我们发现这主要是由于缺少正确的 codecs（压缩数据流扩大器）。

We found that this was primarily due to the lack of the correct codecs (compressed data stream expanders).

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只有A/C扩大器上的电压是来自输入端的正确电压时，初级输出（即A/C压缩机继电器）才会被激活开启。

It is only when the correct voltages are applied to the A/C amplifier from the key inputs that the primary output (the A/C compressor relay) will be energised.

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一旦线路断开，扩大器探测到线路上的压强变化，就会停止电磁离合继电器运行，关闭压缩机。

Once the circuit is broken the amplifier detects the voltage change in this circuit and de-energises the magnetic clutch relay, turning the compressor off.

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