【摘 要】
：
众所周知,4.43 MHz 晶振在彩电中与自动相位鉴相器(APC)等电路组成 PAL 制式副载波恢复电路。其损坏故障现象一般表现为黑白图像正常而无彩色。但在 TB1238AN 机心中,采用一
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众所周知,4.43 MHz 晶振在彩电中与自动相位鉴相器(APC)等电路组成 PAL 制式副载波恢复电路。其损坏故障现象一般表现为黑白图像正常而无彩色。但在 TB1238AN 机心中,采用一只4.43 MHz 晶振,便可得到 PAL、NTSC 制解词所需的彩色副载波,而其行振荡频率又受再生副载波控制,因而其损坏所
As we all know, 4.43 MHz crystal in the color TV with automatic phase detector (APC) and other circuits PAL subcarrier recovery circuit. The damage of the phenomenon is generally displayed as black and white images without color. However, in the TB1238AN movement, a 4.43 MHz crystal oscillator can be used to obtain the color subcarriers required by PAL and NTSC decoding words, and the line oscillation frequency is controlled by the regenerative subcarrier. Therefore,
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