Controlling The Laser Scanner Motor; Outline - Canon imageRUNNER 7095 Service Manual

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6.3.3 Controlling the Laser Scanner Motor

The machine controls the laser scanner motor so that the motor rotates at a specific speed using its motor

speed control mechanism and reference signal generation mechanism found inside the Video controller

The motor speed control mechanism detects the speed detection signal (FG, BD), and compares it against

the reference signal generated by the reference signal generation mechanism, thereby controlling the ac-

celeration signal (ACC) and the deceleration signal (DEC) to make sure that the motor rotates at a specific

The machine checks different references for speed detection to suit the state of the printer unit, ultimately

reducing the length of time used to control the scanner motor speed. The FG signal is a detection signal

used to roughly adjust the scanner motor speed. The BD signal, on the other hand, is a detection signal

used to finely adjust the motor speed.

E110 (scanner motor error)

The FG signal is not detected a specific period of time after the scanner motor starts up.

The FG signal is not detected while the scanner motor is rotating at a constant speed.

Laser driver PCB 1

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Imagerunner 7105 Imagerunner 7086