8) As the 6-facet mirror rotates and, as a result, the laser beams scan the surface of the photosensitive drum at a specific speed, a static image of multiple colors is

formed on the drum surface.

1 : The machine's BD circuit is found on its CBk driver PCB, and the BD signal occurs in keeping with the activation of the laser diode of the Bk driver.

2 : 1-Polygon 4-Laser Method

The term refers to a method in which a single polygon mirror is used for 4 laser beams. There are 4 laser diodes, the beams of which are directed to a multiple-facet

mirror mounted on a single scanner motor. The method inherently brings about a reduction in space.

6.2 Various Control

6.2.1 Controlling the Laser Activation Timing

6.2.1.1 Turning On and Off the Laser Light

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880

The laser light goes on and off when the laser diode of the laser driver PCB goes on and off at a specific intensity. The machine's laser driver PCB consists of 2

PCBs (Y/M laser driver PCB, C/Bk laser driver PCB), each with 2 systems of driver circuitry. The circuit turns on and off the laser light of individual colors ac-

cording to the combination of laser control signals (LC_CTL0/LC_CTL1) coming from the DC controller.

Laser control signal

LC_CTL0

[1] Y/M laser driver

[2] Y laser control signal

[3] M laser control signal

[4] C laser control signal

[5] Bk laser control signal

[6] C/Bk laser driver

In the forced outage mode, the intensity settings made through APC are cancelled.

MEMO: Controlling Laser Activation for a Resolution of 1200 dpi

To enable highly detailed reproduction of images, the machine switches the resolution in main scanning direction and sub scanning direction from 600 to 1200 dpi.

At such times, the laser output (intensity) is reduced by 1/2 for main scanning direction, while the speed is reduced by 1/2 for sub scanning direction.

LC_CTL1

forced off

APC

printing

standby

D-CON

[2] [3]

[1]

T-6-5

Operation

OFF

video signal input permitted