论文部分内容阅读
(2)彩色通道故障的检修: TA8783彩色解码电路故障一般并不多,在这里介绍两个常见故障。例1 故障现象:无彩色检修:先检查制式(PAL/NTSC/SECAM)选择是否正确,若不正确先排除;若正确,则重点检查以下电路元件。 a.对于PAL制,检查TA8783(22)脚(PAL识别滤波器)外接电容C535是否开路;对于NTSC制,则检查(27)脚(NTSC识别滤波器)滤波电容C506;对于SECAM制,则检查(23)脚(SECAM识别滤波器)滤波电容C2207。 b).检查TA8783(25)脚(APC滤波器)外接APC滤波
(2) Color Channel Troubleshooting: TA8783 color decoding circuit failure is generally not much, here are two common faults. Example 1 Symptom: Colorless Maintenance: First check the standard (PAL / NTSC / SECAM) choice is correct, if not correct first; if correct, then focus on the following circuit components. a) For PAL, check if the external capacitor C535 of the TA8783 (22) pin (PAL identification filter) is open circuit; for NTSC, check the filter capacitor (C506) for the NTSC identification filter (NTSC); for the SECAM system, check (23) Foot (SECAM recognition filter) Filter capacitor C2207. b). Check TA8783 (25) pin (APC filter) External APC filter