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例1 一台乐声TC—2060D彩电出现图像无彩色故障。图像无彩色主要是由于三个色差信号同时丢失造成。这种故障主要发生在色解码IC601(AN6252N)部分(电路如图1所示)。用示波器测得IC601第(14)脚无色同步选通脉冲,第(16)脚的11V_(P-P)行同步信号幅度只有0.5V_(P-P)。
Example 1 a music TC-2060D color TV image without color failure. Achromatic images are mainly due to the loss of the three color difference signals at the same time. This failure occurs mainly in color decoding IC601 (AN6252N) part (circuit shown in Figure 1). The oscilloscope measured IC601 (14) feet synchronous strobe pulse, the (16) pin 11V_ (P-P) line synchronization signal amplitude of only 0.5V_ (P-P).