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(7)查振荡回路元件,如:C515(0.015μF/100V)失效。(8)若开机瞬间有+130V电压约3s(秒钟)后,+130V消失,系过流保护电路动作所致,应查过流电路元件。B4(+24V或26.5V)端有过流元件。这时B4保险电阻R550(4.7Ω)阻值变大或损坏开路。B5(+15V)输出端有短路元件,如:IC551(N7812)击穿短
(7) Check the oscillation circuit components, such as: C515 (0.015μF / 100V) failure. (8) If there is + 130V power for about 3s (seconds) at power-on moment, + 130V disappears, which is caused by the overcurrent protection circuit action. Check the overcurrent circuit components. B4 (+24 V or 26.5 V) over the flow of components. At this moment B4 insurance resistance R550 (4.7Ω) the resistance value bigger or damages the open circuit. B5 (+15 V) output short-circuit components, such as: IC551 (N7812) breakdown short