长虹型分体式冷暖空调，不工作 检修方法57w

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长虹分体式冷暖空调，不工作
故障现象：通电后，室内、外机都不能启动，且指示灯均不亮，蜂鸣器也无声。
) D# J+ K( z$ }1 s% O  D分析与检修：测主板变压器初、次级阻值均正常，测稳压电路７８１２电压输出电压为 ＋１２Ｖ，７８０５电压输出为＋５Ｖ，说明电源部分正常。检查室外压缩机、启动电容以及室内 步进电机均正常，怀疑故障可能在微电脑ＩＣ１（ＣＰＵ７５８０８ＢＣＵ）部分及外围元件，测ＩＣ１ 21 脚为＋５Ｖ、③脚为５Ｖ（高电平）正常，进一步查得４.１９ＭＨｚ 晶振损坏。
维修措施：更换４.１９ＭＨｚ 晶振，试机，故障排除。
1 \( c+ w6 R8 [* Z/ k6 t) |资料来源；北京长虹空调维修电话中心。

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