Basic operation
All high-level product processes are routed through the formatter, which stores font information,
processes the print image, and communicates with the host computer.
The basic product 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
product
●
The scanner system, which scans data and sends it to the formatter for copying or for sending to e-
mail
Sequence of operation (product)
A microprocessor on the DC controller PCA controls the operating sequence of the product. The tables
in this section describe the basic operating sequence, from when the product power is turned on until
the final printed page is delivered to an output bin.
Period (sequence) Description
Waiting The period of time from when the product 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 product.
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 product power is turned
off.
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 product
returns to the initial rotation period. If no print jobs are waiting, then the product returns to
the standby period.
2 Chapter 1 Theory of operation ENWW
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