(4)因为伴音低放电路设计为 OCL 电路,确定伴音低放电路是否引起无伴音故障时,大家可以测量伴音低放电路中点电压,看看此电压是否等于伴音低放电路电源供电电压的一半。如果伴音低放电路中点电压不对,说明伴音低放电路存在故障。由于伴音低放电路设计在伴音低放块内部,所以必须更换伴音低放块。如果伴音低放电路中点电压正确,为了判断低放块内部伴音前置电路是否出现故障,大家可以在伴音低放 (4) Since the low-noise sound path is designed as an OCL circuit, to determine whether the low-noise sound path causes no sound failure, you can measure the mid-point voltage of the low sound path and see if this voltage is equal to the low- half. If the sound low discharge circuit midpoint voltage is wrong, indicating that the sound low discharge circuit is faulty. As the sound low-drop circuit design in the low-sound internal, so you must replace the sound low-drop. If the sound of low-voltage mid-point circuit voltage is correct, in order to determine whether the low-lying internal sound front circuit failure, we can sound low