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开机测+B电压只有29V(正常为140V),其他几路电压也大幅度下降。但副电源的+5V和-30V很正常,并且按遥控器待机键,CPU(M50436-560SP)⑨脚有明显的高、低电平变化,这说明故障与遥控电路无关。断开行变T501⑩脚,并接100W灯泡,测+B电压仍为29V,这说明问题在主电源。但查遍主电源的振荡、启动、反馈、稳压等所有电
Power-on test + B voltage is only 29V (normal to 140V), the other several channels voltage also dropped significantly. However, the secondary power supply + 5V and -30V is normal, and press the remote control standby button, CPU (M50436-560SP) ⑨ feet significantly high, low changes, indicating that the fault has nothing to do with the remote control circuit. Disconnect the line change T501⑩ foot, and then 100W bulb, measuring + B voltage is still 29V, indicating the problem in the main power. But check the main power of the oscillation, start, feedback, regulator and all other electricity