Lens Motor Drive Circuit - Canon NP6330 Service Manual

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CHAPTER 3 EXPOSURE SYSTEM

2. Lens Motor Drive Circuit

Figure 3-203 shows the circuit used to control the lens motor (M3).

The lens motor is a 2-phase stepping motor, and is controlled by the lens motor drive

pulse command (LEA, LEB) and the lens motor hold command (LEHLD) generated by

the DC controller. The direction of its rotation, on the other hand, is controlled by

changing the output timing of the LEA command and the LEB command.

The LEHLD command remains '1' while the lens motor is rotating, applying 24 V to

the motor. The LEHLD command remains '0' while the motor is at rest, applying 5 V to

the motor by way of applying brakes.

Motor driver 1 PCB

Figure 3-203

Drive circuit

CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

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