Basic sequence of operation

The Formatter PCA and the DC Controller PCA share information during printer operation. The DC Controller-to-Formatter Connector (J201) forms a link that operates as a serial data bus. This allows printer status, command information, and dot-image data to be passed between the two PCAs.

Figure 5-7 shows the general timing of the printer events. The following events take place during normal printer operation:

Table 5-2 Printer timing

Period

Timing

Purpose

 

 

 

WAIT

From when the paper is inserted to the end

Clear the drum surface potential and clean

 

of Main Motor initial rotation.

the Transfer Roller.

 

 

 

STBY (standby)

From the end of the WAIT or the LSTR

Maintain the printer in ready state.

 

period until the input of the PRNT signal

 

 

from the Formatter. Or from the end of the

 

 

LSTR period until power OFF.

 

 

 

 

INTR (initial rotation)

From the input of the PRNT signal from the

Stabilize the photosensitive drum

 

Formatter until the laser diode intensity has

sensitivity in preparation for printing. Also

 

been stabilized.

clean the Transfer Roller.

 

 

 

PRNT

From the end of initial rotation until the

Form images on the photosensitive drum

 

Scanner Motor stops.

based on the /VDO signal from the

 

 

Formatter and transfer the image to paper.

 

 

 

LSTR (last rotation)

From the primary voltage (DC) OFF until

Deliver the last sheet of paper. Also clean

 

the Main Motor stops.

the Transfer Roller.

 

If another PRNT signal is sent from the

 

 

Formatter, the printer returns to the INTR

 

 

period. If not, it returns to the STBY period.

 

 

 

 

 

Refer to the Timing Diagrams on the following pages.

 

 

 

66 Functional overview

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