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除了此PLL伺服之外,CLV伺服电路从EFM信号中分离出7.35kHz的帧同步信号,与16.9344 MHz的晶振信号(KS5990B(53)脚输入),经分频后产生的7.35MHz基准信号进行相位比较,完成主轴电机的相位伺服。CLV伺服处理器将检测的相位差处理成误差信号,从KS5990B③脚(MDP)输出脉宽调制信号(PWM),送到KA8309B的(34)脚,经内部低通滤波,产生平滑的误差信号从(39)脚(SPDL)输出,再经Q208、Q209激励后控制主轴电机的转速,使旋转光盘的扫描速度再精确、更恒定。 KS5990B(28)脚(GFS)为帧同步信号锁定状态输出端,锁定时为5 V,失锁或停止时为0 V。(70)脚(PLCK)为VCO/2输出端,供维修调整时使用,该脚波形约为
In addition to this PLL servo, the CLV servo circuit separates the 7.35-kHz frame sync signal from the EFM signal and the 16.9344-MHz crystal signal (KS5990B (53) input) to produce a 7.35-MHz reference signal Compare, finish the phase servo of the spindle motor. The CLV servo processor processes the detected phase difference into an error signal and outputs a pulse width modulation signal (PWM) from the KS5990B pin (MDP) to the (34) pin of the KA8309B. The internal low-pass filter generates a smooth error signal (39) feet (SPDL) output, and then by Q208, Q209 motivation control spindle motor speed, the rotating disc scanning speed more accurate and more constant. The KS5990B (28) pin (GFS) is the frame sync signal lockout state output, 5 V on lock, or 0 V on loss of lock or stop. (70) feet (PLCK) for the VCO / 2 output for maintenance adjustments, the foot waveform is about