例1,故障现象:曝光表测光正常,机械快门B、X两挡正常,使用电子快门时,速度明显偏慢。 分析:机械快门B、X两挡正常,问题应在电器部分。由其电路原理图知,最大的可能是电池电压过低、电池触片不良、引线焊点虚焊及直流升压电路故障,也可能是快门盘基板下的电位器积碳或碳膜严重磨损所至。不排除快门速度调整电路有其他故障的可能。 Example 1, Symptom: Exposure meter metering normal, mechanical shutter B, X two block normal, the use of electronic shutter, the speed was significantly slower. Analysis: mechanical shutter B, X two block normal, the problem should be in the electrical part. It is known from its circuit diagram, the biggest possibility is the battery voltage is too low, poor battery contacts, lead solder joints Weld and DC boost circuit failure may also be under the shutter disk substrate potentiometer carbon or carbon film serious wear and tear To all. Do not rule out the shutter speed adjustment circuit has the possibility of other failures.