Printing (450 X 800 Dpi) - Tektronix Phaser 360 Service Manual

7. Print the 43nd column, step 4 columns to the right, print the 44th
column, step 4 columns to the right. Repeat until the last 14 columns
are laid down for a total of 56 pixel columns.
The intermediate 2-step, 1-step and 2-step movement between the 14th and 15th
pixel columns, the 28th and 29th columns, and the 42st and 43nd columns,
respectively, allow the 56 pixels columns of each jet to properly interlace with the
56 pixel columns of the other jets it is combined with. A total of 4864 columns,
each 3,134 dots tall, are laid down.

Printing (450 x 800 dpi)

450 x 800 dpi printing is nearly identical to the 300 x 300 dpi printing process
except the horizontal steps are 2/3 the distance of 300 dpi steps and each jet
prints 42 pixel columns. When printing, the printer performs a "four-jet
interlace" in which, each jet lays down 42 pixel columns. Each jet lays down one
pixel column for each drum rotation (42 revolutions total). Each jet travels
horizontally the distance of 169 pixels to lay down its 42 pixel columns within
that 229 pixel-wide field. The 229 pixel-wide field of each jet overlaps the
229 pixel-wide field of six other jets; this is where interlacing occurs. To lay
down its 42 pixel columns, each jet follows this sequence:
1. Print 1st column, step four columns to the right, print 2nd column,
step four columns to the right. Repeat until 21 columns are laid down.
The 21th column also includes a four step movement to the right.
2. Step 1 additional column to the right.
3.
Print the 22nd column, step 4 columns to the right, print the 23th
column, step 4 columns to the right. Repeat until the last 14 columns
are laid down for a total of 42 pixel columns.
The intermediate 1-step movement between the 22th and 23th pixel columns
allow the 42 pixels columns of each jet to properly interlace with the 42 pixel
columns of the other jets it is combined with. A total of 3648 columns, each 8357
dots tall, are laid down.
Fast Color printing (193 x 300 dpi)
Fast Color printing is nearly identical to the 300 x 300 dpi printing process except
the horizontal steps are wider than the size of 300 dpi steps and each jet prints
fewer pixel columns. When printing, the printer performs a "four-jet
interlace."in which, each jet lays down 36 pixel columns. Each jet lays down one
pixel column for each drum rotation (36 revolutions total). Each jet travels
horizontally the distance of 73 pixels to lay down its 36 pixel columns within
that 73 pixel-wide field. The 73 pixel-wide field of each jet overlaps the
73 pixel-wide field of six other jets; this is where interlacing occurs. To lay down
its 36 pixel columns, each jet follows this sequence:
1. Print 1st column, step four columns to the right, print 2nd column,
step four columns to the right. Repeat until 9 columns are laid down.
The 9th column also includes a four step movement to the right.
Theory of Operation
Service Manual 5-23
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