HP 6L, 5L manual Basic Sequence of Operation, Printer Timing, Refer to Timing Diagram on the next

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 which 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 of Main		Clear the drum surface potential and clean the
	Motor initial rotation.		Transfer Roller.
STBY (standby)	From the end of the WAIT or the LSTR period until		Maintain the printer in ready state.
	the input of the PRNT signal from the Formatter. Or
	from the end of the LSTR period until power OFF.
INTR (initial	From the input of the PRNT signal from the		Stabilize the photosensitive drum sensitivity in
rotation)	Formatter until the laser diode intensity has been		preparation for printing. Also clean the Transfer
	stabilized.		Roller.
PRNT	From the end of initial rotation until the Scanner		Form images on the photosensitive drum based on
	Motor stops.		the /VDO signal from the Formatter and transfer the
			image to paper.
LSTR (last	From the primary voltage (DC) OFF until the Main		Deliver the last sheet of paper. Also clean the
rotation)	Motor stops.		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 Timing Diagram on the next page

5 Functional Overview

Functional Overview 5 - 19