HP LaserJet 5000n Period, Timing, Remark, Purpose, Table 5-1.Printer Timing

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	From the end of the WAIT
(standby)	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	After the /PRNT signal is
rotation)	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.

EN Basic Sequence of Operation 5-45