HP 3150 EN - Manual (Page 85)

EN Basic sequence of operation (formatter-to-printer) 83
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 which
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:
Table 12. Timing
Period Purpose Remarks
WAIT (WAIT period)
From power ON to the end of the
initial rotation of the main motor. To clear the drum surface of its
charge and to clean the transfer
charging roller.
STBY (STANDBY)
From the end of the WAIT period or
the LSTR period until the input of
the /PRNT signal from the video
controller. Or from the end of the
LSTR period until power OFF. To maintain the printer in ready
mode.
INTR (INITIAL ROTATION period)
From the input of the /PRNT signal
from the video controller until the
end of the APC operation. To stabilize the photosensitive
drum sensitivity in preparation
for printing. Also to clean the
transfer charging roller.
PRINT (print)
From the end of initial rotation until
the motor stops. To form images on the
photosensitive drum based on
the /VDO signal from the video
controller and transfers the
toner image to paper.
LSTR (LAST ROTATION period)
From when the primary high
voltage (DC) goes OFF until the
main motor stops. To deliver the last page. Also to
clean the transfer charging
roller. The printer enters the
INTR period when the
/PRNT signal is sent
from the video controller.