This fault shutdown V890 mute Circuit-related. This circuit implements power off mute while simultaneously achieving power off light extinction. V890 working voltage of 36 feet and leapfrog to the mute Circuit chips. 36 foot EHT detection signal input pin. If this PIN voltage of more than 3. 5V will cause the protection circuit to start. Cause incentives to stop working. Check the V890, V890, VD898 were normal. Disconnect the C89l end, in 200M gear measuring C891 found leakage. Normally about 8 MΩ of resistance. After replacing the normal.


When they encounter not boot properly. Sometimes you need to check +B voltage filter capacitance C490 (250V/10 μ f).