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[例1]故障现象 开机一切正常,工作一会儿自动停机,停机后再按待机触发按钮;有时能工作,有时无反应。 分析与检修 故障现象说明线路接触不良。打开机盖,通电,按电源开关,电源指示灯亮,再按待机触发按钮,发现继电器没有闭合,测试继电器工作电压为0V,进而发现灯盖开关处于开路状态。原来是灯盖板受长期高温变形,使灯盖开关顶不到位。卸下灯盖板,在顶杆上粘一块塑料,使灯盖将灯盖开关顶到位,故障排除。 [例2]故障现象 投影光栅较暗,分成上下两半部,上半部比下半部明显亮,有色彩正常的微弱画面。
[Example 1] Symptom Power everything is normal, work for a while to automatically shut down, stop and then press the standby trigger button; sometimes work, and sometimes no response. Analysis and troubleshooting shows the phenomenon of poor line contact. Open the cover, power, press the power switch, power indicator light, and then press the standby trigger button and found that the relay is not closed, the test relay operating voltage is 0V, and found that the lamp cover switch is open. The original lamp cover by the long-term high temperature deformation, the lamp cap switch is not in place. Remove the lamp cover plate, stick a piece of plastic on the ejector lever so that the lamp cover will be the top of the lamp cover switch, troubleshooting. [Example 2] Symptom The projection grating is dark, divided into upper and lower halves, the upper half is significantly lighter than the lower half, with a weak normal color screen.