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故障现象:进出仓、开机画面、面板显示均正常,放入碟片,10s(秒)后显示“NO DISC”。开盖观察,发现光头无初始化动作。分析与检修:能进出仓、有字符显示、画面正常,说明整机电源、复位、时钟应无问题。估计问题出在伺服电路(CXD3008)或驱动输出电路(BA6392)上。首先用R×1Ω档测进给电机两端,阻值正常且光头能来回移动;再测聚焦、循迹两线圈间电阻,阻值正常,且测量时物镜有上下、左右的相应动作;查看进
Symptoms: out of warehouse, boot screen, panel display are normal, into the disc, 10s (seconds) after the show “NO DISC”. Open lid observation and found no bald initialization action. Analysis and overhaul: can enter and exit the warehouse, a character display, the screen is normal, indicating the machine power, reset, the clock should be no problem. Estimated problems in the servo circuit (CXD3008) or drive output circuit (BA6392) on. First, use R × 1Ω file to measure and feed both ends of the motor, the resistance is normal and the optical head can move back and forth; measure the focus again, trace the resistance between the two coils, the resistance is normal, and the measurement objective lens has up, down, left and right corresponding actions; Enter