Paper Pick - Tektronix Phaser 360 Service Manual

5
Theory of Operation
5-24 Phaser 360 Color Printer
2. Step 2 additional columns to the right.
3.
Print the 10th column, step 4 columns to the right, print 11th column,
step 4 columns to the right. Repeat until 9 columns are laid down
(total of 18 so far). The 18th column also includes a four step
movement to the right.
4.
Step 1 additional column to the right.
5. Print the 19th column, step 4 columns to the right, print the 10th
column, step 4 columns to the right. Repeat until another 9 columns
are laid down (27 total so far). The 27th column also includes a four
step movement to the right.
6. Step 2 additional columns to the right.
7.
Print the 28nd column, step 4 columns to the right, print the 29th
column, step 4 columns to the right. Repeat until the last 9 columns
are laid down for a total of 36 pixel columns.
The intermediate 2-step, 1-step and 2-step movement between the 9th and 10th
pixel columns, the 18th and 19th columns, and the 27st and 28nd columns,
respectively, allow the 36 pixels columns of each jet to properly interlace with
the 36 pixel columns of the other jets it is combined with. A total of
1565 columns, each 3,134 dots tall, are laid down.

Paper pick

To pick a sheet of paper, the process motor rotates clockwise, driving the process
drive belt and the compound gear counterclockwise. Rotating
counterclockwise, the compound gear turns and, in turn, engages a gear train
that rotates the pick roller clutch gear counterclockwise. The paper pick
solenoid 1 (mounted on I/O board 1) energizes for a moment, engaging the
paper pick clutch and allowing it to rotate one revolution. The pick roller rotates
and pulls a sheet of paper from the paper tray. The sheet of paper trips the paper
pick sensor to assure that the paper was picked from the tray. If the paper is not
sensed, the pick solenoid is energized, up to six times, to rotate the pick roller
again to attempt to recover from the mis-pick and pick the sheet of paper.
With the paper-pick sensed, the paper-feed electric clutch energizes to allow the
upper and lower paper-feed rollers to rotate and carry the sheet of paper to the
paper pre-heater. At this point, the paper stops at the entry to the paper
pre-heater, tripping the paper pre-heater entry sensor on the left end of the
paper preheater. The paper also trips the paper width (A/A4-size) sensors on
the right end of the paper preheater to verify that the width of the paper is
within the printer's specifications. At this point, the process motor is stopped to
wait for more ink deposition on the drum.
When ink deposition is about 95% complete, the process motor is activated to
bring the sheet of paper through the paper pre-heater and to the transfix
position. The paper preheater heats the paper to improve ink transfer. The
leading edge of the sheet of paper trips the paper preheater exit sensor as it
passes out of the paper preheater.