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故障现象:示波屏上无光点故障分析:通过对整机电路分析,发现相关的电路有示波部分和垂直扫描、高压发生电路。(一)示波部分:1慢扫描电路工作是否正常。用万用表测6ＩＣ26#应有+75ｖ、-75ｖ的电压变化,如无:Ａ如总为正,则是6ＢＧ1、6ＢＧ2组成的ＰＮＰＮ环坏;Ｂ如总为负,则...
Symptom: There is no light spot fault analysis on the oscilloscope screen: Through the analysis of the whole circuit, it is found that the relevant circuit has oscilloscope section and vertical scan, high voltage generation circuit. (I) Oscilloscope section: 1 Whether the slow scan circuit is working properly. Use multimeter to measure 6IC26# should have +75v, -75v voltage change, if not: A if always positive, it is 6BG1, 6BG2 component PNPN ring bad; if B is always negative, then...