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例1 故障现象:接通电源,各操作键均不起作用。分析与检修:检查主电路板(VEPO1225A)的电源部分,测量P_(1101)插座第⑧脚输出电压为5.6V。测量Q_(1102)(2SD275)三极管的工作电压:集电极电压为11V(正常值为20.6V)、基极电压为6.5V(正常值为12.9V).均比正常值低。此时触摸C_(1102)(3300μF/35V)温度异常。焊下C_(1102)测量,已严重漏电。更新后,故障排除。例2 故障现象:接通电源,各操作键失灵,但指示灯微亮。
Example 1 Symptom: Turn on the power, the operation keys are not working. Analysis and Overhaul: Check the main circuit board (VEPO1225A) power supply section, measuring P_ (1101) outlet ⑧ pin output voltage of 5.6V. Measure the working voltage of Q_ (1102) (2SD275) transistor: the collector voltage is 11V (normal value is 20.6V) and the base voltage is 6.5V (normal value is 12.9V), both lower than the normal value. At this time touch C_ (1102) (3300μF / 35V) temperature anomalies. Welding C_ (1102) measurement, has serious leakage. After updating, troubleshooting. Example 2 Symptom: Power, the operation key failure, but the indicator light.