paper correctly."
Component List & Illustrations
o
Paper Setting State Detection
If something abnormal is detected in the paper setting position check (left, right
edge and front edge detection) performed during initial processing when paper
is set in the printer, it results in an error with the message "Set the paper
correctly." being displayed.
n
Reference
The reference hole array for lining up the paper's left edge on the paper
guide L (the right edge of the paper when viewing from the front of the
printer) is made the mechanical reference home position for judging the
paper position.
n
Judgment Standard
Positional deviation of 10 mm or greater in the left and right directions from
the reference hole array (center) is regarded as an error.
o
Paper Skew Judgment
The paper skew (inclination to the side) judgment is made with the left and
right edge detection position during form feeding of each printed page as
the reference. Therefore, if skewing occurs with a certain printed page,
after that page is printed, an error occurs at the front edge position of the
next page to be printed (the rear edge position of the previous page) and
the message "Paper is skewed" is displayed.
n
Reference
Edge position detected during paper left, right edge detection.
n
Judgment Standard
If there is deviation to the left or right exceeding 3 mm between the front
edge and rear edge of the paper (the front edge of the next page), it is
regarded as an error.
Revision A
59