【摘 要】
：
(2)由于V502的控制极有两路检测电路,采取逐个解除保护的方法检修:“X射线”过高检测电路断开稳压二极管VD552,行输出过流检测电路断开稳压二极管VD554,并进行开机试验和检测
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(2)由于V502的控制极有两路检测电路,采取逐个解除保护的方法检修:“X射线”过高检测电路断开稳压二极管VD552,行输出过流检测电路断开稳压二极管VD554,并进行开机试验和检测V502的控制极电压,当断开行输出过流检测电路的稳压管VD554后,开机V502的控制极电压始终为0 V,由此判断行输出过流保护电路引起的保护。对该电路元件进行检测,发现取样电阻R560阻值由正常时时0.33Ω变大为0.6Ω,且阻值不
(2) Since V502 control circuit has two detection circuits, to take one by one to lift the protection method of inspection: “X-ray ” high detection circuit disconnect the Zener diode VD552, line output overcurrent detection circuit disconnect the Zener diode VD554, and power-on test and test V502 of the control voltage, when the line output over-current detection circuit after the regulator VD554, V502 boot control voltage is always 0 V, thus determine the line output over-current protection circuit Caused by protection. The circuit components were detected and found that the resistance of the sampling resistor R560 from normal 0.33Ω to 0.6Ω, and the resistance is not
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