一台富丽VIP-3000HCMKⅡ放像机,故障现象为放像时主导轴时转时停,周期约一秒,很有规律,走带时带速明显偏快,发出“伍一”“伍一”的声音,快进,倒带等则较为正常,看不出有什么问题。从现象看,属主导轴伺服失控故障。结合本机特点,主导轴速度伺服的路径可用图1表示。从图1上可以看出,从主导轴电机输出的FG信号,经伺服处理中心IC_(401)处理,由脚输出,经误差控 A magnificent VIP-3000HCMK Ⅱ player, the phenomenon of failure to play when the capstan switch to stop, the cycle of about one second, very regular, with a significantly faster speed with the band, issued a “Wu a” “Wu a” sound , Fast forward, rewind, etc. are more normal, do not see any problems. From the phenomenon of view, is a captive servo control failure. Combined with the characteristics of the main shaft speed servo path can be shown in Figure 1. As can be seen from Figure 1, the output from the capstan motor FG signal, the servo processing center IC_ (401) processing, output by the foot, the error control