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故障现象 机器自检正常,但在测量时出现TROVBLE—4。故障分析与检修 打印TROVBLE—4,提示仪器光强度不足。首先检查钨灯灯丝未断,灯丝电压DC12V正常,更换灯泡,故障依旧,怀疑内部有元件损坏。由于仪器没有电路原理图,给维修带来了困难。仔细分析线路结构,根据故障现象,怀疑故障出在光电转换及前置放大部分。用万用表测量前置放大板的三路输出9、7、5脚,在测量状态下,量钨灯点亮期
Symptoms The machine self-test is normal, but TROVBLE-4 appears during the measurement. Fault Analysis and Inspection Print TROVBLE-4, indicating that the light intensity of the instrument is insufficient. First check the tungsten filament is not broken, the filament voltage DC12V normal, replace the bulb, the fault remains the same, suspected internal component damage. Because the instrument does not have a circuit schematic, maintenance is difficult. Careful analysis of the line structure, according to the phenomenon of failure, suspected of failure in the photoelectric conversion and preamplification. Use a multimeter to measure the three-way output of the preamplifier board 9,7,5 feet, in the measurement state, the amount of tungsten lighting period