Test Print Pattern - Epson ColorPage EPL-C8000 Service Manual

EPSON EPL-C8000

4.1.2 Test Print Pattern

The off-line diagnostic prints out the pattern shown below. (Four colors
are printed on one page - One color on each quarter of the page)
NOTE: The black portion of the test print may runover from the paper
depending on the printer specifications. (There is not the top
margin.)
NOTE: If Wide has been set in the Image Area Selection in the MCU
PWB EEPROM (NVM), the images are printed without top, right
and left margins.
NOTE: The straight lines in the paper transport direction jitter because
MCU PWB circuit clocks are used. Do not use the straight lines
to evaluate print quality.


Straight lines with 1 dot width in the laser beam scanning direction
are printed every 128 dots. (The line at the last part of each color
may not have the 128-dot interval.)


Straight lines with about a 5.49 dot width in the paper transport
direction are printed every 5.49 x 128 dots. (The lines at the right
and left edge in each color may not have the 5.49 x 128-dot
interval.)
Chapter 4 DIAGNOSTICS
Figure 4-2. Test Print Pattern
Rev. B
4-2