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在1996年东芝公司向我国推出了一款新型的VCP—K3C 型卡拉 OK 录/放像机,它采用了 V3机芯及先进的中置结构,磁带运行平稳保证了图像的清晰度。另外该公司还把专业用的“高净化磁鼓用在 VCP—K3C 当中。信噪比也比一般家用录像机提高了2 dB—3 dB。该机另外还使用了先进的 I~2C 总线。现将该机的电源电路工作原理及故障检修实例分述如下。一、电源电路工作原理分析该机的开关电源电路如图1所示。市电110 V～240 V 电压由 P801送到主电路板
In 1996, Toshiba introduced a new type of VCP-K3C karaoke recorder / player to China. It uses the V3 movement and the advanced centering structure, and the smooth running of the tape ensures the sharpness of the image. In addition, the company also used the professional ”High Purification Drum" in the VCP-K3C with a signal-to-noise ratio of 2 dB-3 dB higher than that of a typical home video recorder, which also uses an advanced I-2C bus. Now the machine power supply circuit working principle and troubleshooting examples are described below.A, power supply circuit analysis of the working principle of the machine switching power supply circuit shown in Figure 1. Mains 110 V ~ 240 V voltage from the P801 board