Service Manual
5
For transparency printing, the image is printed in the same manner. However,
the image is printed twice on the drum, the second image positioned precisely
over the first image before being transferred to the sheet of transparency film;
this increases image density.
For 600 x 300 dpi printing, each jet lays down 56 columns of ink drops spread
over a 224 pixel-wide field. The drum rotates 56 times to receive the pixel
columns. The same interlace method is used, except 14 pixel columns are
printed between the intermediate 2-step, 1-step and 2-step movements. A total
of 4,864 columns, each 3,134 dots tall, are laid down. The x-axis motor steps at
half the rate to double the resolution in the x-axis. Also, the printhead jets
output smaller, 600 dpi dots.
1 of 4
2 of 4
3 of 4
4 of 4
1 of 4
2 of 4
3 of 4
4 of 4
Output of four
side-by-side jets
Column of pixel dots
produced by four
adjacent jets are
interlaced together
for 300 dpi printing.
Each jet produces
28 pixel columns.
For 600 dpi printing,
each jet produces
56 pixel columns.
Columns of pixel
dots produced by
previous set of four
adjacent jets. Note
how the ending
columns of this set
interlace with
beginning columns
of the next set of
four jets.
9100-107
112 pixel-wide
field traveled by a jet
28 pixel
separation
between jets
2 Step
2 Step
1 Step
