Epson Stylus Pro 7400 Service Manual page 120

EPSON Stylus Pro 7400/7800/9400/9800
Paper Skew Check
Loaded paper is fed by the set amount (one bus) at one time. Positions of the paper
edge before and after the feeding is detected by sensors and checked if they are the
same or not.
Specify a paper feeding amount (length) after the printer finishes a paper initialization
operation. The left edge of the paper is detected by the Edge sensor and the difference
from the value detected before feeding is displayed.
If a paper detection error before or after the feeding occurs, or if the Rear sensor detects
that the paper is not on it during the feeding, a paper error is displayed on the LCD. In
such case, press any of the buttons to exit the menu.
NOTE 1: A criterion for judging if paper is skewed or not is determined in the
firmware according to the left edge position detected by the Edge sensor.
2: If the Paper Check LED flashes or lights with paper loaded, a paper
detection error is occurring. Release and reset the Paper Set Lever to clear
the error.
3: If "99.999 mm" is displayed as the result, check the following items and retry
the operation. They can cause the invalid result.
• Position of left or right edge of paper changed 3 mm or more.
• The distance between the K nozzle row and the right edge of paper
when the Carriage is in its home is less than 142.0 mm. (the paper is
too close to the home side.)
• The Paper Set Lever is released or the front cover is opened while
feeding paper.
Product Description
Band Feed and Top & Bottom Margins Adjustment
An amount (length) of paper feeding at a time (Band feed), and the top, bottom, and
side margins can be adjusted.
A band is printed on each top and bottom sides of paper. By entering the interval
between the two bands, the PF encoder resolution set in the firmware is automatically
adjusted.
The top and bottom adjustment can be made by entering measured distances between
Edge sensor and printhead, between the cutter and printhead, and between Edge sensor
and printhead.
Figure 1-37. Between Edge sensor and printhead (paper feed direction)
Table 1-62. Positions of Printed Lines
360dpi-based
Intervals
0
1417
2834
Control Panel
Adjustment Items
Band feed adjustment: adjusts paper feed
amount
T & B adjustment
• Top margin
Between Edge sensor and printhead (paper
feed direction)
• Bottom margin
Between cutter and printhead (Carriage
moving direction)
• Left and right margin
Between Edge sensor and printhead (paper
feed direction)
On a millimeter 360dpi-based
basis Intervals
0 8583
Approx. 100 9921
Approx. 200 11338
Revision B
On a millimeter
basis
Approx. 600
Approx. 700
Approx. 800
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