Printing Operations - Printronix L5000 Series Maintenance Manual

Printing Operations

Start conditions
Printing starts when the controller asserts the PRNT (print) signal while the printer is
in the on-line idling state.
Description of operations
The printing operations for the fan-fold paper are different from those for the
cut-sheet paper. The following pages describe the printing operations for two such
different types of paper along with their timing diagrams.
If the controller detects an error occurrence by receiving the basic status information
returned from the printer during printing, it stops printing, identifies the error
condition by reading the error status information, and displays the descriptive error
information on the control panel.
In such an instance, the printer goes into the off-line idling state (in which the printer
waits for the error to be cleared). When the error is cleared, the printer effects
mechanical initialization and then goes into the on-line idling state.
Fan-fold paper printing
1. Drum cleaning (pre-printing).
When the PRNT signal is received from the controller, the printer carries out a
preprocessing operation which consists of drum cleaning and paper loading,
before asserting the image data (video signal) request VSYNC signal. In drum
cleaning, the following routine is executed.
a. The drum motor starts running, and the discharge lamp lights at the high
b. The main charger and pre-charger simultaneously turn ON when drum
c. The cleaning bias turns ON when the pre-charged drum surface area comes
d. The magroll motor (developing roller inner-pole magnet drive motor) and
5–64
power level.
rotation is stabilized.
into contact with the conductive brush.
sleeve motor (developing roller sleeve drive motor) start to turn ON the
developing bias when the main-charged drum surface area is in the proximity
of the developing roller.
Principles of Operation