Printronix L5000 Series Maintenance Manual page 225

e. When the drum has made two revolutions, the discharge lamp light intensity
f.
2. Paper loading.
The tractor starts running to load the paper in such a manner that the paper
leading end is positioned 1/2 inch before the transfer point.
3. VSYNC (vertical sync) signal assertion.
This operation is performed to inform the controller of completed preprocessing
and to make a request for image data. At the same time, the main unit feed motor,
vacuum fan motor, and paper fan-folding unit (optional) start operations.
However, the main unit feed motor starts running at the high speed to render the
paper transport speed slightly higher than the drum rotation speed, thereby
avoiding paper slackness at perforation. Note that the drum motor, discharge
lamp, main charger, pre-charger, cleaning bias, magroll motor, sleeve motor, and
developing bias have already been turned ON in the process of drum cleaning
prior to printing (1).
4. LED exposure.
When the controller receives the VSYNC signal, it waits until the printer asserts
the page leading-edge margin SYNC (raster sync) signal, and then asserts the
video signal acquisition VGATE (video gate) signal and VDO (video) signal. The
VGATE signal is successively asserted for individual horizontal scan periods.
However, the VDO signal is asserted only for the pixels to be printed. When the
VDO signal is asserted, LED illumination occurs.
5. Tractor actuation.
The paper is transported to the transfer point when the drum exposure surface
arrives at the transfer point.
6. Transfer unit ascent.
When the paper leading edge arrives at the transfer point, the transfer unit
ascends.
7. Transfer/separation charger ON.
The back surface of the paper transported against the drum surface is charged to
transfer the toner image from the drum surface to the paper and separate the
paper from the drum.
Principles of Operation
drops.
Cleaning terminates when the drum makes another revolution.
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