Basic sequence of operation

The formatter PCA and the dc controller board share information over a serial data bus. This allows printer status, command, and dot-image data to be passed between the two PCAs. Table 27 shows the general timing of the printer events. The following events take place during normal printer operation:

Table 27. Basic sequence of operation

Period

Timing

Purpose

Remark

WAIT

From power on until the main

Clears the drum

During this period, the

 

motor completes the initial

surface potential and

printer detects the toner

 

drive.

cleans the transfer

level and the presence

 

 

charging roller.

of the cartridge.

 

 

 

 

STBY (standby)

From the end of the WAIT

Makes the printer ready

 

 

period until the /PRNT signal

to print.

 

 

is input from the formatter, or

 

 

 

from the end of the LSTR

 

 

 

period until the /PRNT signal

 

 

 

is input from the formatter or

 

 

 

until the power is turned off.

 

 

 

 

 

 

INTR (initial rotation)

After the /PRNT signal is input

 

from the formatter until the dc

 

controller outputs the /TOP

 

signal.

Stabilizes the sensitivity of the photosensitive drum in preparation for printing, and cleans the transfer charging roller to stabilize the transfer high voltage.

PRINT

From the end of the INTR

 

period until the top of the

 

paper sensor detects the

 

trailing edge of the paper.

Forms an image on the photosensitive drum according to the /VDO and VDO signals input from the formatter, and transfers the image to paper.

During this period, the printer detects the remaining toner.

LSTR (last rotations)

After the primary dc voltage

 

turns off until the main motor

 

stops.

Delivers the final page and cleans the transfer charging roller.

As soon as the /PRNT signal is input from the formatter PCA, the printer enters the INTR period.

Q1860-90918

Chapter 5 Functional information 101

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HP 5100LE manual Basic sequence of operation Period Timing Purpose Remark