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[例1]故障现象:不开机,指示灯不亮。分析与检修:指示灯不亮,说明5V待机电路异常。首先通电测试,发现5V电压没有。首先测试待机电路ICl的⑤、⑥、⑦、⑧脚,没有电压(正常的机器应该有320V左右的电压),说明启动电路异常。于是检查启动电路上的电阻,发现RBl损坏。更换后,故障排除。[例2]故障现象:12V、24V无输出。分析与检修:开机测试,发现5V待机电压输出正
[Example 1] Symptom: does not turn on, the indicator does not light. Analysis and Maintenance: Indicator light is not on, indicating 5V standby circuit is abnormal. First power-on test and found that 5V voltage is not. First test the standby circuit ICl ⑤, ⑥, ⑦, ⑧ feet, there is no voltage (normal machine should have a voltage of about 320V), indicating abnormal startup circuit. So check the resistance of the start-up circuit and found RBl damage. After replacement, troubleshooting. [Example 2] Symptoms: 12V, 24V no output. Analysis and maintenance: boot test, found that 5V standby voltage output positive