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一台金凤HB2—2电视机,稳压电源由KC582C与3AD30C组成。查得故障为e—c脚击穿的电源调整管3AD30C拟用3DD03A代换。具体方法是:将KC581C①脚330Ω电阻短路,调整管基极至①脚的连线改接在⑧脚,⑧脚至地的270Ω电阻取掉,⑧脚至+12V的1μF电容接在原270Ω电阻的位置,将原发射极和集电极的接线对调。接上电源其+12V即稳压为10V左右,调整⑤脚的可变电阻,
A Jinfeng HB2-2 TV, power supply by the KC582C and 3AD30C composition. Check the fault e-c pin breakdown power regulation tube 3AD30C intended to replace with 3DD03A. The specific method is: KC581C ① foot 330Ω resistor short-circuit, adjust the base of the tube to the ① pin connected to the connection in the ⑧ feet, ⑧ foot to ground 270Ω resistor removed, ⑧ pin to + 12V 1μF capacitor connected to the original 270Ω resistor Position, the original emitter and collector wiring swap. Connected to the power of its 12V that the regulator is about 10V, adjust the ⑤ pin variable resistance,