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近年来,我国沿海一带一些厂家大量拼装的VCD中,较多地采用了三星PCB-802伺服板,该板主要集成电路有:KA9201(RF放大)、KA8309B(伺服信号处理)、KS5990B或KS9211B(DSP芯片)、KS56C820-69A(CPU)共4块,各驱动电路均采用分立元件。有关该板的电路图参见“家电维修”杂志1999年5期每期一图,主要集成电路实测数据见本文后期附表1～4。一、原理简介 (一)RF放大电路 1.RF信号放大:光敏管A、B、C检测出的反射光
In recent years, China’s coastal areas along a number of manufacturers assembled a large number of VCD, more use of Samsung PCB-802 servo board, the board of the main integrated circuits: KA9201 (RF amplification), KA8309B (servo signal processing), KS5990B or KS9211B DSP chip), KS56C820-69A (CPU) a total of 4, the drive circuits are used discrete components. The circuit diagram of the board, see “Home Appliances Maintenance” magazine in 1999 a period of a chart, the main IC measured data see later in this Schedule 1 ~ 4. First, the principle of introduction (A) RF amplifier 1. RF signal amplification: light-sensitive tube A, B, C detected by the reflected light