Controlling The Intensity Of Laser Light; Apc Control - Canon imageRUNNER 7095 Service Manual

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6.3.2 Controlling the Intensity of Laser Light

The machine uses APC control to make sure that the intensity of laser light remains at a specific level by

controlling the output of the laser diode of the laser driver.

For the control, the machine causes the Video controller to send the laser control signal (CTL0a, CTL1a,

CTL2a, CTL0b, CTL1b, CTL2b) to the laser drive IC on the laser driver PCB. As a result, the laser drive

IC is set to APC mode, thus forcing the laser diode (LD) to emit light. While the control is under, way, the

laser driver IC uses the photo diode (PD) to monitor the laser diode (LD), adjusting the output of the laser

diode until a specific level of intensity is reached.

SERVICE MODE:

COPIER > FUNCTION > LASER > POWER-A, B, C, D (activation for laser power adjustment)

Use this mode to turn on the laser when checking laser activation.

Laser driver PCB 1

Laser driver IC

Laser driver PCB 2

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