B. Basic Operation Sequence
The operation sequence of this printer is controlled by the microcomputer on the engine con-
troller PCB. The purpose of each period from that the printer is turned ON until that the main
motor stops rotating after completion of printing is stated below. Refer to the appendix for the
detailed timing chart.
Table 2-1-1
CHAPTER 2
2 - 2
Purpose
Remarks
WAIT
( W A I T
period)
From power-ON until the end of
the main motor initial rotation.
Period
To clear the drum surface of
potential and to clean the
transfer charging roller.
From the end of the WAIT period
or the LSTR period until the
input of the pick-up command
from the interface controller.
Or, from the end of the LSTR
period until power-OFF.
From the input of the pick-up
command from the interface
controller until the paper
reaching the paper top sensor.
From the end of the initial
rotation until the primary
voltage going OFF.
From the primary voltage going
OFF until the main motor
discontinue rotating.
STBY
(STANDBY)
INTR
(INITIAL
ROTATION
period)
PRINT
(Print)
LSTR
(LAST
ROTATION
period)
To keep the printer ready to
print.
To stabilize the photosensitive
drum sensitivity in preparation
for printing. Also to clean the
transfer charging roller.
To form images on the
photosensitive drum based on
the VIDEO signals (/VDO, VDO)
input from the interface
controller and to transfer the
toner image onto the paper.
To deliver the last page. Also
to clean the transfer charging
roller.
When the pick-up
command is input from
the interface controller,
the printer enters the
INTR period immediately
after the end of the LSTR
period.
Detects whether the
cartridge is installed or
not.
