HP 1100AHP - Manual (Page 60)

58 Functional Overview C4224-90962
Basic sequence of operation (formatter to printer)
The formatter and the ECU share information during printer operation. The ECU-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. The following
events take place during normal printer operation:
Period Purpose Remarks
WAIT
From the power-ON until the end of
the main motor initial rotation.
To clear the drum surface of
potential and to clean the transfer
charging roller. Detects whether the cartridge is installed or
not.
STBY
(Standby)
From the end of the WAIT period or
the LSTR period until the pick-up
command is input from the video
controller. Or, from the end of the
LSTR period until power-OFF.
To keep the printer ready to print.
INTR
Initial Rotation Period
After the pick-up command has
been input from the video controller
until the paper reaches the paper
top sensor.
To stabilize the photosensitive
drum sensitivity in preparation for
printing. Also to clean the transfer
charging roller.
PRINT
(Print)
From the end of the initial rotation
until the primary voltage goes OFF.
To form images on the
photosensitive drum based on the
VIDEO signals (/VDO, VDO) input
from the video controller and to
transfer the toner image onto the
paper.
LSTR
(Last Rotation Period)
After the primary voltage goes OFF
until the main motor stops rotating.
To delivery the last page. Also to
clean the transfer charging roller. When the pick-up command is input from
the video controller, the printer enters the
INTR period immediately after the end of the
LSTR period.