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九、开关电源部分波形开关电源部分波形,如图14所示。(a)A3机芯电源定时电容C514开路时V513基极波形;(b)北京8303彩电Q801基极正常波形与一种故障波形比较;(c)如意彩电Q90l集电极正常波形与一种故障波形比较。图14开关电源部分的一些故障波形示图(b)(c)(a)(正常)(正常)(故障)(故障)十、预中放和伴音部分波形这里主要介绍彩电预中放管的波形测量和伴音部分的波形测量。1.彩电预中放管波形的测量彩电预中放管是为了补偿声表面波滤波器的插入损耗而设置的,放大的信号是图像中频信号,频率
Nine, part of the waveform switching power supply switching power supply part of the waveform, shown in Figure 14. (a) V513 base waveform when A3 core power supply timing capacitor C514 is open; (b) Beijing base color TV 830 Q801 normal waveform compared with a fault waveform; (c) Wishful color TV Q90l collector normal waveform and a fault waveform Compare Figure 14 switching power supply section of some fault waveform (b) (c) (a) (normal) (normal) (fault) (fault) Ten pre-release and the sound waveform of the part here mainly introduces the color TV pre-release Waveform measurement and waveform measurement of the sound section. 1. Pre-TV tube discharge waveform measurement Pre-discharge tube is to compensate for the SAW filter insertion loss set, the amplified signal is the image IF signal, the frequency