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一台花都 VCD 机,放入碟片开通电源,约3 min(分钟)左右因读不出碟片目录而停机。一般情况下,不读碟现象大部分因激光头老化、损坏所致。更换激光头无效,根据平时检修经验,认为伺服电路中的贴片电容漏电、断裂现象比较多,仔细检测未发现上述现象。经仔细观察发现,放入碟片后,碟片转动忽快忽慢,并有打碟现象,从为伺服电路供电系统电源有故障。该机电源电路如图1所示。
A Huadu VCD machine, put the disc on the power, about 3 min (minutes) because the CD can not read the disc directory and down. Under normal circumstances, most of the phenomenon does not read disc due to laser head aging, damage caused. Replacing the laser head is invalid, according to the usual maintenance experience, that the servo circuit chip capacitor leakage, breakage phenomenon is more, careful detection found no such phenomenon. After careful observation found that into the disc, the disc suddenly blinking, and playing disc phenomenon, from the power supply system for the servo circuit power failure. The machine power circuit shown in Figure 1.