Fujitsu MJA2500BH Maintenance Manual - Page 68
Servo Control, 4.7.1 Servo control circuit
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Theory of Device Operation 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 4.5 is the block diagram of the servo control circuit. The following describes the functions of the blocks: (1) MPU/HDC/RDC Head (2) Servo burst capture 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 4.5 Block diagram of servo control circuit 4-12 C141-E293