Basic operation
All high-level MFP processes are routed through the formatter, which stores font information,
processes the print image, and communicates with the host computer.
The basic MFP operation can be divided into five systems:
■ The engine control system, which includes the power supply and dc controller PCA
■ The laser/scanner system, which forms the latent image on a photosensitive drum
■ The image formation system, which transfers a toner image onto the print media
■ The pickup and feed system, which consists of various rollers and transports the media through
the MFP
■ The scanner system, which scans data and sends it to the formatter for copying or for sending to
e-mail
Sequence of operation (printer)
A microprocessor on the dc controller PCA controls the operating sequence. The tables in this
section describe the basic operating sequence from when the MFP power is turned on until the final
printed page is delivered to an output bin. For information about the timing of the basic operating
sequence, see
General timing chart.
Period (sequence) Description
Waiting The period of time from when the MFP power is turned on until the main motor or drum
motor begins to rotate. During this time the transfer roller is cleaned and the
microprocessor on the dc controller PCA checks to determine if a print cartridge is installed
in the MFP.
Standby The period of time from the end of the waiting sequence or from the end of the last rotation
until a print command is received from the host computer or until the MFP power is turned
off. The message Ready appears on the control-panel display.
Initial rotation The period of time when the photosensitive drum is stabilized to prepare for printing.
Print The period of time from the initial rotation until the positive bias on the transfer-charging
roller is turned off.
Last rotation The period of time from the completion of the print job until the main motor or drum motor
stops. The final page of the job is delivered to an output bin and the transfer roller is
cleaned. If another print job is immediately detected (sent by the host computer), then the
MFP returns to the initial rotation period. If no print jobs are waiting, then the MFP returns
to the standby period.
78 5 Theory of operation
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