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例1 故障现象:无论是重放或记录时,时常出现无规律地自动停机现象。分析与检修:卸开机盖,通电重放试机,录像机工作一切正常。但约五、六分钟左右(或时间更长一些)自动停机,断电后等一会重新开机,又能恢复正常工作,但故障会在无时间规律的情况下重新出现。根据故障现象分析,电路中可能有受温度变化损坏及接触不良的元件。仔细检查电路板上有关元件的焊点,均未发现有受热虚焊的情况。先检查电源电路,将输出
Example 1 Failure phenomenon: Whether it is replaying or recording, often automatically and regularly shut down phenomenon. Analysis and Maintenance: Uninstall the lid, power replay test machine, VCR work everything is normal. But about five or six minutes (or longer) automatically shut down, after a power failure such as a reboot, but also to resume normal work, but the failure will be in the absence of time and again the case of law. According to the fault phenomenon analysis, the circuit may be subject to temperature changes damaged and poor contact of the components. Carefully check the solder joints on the circuit board components, were not found to be Weld situation. First check the power circuit, the output