Tektronix Phaser 840, Service Manual

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58 Phaser 840 and 850 Color Printers
6.
The x-axis motor activates to move printhead off its locking post. The x-
axis motor activates for three short bursts to ensure the printhead is in
its far-left travel (printhead home position). Then the x-axis motor is
reversed to move the printhead to the center the of the x-axis travel.
7.
The process motor is again activated to tilt the printhead forward into
the print position. The drum is rotated to sense it home position (The
Phaser 850 printer uses a slower rotation to find its home position).
8. A short cap/wipe/purge assembly motion is performed and the
assembly is returned to its home position.
9.
After the print engine is in a known, valid state, The AC heaters are
enabled and the front panel display shows the warm-up progress. The
Ready LED flashes; when warm-up completes, the Ready LED lights
solid.
10. The drum begins to rotate.
11. If the temperature of the printhead ink reservoirs or jetstack are below
the purge threshold, then the printer performs a head clean cycle.
a.
When the ink in the printhead is molten and printhead
temperatures are correct, the cap/wipe/purge assembly is
positioned to the purge position.
b. The printhead tilts forward against the cap/wipe/purge assembly
and a purge cycle begins.
c. The front panel indicates the printer is in a clean cycle.
d. A cleaning page is printed (Phaser 840 printer only).
12. The temperature of the printhead, drum and paper preheater are
allowed to stabilize at their operating temperatures and ink is melted if
needed.
13. A start page is printed (if enabled).
14. The front panel displays a message that the printer is initializing and
then ready.
The print engine is initialized.