HP LaserJet 5000gn User Manual download pdf (Page 136)

Basic Sequence of Operation

5-45

Basic Sequence of Operation

The Formatter PCA and the DC Controller Board share information

during printer operation. The Interface PCA forms a link which

operates as a serial data bus. This allows printer status, command,

and dot-image data to be passed between the two PCAs. Table 5-1

shows the general timing of the printer events. The following events

take place during normal printer operation:

Table 5-1. Printer Timing

Period Timing Purpose Remark

WAIT From power on until the

Main Motor completes the

initial drive.

Clears the drum surface

potential and cleans the

transfer charging roller.

During this period,

the printer detects

the toner level and

the presence of the

cartridge.

STBY

(standby)

From the end of the WAIT

period until the /PRNT

signal 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.

Makes the printer ready to

print.

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 video controller,

and transfers the image to

paper.

During this period,

the printer detects

the remaining toner.

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HP LaserJet 5000gn User Manual Page 136

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