Epson AcuLaser C8500, Service Manual

Page: 272 / 570

EPSON AcuLaser C8500 Revision C
Chapter 4 Diagnostics 4-4
4.1.3 Test Print Patterns
The test print is done in the following patterns that each color appears in
each quarter area of the paper.
NOTE: Depending on the specifications, the image may protrude
beyond the paper leading edge, leaving no margin.
NOTE: If the MCU PWB EEPROM (NVM) [Image Area Selection] is set
to [Wide], the image is recorded onto paper without right and left
margins.
NOTE: A straight line extending in the paper transport direction, a clock
used for MCU PWB increases jitter, making an evaluation of the
quality of the image impossible.
†
In a straight line extending in the laser beam scanning direction, a
one dot line is printed at intervals of every 128 dots. On the back
edge of each color, the 128 dot interval may vary.
†
In a straight line extending in the paper transport direction, an
approximately 6 dot line is printed at every [approx. 6 dots x 128].
On the left and right edges of each color, the [approx. 6 dots x 128].
interval may vary.
Figure 4-2. Test Print Pattern