故障現象：

Symptom:

接修了一臺內窺鏡冷光源。故障現象是：開機有電源指示，散熱風扇工作正常，機內有連續的“哧哧哧”高壓拉弧聲，沒有“啪、啪、啪”的放電聲，氙燈沒有工作，打開機器后發現放電管內好似燒焦發黑，再次開機放電管一直連續放電拉弧。

An endoscope cold light source was repaired. The fault phenomenon is: there is a power indicator when the machine is turned on, the cooling fan works normally, there is a continuous "Chi Chi" high-voltage arc sound in the machine, there is no "Pa, PA, Pa" discharge sound, and the xenon lamp does not work. After turning on the machine, it is found that the discharge tube is scorched and blackened. When the machine is turned on again, the discharge tube has been continuously discharging and arcing.

工作原理：

working principle:

氙燈的發光是利用正負電觸發氙氣與稀有金屬起化學反應而發光的。根據氣體放電的工作原理，對照電路分析氙燈弧光放電起輝原理：在氙燈工作的電路中并聯有貯能電容，當電壓直接加到氙燈兩端電上，且充電電壓小于燈的自閃電壓時，氙燈不導電。

The luminescence of xenon lamp uses positive and negative electricity to trigger the chemical reaction between xenon and rare metals. According to the working principle of gas discharge, the starting principle of arc discharge of xenon lamp is analyzed by comparing with the circuit: there are energy storage capacitors in parallel in the circuit of xenon lamp. When the voltage is directly applied to both ends of xenon lamp and the charging voltage is less than the self flashing voltage of the lamp, the xenon lamp is not conductive.

電路輔助有高壓觸發電路，打開電源開關，變壓器產生的高壓使火花隙放電，產生的23000V左右的觸發脈沖電壓加到氙燈上，使氙燈電離，在燈內形成長火花，這個火花在燈兩端電壓上迅速成高密度的弧光放電，產生強的閃光，此時貯能電容上的電壓通過氙燈放電以維持氙燈工作。當電容電壓由于放電而下降到一定程度后，主電路加上，保持氙燈工作于弧光放電狀態。

The circuit is assisted by a high-voltage trigger circuit. Turn on the power switch. The high voltage generated by the transformer discharges the spark gap. The generated trigger pulse voltage of about 23000V is added to the xenon lamp to ionize the xenon lamp and form a long spark in the lamp. The spark quickly forms a high-density arc discharge on the voltage at both ends of the lamp to produce a strong flash. At this time, the voltage on the energy storage capacitor is discharged through the xenon lamp to maintain the xenon lamp. When the capacitor voltage drops to a certain degree due to discharge, the main circuit is added to keep the xenon lamp working in the arc discharge state.

故障處理：

Troubleshooting:

由于聽到了機內高壓放電板上的“哧哧哧”的高壓拉弧聲，可以判定高壓放電回路和氙燈均無故障。查主供電電源，放電拉弧時電壓在110V左右，這說明貯能電容充放電正常，由于玻璃放電管內有燒焦發黑的現象，取下后解剖發現放電管內部電頭有被氧化銹蝕，導致放電不切底不能激發氙燈工作形成連續拉弧。

As the "Chi Chi" high-voltage arc sound on the high-voltage discharge board inside the machine is heard, it can be determined that the high-voltage discharge circuit and xenon lamp are free of fault. Check the main power supply. The voltage is about 110V when discharging and arcing, which indicates that the charging and discharging of the energy storage capacitor is normal. Due to the phenomenon of burning and blackening in the glass discharge tube, it is found that the electric head inside the discharge tube is oxidized and rusted after being removed. As a result, the xenon lamp cannot be excited to form a continuous arcing without cutting the bottom of the discharge.

更換后開機，燈泡在啪的一聲后點亮。測主電路供電板供電電壓為18V，測3525集成的8腳0~4.8V、9腳,5V、10腳0V、11腳6.2V、14腳5V、16腳5.1V，輸入、輸出電壓均正常，觀察一天無異常，故障排除。

Turn on the machine after replacement, and the bulb will light up after a snap. Measure that the power supply voltage of the main circuit power supply board is 18V. Measure the 8-pin 0~4.8v, 9-pin, 5V, 10 pin 0V, 11 pin 6.2V, 14 pin 5V and 16 pin 5.1V of the 3525 integrated. The input and output voltages are normal. Observe that there is no abnormality for one day. The fault is eliminated.

內窺鏡設備維修人員認為在光導纖維廣泛應用的今天，醫用冷光源在使用性能上發生了質的變化，為了在整體上讓觀察顯示系統達到佳的視覺效果，氙燈光源逐漸替代了其他鹵素燈光源。一般鹵素燈與其相比，氙燈除了更省電外，還對設備的散熱效果也有了大的改變。所以，要勤于“剖析”電路，掌握其電路原理，對以后的維修工作會有不少的幫助。

The maintenance personnel of endoscope equipment believe that with the wide application of optical fiber, the performance of medical cold light source has changed qualitatively. In order to achieve a good visual effect of the observation and display system as a whole, xenon light source has gradually replaced other halogen light sources. Compared with general halogen lamps, xenon lamps not only save more power, but also greatly change the heat dissipation effect of equipment. Therefore, we should be diligent in "analyzing" the circuit and mastering its circuit principle, which will be of great help to the future maintenance work.

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