Fujitsu MCJ3230AP manual Control circuit section block diagram

Models: MCJ3230AP

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General Description

The positioner is driven by a linear voice coil motor. A pulse-width modulation (PWM) is adopted as a driving system and realizes low power consumption and high-speed access.

(4) Separate optical sections

The optical head section is separated in such a way that the fixed optics section is separated from the moving optics section to minimize seek time and positioning error. (See Subsection 1.2.4 for the fixed optical section.) This reduces the weight of the moving parts.

The fixed optics section consists of the laser diodes, collimator lens, and optical detector.

The fixed optics section includes a laser diode for recording and playback, and transmits one laser beam to the head actuator.

(5) Panel

The central part of the panel is hollowed out deeply to provide pushing finger space for inserting the cartridge, thereby facilitating the insertion.

The panel is also simply designed by making the eject button and LED light emitting part integral with each other.

1.2.4 Control circuit section

Figure 1.4 is the block diagram of the control circuit section.

ATAPI I/F

Main control

MPU

ODC

DSP

User Logic

LSI i/f

F-ROM

D-RAM

Drive

Read Amp

Power Amp

Filter

Sensor

Motor Driver

DE

Head

Laser Diode

Photo Diode

APC Amp

LPC Amp

Servo AGC

Actuator

Focus Act.

Track Act.

Spindle Motor

Temperature Sensor

Bias Coil

Eject Motor

Cartridge Sensor

Figure 1.4 Control circuit section block diagram

1-8

C156-E205-01EN

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Image 34
Fujitsu MCJ3230AP manual Control circuit section block diagram