HP LaserJet P2015 Series

Timing

Sequence of operation

Operation sequences are controlled by the microprocessor on the DC controller. Table 5-1 Sequence of operation on page 73 describes engine operations for each period of a print operation.

Table 5-1

Sequence of operation

Name Timing Purpose

WAIT

INTR (initial rotation)

PRINT

From power-on until the end of the main motor initial drive

Detects presence of a print cartridge. Clears potential from the drum surface and cleans the transfer roller.

STBY (standby) From the end of the WAIT or LSTR period until either a print command is sent from the formatter or the power is turned off.

Prepares the printer to receive print commands

From the time of the print command until the pickup solenoid is turned on.

Prepares the photosensitive drum for printing.

LSTR (last rotation)

From the end of the INTR period until the primary high-voltage is turned off.

From the end of the PRINT period (when highvoltage is turned off) until the main motor stops rotating.

Forms the image on the photosensitive drum and transfers the toner image to the media.

Delivers the last page of a print job.

After LSTR, the printer either returns to STBY or, if another print command was sent from the formatter, enters INTR.

Power-on sequence

Table 5-2

Power-on sequence

Step

5

6

7

8

1

2

3

4

9

10

Action

Power-on

CPU initialization

Video interface communication start

Check sensors for residual media

Main motor initial drive

Fuser heater initial drive. The fuser heater reaches a surface temperature of 100°C.

Laser/scanner motor initial drive

High-voltage control

Detect presence of a print cartridge

Clean the transfer roller after the primary charging ac bias is turned on

Failure/abnormality check: detect laser/scanner failure, fuser failure, and open covers

Communication with the memory tag

ENWW Timing 73