Printronix L5535, Руководство по обслуживанию

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II–166
Chapter 8
Operational Sequences
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.
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.
8. Separation claw drive activation.
In the cut sheet paper mode, the separation claws at the transfer/
separation section exit are used to properly separate each sheet of paper
from the drum. Whenever the paper leading edge arrives at the claw
section, the claws are solenoid-driven so as to mechanically separate the
paper from the drum.
9. Fuser ON.
After the paper is separated from the drum upon completion of toner
image transfer, the paper comes underneath the fuser, and then the
halogen lamp glows steadily and the flash lamp intermittently lights.
Steps (4) through (6) and (8) are repeated as needed to cover all the
pages to be printed. Note, however, that the conditions indicated in steps
(7) and (9) continue. If the controller does not assert the PRNT signal for
the next page within the specified time after VSYNC signal assertion, the
pickup motor does not start operating and printing terminates in the
following sequence.
10. VSYNC signal assertion stopped.
If the PRNT signal is not asserted by the controller at the time of LSCA
signal assertion, the printer concludes that printing is terminated and
stops VSYNC signal assertion for the next page.
11. Cut sheet paper feed motor deactivation.
When the last page passes through the paper timing sensor section, the
cut sheet paper feed motor stops.
12. LED exposure stopped.
When VSYNC signal assertion is terminated, the VDO and VGATE
signals are no longer fed. Therefore, LED exposure also terminates.
13. Transfer/separation charger OFF; separation claw drive deactivation.
The separation claw drive system stops when the leading edge of the last
page passes through. The transfer and separation chargers turn OFF
upon completion of last-page transfer and separation.
14. Fuser OFF.
When the last page passes underneath and beyond the fuser, the fuser
turns OFF.
15. Main unit feed motor deactivation; transfer unit descent.
When the last page is output, the main unit feed motor and vacuum fan
motor stop and the transfer unit descends.