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Basic Sequence of Operation 5-49
Basic Sequence of Operation
The Formatter PCA and the Engine Controller Board share
information during printer operation. The Interface PCA forms a link
which operates as a serial data bus. This allows printer status,
command, and dot-image data to be passed between the two PCAs.
Table 5-1 shows the general timing of the printer events. The following
events take place during normal printer operation:
Table 5-1. Printer Timing
Period Timing Purpose
WAIT From power on to the end of Main
Motor initial rotation.
Clears the Drum surface potential
and cleans 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.
Maintains the printer in ready state.
INTR (initial rotation) From the input of the PRNT signal
from the Formatter until the Engine
Controller outputs the TOP signal.
Stabilizes the photosensitive Drum
sensitivity in preparation for
printing. Also cleans the Transfer
Roller.
PRNT After the end of initial rotation until
the top of the page sensor detects
the trailing edge of the paper.
Forms images on the
photosensitive Drum based on the
/VDO signal from the Formatter
and transfers 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.
Delivers the last sheet of paper and
cleans the Transfer Roller.