Printronix L5535, Руководство по обслуживанию

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Printing Operations
II–165
16. Drum cleaning (post-printing).
In this step, the following routine is executed.
a. The main charger, magroll motor, sleeve motor, and developing bias
turn OFF.
b. When the drum has made two revolutions, the precharger and
cleaning bias turn OFF.
c. When the last-cleaned drum surface area passes through the
discharge lamp section, the discharge lamp turns OFF and the drum
motor stops.
17. Printer switched to online idling state.
Cut Sheet Option Paper Printing
1. Drum cleaning (pre-printing).
The same operations are performed as stated under fanfold paper
printing.
2. Transfer unit ascent.
When pre-printing drum cleaning is completed in the cut sheet paper
mode, the transfer unit ascends.
3. Cut sheet paper output path opening.
The paper output gate solenoid moves downward to open the cut sheet
paper output path.
4. Paper loading.
The cut sheet paper pickup motor and feed motor start running to load the
cut sheet paper from the cassette into the transport path. When the cut
sheet paper is detected by the paper registration sensor located between
the supply and feed rollers, the registration clutch operates at regular
intervals to activate the registration roller assembly. When the paper
passing through the registration roller section is detected by the paper
timing sensor, the main unit feed motor (running in the low speed) and
vacuum fan motor start running so that LED exposure begins after an
elapse of a predetermined time.
The cut sheet paper pickup motor stops after supplying each sheet of
paper. When printing a number of successive pages, this motor starts
again after verifying the PRNT signal for the next page. Therefore, while
the printer is printing one page after asserting its VSYNC signal, it is
necessary that the controller assert the PRNT signal for the next page.
5. VSYNC (vertical sync) signal assertion.
This operation is performed to inform the controller of completed
preprocessing and to make a request for image data. Note that the drum
motor, discharge lamp, main charger, precharger, cleaning bias, magroll
motor, sleeve motor, and developing bias have already been turned ON
in the process of drum cleaning prior to printing (1).
6. 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