66 Functional overview EN
Basic sequence of operation
The Formatter PCA and the DC Controller PCA share information during printer operation. The DC
Controller-to-Formatter Connector (J201) forms a link that operates as a serial data bus. This allows
printer status, command information, and dot-image data to be passed between the two PCAs.
Figure 5-7 shows the general timing of the printer events. The following events take place during
normal printer operation:
Table 5-2 Printer timing
Period Timing Purpose
WAIT From when the paper is inserted to the end
of Main Motor initial rotation.
Clear the drum surface potential and clean
the Transfer Roller.
STBY (standby) From the end of the WAIT or the LSTR
period until the input of the PRNT signal
from the Formatter. Or from the end of the
LSTR period until power OFF.
Maintain the printer in ready state.
INTR (initial rotation) From the input of the PRNT signal from the
Formatter until the laser diode intensity has
been stabilized.
Stabilize the photosensitive drum
sensitivity in preparation for printing. Also
clean the Transfer Roller.
PRNT From the end of initial rotation until the
Scanner Motor stops.
Form images on the photosensitive drum
based on the /VDO signal from the
Formatter and transfer the image to paper.
LSTR (last rotation) From the primary voltage (DC) OFF until
the Main Motor stops.
If another PRNT signal is sent from the
Formatter, the printer returns to the INTR
period. If not, it returns to the STBY period.
Deliver the last sheet of paper. Also clean
the Transfer Roller.
Refer to the Timing Diagrams on the following pages.
Service.book Page 66 Thursday, September 14, 2000 11:15 AM
