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黑白电视机常见故障很多,现将部分常见故障的检查与调试根据通用电路作一介绍。 1.图像不清晰、模糊,灵敏度低,伴音不正常。这种故障主要出在公用通道,它包括高频头、中放、视频检波和前置视放。中放电路(图1)的检查,可用BT—3扫频仪。扫频仪有一个输出电缆,使用时,要串联一个1000PF的电容,两个输入电缆:一个是检波探头;另一个是开路输入电缆。
A lot of common black and white TV failures, now part of the common fault inspection and debugging according to a common circuit for an introduction. 1. Image is not clear, fuzzy, low sensitivity, sound abnormalities. This failure is mainly in the public channel, which includes the tuner, the release, video detection and pre-amp. In the discharge circuit (Figure 1) inspection, available BT-3 scanner. The scanner has an output cable that, when used, has a 1000PF capacitor in series with two input cables: one for the detector probe and one for the open input cable.