故障现象：灯源出现无规律闪烁现象，灯泡经常损坏。故障分析及维修：从故障现象分析，此例属于接触不良或虚焊、脱焊等所引起的可能性比较大。该机使用多年，灯座已严重氧化，怀疑故障是由于灯座接触电阻过大，接触点升温过高所致。换新灯座后，故障没有排除。重焊灯源供电电 Symptoms: Irregular flashing of the light source, the light bulb is often damaged. Fault analysis and maintenance: From the analysis of fault phenomena, this case is due to poor contact or the possibility of welding, welding off, etc. are relatively large. The machine has been used for many years, the lamp holder has been severely oxidized, and the suspected failure is due to the large contact resistance of the lamp holder and the high temperature of the contact point. After replacing the lamp holder, the fault was not eliminated. Heavy welding light source power supply