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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 which
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:
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 Timing Diagram on the next page
Table 5-2
Printer Timing
Functional Overview 5 - 19