Controlling The Intensity Of Laser Light; Controlling The Laser Scanner Motor; Controlling The Laser Shutter - Canon imageRUNNER 2530 Service Manual

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Technology > Laser Exposure System > Various Controls > Controlling the Laser Shutter
MEMO:
Regarding BD signal formation
The BD sensor of the BD PCB receives light from laser C only, and is free of light from
laser D, i.e., the BDsignal is generated based on the light from laser C.

Controlling the Intensity of Laser Light

APC Control
The machine monitors the laser light that is emitted to the built-in photo diode of laser diode
and adjusts the laser to appropriate intensity.

Controlling the Laser Scanner Motor

Laser Scanner Motor Control
From when the laser scanner motor starts and the laser scanner motor reaches the number
of target rotation to before image formation starts, the machine controlsthe rotation speed by
referring to the laser scanner motor rotation speed signal (FG signal).During image formation,
it controls the laser scanner motor rotationspeed based on BD signal.Laser scanner motor
rotation speed is controlled by speed-up signal (ACC signal) and speed-down signal (DEC
signal).
J208
DC Controller PCB
2 Technology > Laser Exposure System > Various Controls > Controlling the Laser Shutter

Controlling the Laser Shutter

Laser Shutter Control
When the right door opens, laser shutter will be closed by laser shutter link that works in
conjunction with the right door and the laser light is blocked. Also, whenthe front door or right
door open is detected, laser scanner motor and the laser emission will be turned OFF.
DOOR CLOSED
[3]
[1] Laser shutter
[2] Laser shutter link (works in conjunction with the right door)
F-2-51 F-2-51 [3] Laser unit
[1]
[2]
DOOR OPEN
[1] [3]
[2]
2-32
[1]
[2]
F-2-52 F-2-52
2-32