130 Theory of operation EN
Basic sequence of operation
The operation sequences of this printer are controlled by the microprocessor on the engine controller
board. The purposes of periods from power on until the main motor stops after the completion of
printing are described below.
Table 33. Printer timing
Period Timing Purpose
WAIT From power on until the main
motor completes the initial
rotation.
Clears the drum surface potential
and cleans the transfer roller.
During this period, the printer
checks the toner level and the
presence of the cartridge.
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 sends
the TOP signal.
Stabilizes the photosensitive drum
sensitivity in preparation for printing.
Also cleans the transfer roller.
PRNT
(print)
After the end of initial rotation
until the top of the page
sensor detects the trailing
edge of the print media.
Forms images on the photosensitive
drum based on the video signals
from the formatter and transfers the
image to the print media.
During this period, the printer
checks the toner level.
LSTR
(last rotation)
After the primary voltage (DC)
turns 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 print media
and cleans the transfer roller.
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