operational mode of the laser driver circuit, and the LASER LIGHT INTENSITY SWITCH signal (LDPWRH) for switching the laser light intensity to each laser

driver IC (IC1, IC2). The laser driver IC controls the laser according to the combination of each signal.

2.3.2.2 Image masking control

/ i-SENSYS LBP5360 / i-SENSYS LBP5300

The image masking control is to regulate laser beam emission in non-image area except during the unblanking interval.

The DC controller puts the LASER CONTROL signal into LDOFF mode and turns the laser diodes OFF intentionally, while the laser beam scans the non-image

area except during the unblanking interval. This is called the image masking status, and the laser diodes do not emit light during this status period even if the VIDEO

signals are sent. The timing to start the image masking control depends on the paper size information sent from the video controller. (Note that this printer cannot

detect the paper size in the cassette.)

2-4

LDPWRH

LD2CTRL0

LD2CTRL1

LD2CTRL2

VDO21,/VDO21

VDO22,/VDO22

LD2PDOUT

LD2CTRL0

LD2CTRL1

LD2CTRL2