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例1 放入碟片后不能播放,但进出盒显示功能均正常。分析与检修:经开机观察、激光头工作正常并有相应屏显,估计循迹、聚焦、操作系统的微处理器也正常。毛病恐怕还在主轴驱动电路,经测量主轴马达两端无电压,从马达驱动电路来看。四只功率管双双串联后再并联输出正负极电压,去驱动主轴电机正、反向线性运转,推动A面放碟;而Q8、Q9两管驱动反向运转,推动B面放碟。经测量无输出电压,怀疑推动IC
Example 1 can not play into the disc, but out of box display function are normal. Analysis and Maintenance: After the boot observation, the laser head is working properly and the corresponding screen display, tracking, focusing, operating system microprocessor is also normal. I am afraid the problem is still spindle drive circuit, measured by the voltage across the spindle motor, motor drive circuit from the point of view. The four power tubes are connected in series and then in parallel. The positive and negative voltages are output in parallel to drive the spindle motor to run in positive and negative directions, so as to push the A surface to place the disk. The Q8 and Q9 tubes drive in opposite directions to push the B surface to place the disk. No output voltage measured, suspected to promote the IC