Fujitsu MHT2030AT Manual/User Guide - Page 65
Servo Control, 4.7.1 Servo control circuit
UPC - 683728090579
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4.7 Servo Control 4.7 Servo Control The actuator motor and the spindle motor are submitted to servo control. The actuator motor is controlled for moving and positioning the head to the track containing the desired data. To turn the disk at a constant velocity, the actuator motor is controlled according to the servo data that is written on the data side beforehand. 4.7.1 Servo control circuit Figure 4.6 is the block diagram of the servo control circuit. The following describes the functions of the blocks: (1) Head (2) Servo burst capture MPU MPU core Position Sense SVC (3) DAC (4) Power Amp VCM current (7) CSR VCM CSR: Current Sense Resister VCM: Voice Coil Motor (5) Spindle motor control (6) Driver Spindle motor Figure 4.6 Block diagram of servo control circuit (1) Microprocessor unit (MPU) The MPU executes startup of the spindle motor, movement to the reference cylinder, seek to the specified cylinder, and calibration operations. Main internal operation of the MPU are shown below. C141-E192-02EN 4-13