Mechanical Initialization - Printronix L5000 Series Maintenance Manual

Mechanical Initialization

Start conditions
Mechanical initialization starts when either of the following situations occurs:
The mechanical initialization routine is called by the MPU initialization routine.
The controller asserts the engine operation request command for a reset
(mechanical initialization).
Note that the engine operation request command for a reset is asserted when the
printer switches from the off-line idling state to the on-line idling state.
Description of operations
In the mechanical initialization process, execution of the following routines takes
place. As is the case with MPU initialization, however, if the controller confirms an
error occurrence by receiving the basic status information returned from the printer, it
asserts the error status read command to identify the error condition and displays the
relevant error information on the control panel. For the timing of individual
operations, see the timing diagrams presented at the end of this chapter.
1. Sensor output check.
Checkout is performed to see whether the transfer unit is placed in the lower
position. If not, the transfer unit is moved into the lower position. Also, the cutter
is checked to see whether it is in its home position. If not, an error occurs.
2. Drum cleaning.
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
5–60
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