Service manual

Basic sequence of operation (formatter-to-printer)
The microprocessor (CPU) on the ECU controls the printer operation sequence. The following events
take place during normal printer operation.
Table 4-1 Basic sequence of operation
Period Purpose Remarks
WAIT: After the product is turned on until
the end of the initial rotation of the main
motor.
To clear the drum surface of potential
and to clean the primary charging roller.
Detects whether or not the cartridge is
installed.
STBY (Standby): From the end of the
WAIT period or the LSTR period until the
pickup command is sent from the
formatter. Or, from the end of the LSTR
period until the product is turned off.
To pause until the product is ready to
print.
INTR (Initial Rotation): After the pickup
command has been sent from the
formatter until the media reaches the top-
of-page sensor (PS801).
To stabilize the photosensitive drum
sensitivity in preparation for printing, and
to clean the primary 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) sent from the formatter and
to transfer the toner image onto the
media.
LSTR (Last Rotation Period): After the
primary voltage goes OFF until the main
motor stops rotating.
To deliver the last page, and to clean the
primary charging roller.
When the pickup command is sent from
the video controller, the printer enters the
INTR period immediately after the end of
the LSTR period.
60 Chapter 4 Operational overview ENWW