system to normal, but there is no sound output. Measurement JB19 of each feet voltage, MUTE2 for mute script should is negative pressure, measuring have are 18 v voltage, description is mute has, according to circuit diagram find learned that, MUTE2 of control from Yu voltage detection circuit, specific work process following: VF sampling points is from standby transformer output of rectifier line Shang take a Exchange voltage, by D328 rectifier and R349 limited flow Hou, get about 7 v of DC voltage, gave Q314,Q313,Q312 common composition of check circuit, From the collector output of Q312-12 volt.
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