Moving The Lens; Lens Motor Control Circuit - Canon NP6251 Service Manual

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2. Moving the Lens

a. Moving the Lens in Y (vertical) Direction

The machine's lens is mounted on a lens stage, which is moved in Y (vertical

direction) when the lens Y motor (M5) is rotated.

b. Moving the Lens in the X (horizontal) Direction

The lens X motor (M4) mounted behind the lens stage is used to move the lens in X

(horizontal) direction.

The lens X motor (M4) and the lens Y motor (M5) are 4-phase stepping motors. Both

motors are controlled in the same way, and the lens X motor is discussed here.

The motor is controlled by the four types of motor drive signals from the DC controller

PCB: M4A, M4A*, M4B, M4B*. The direction of the motor is changed by changing the

timing at which these motor drive signals are sent.

To keep the lens X motor stationary, the lens X motor hold signal (X-HOLD) is

generated, thereby applying brakes in the form of a voltage lower than when rotating the

DC controller PCB

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Figure 3-203

CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

Lens (X) motor

Lens (Y) motor

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