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台湾产20英寸彩电(SUNTX)K9121型电源电路中采用的厚膜块STR40090,一旦损坏市场上很难买得到,为给长年搞维修工作的人员及业余爱好者提供方便,绘制了电源电路的部分电路图和利用分立元件代替厚膜块STR40090改装的电源电路图一同供给大宗,以便维修时参考。原电路如图1所示,改装后的电路如图2所示(见57页),利用分立元件代替损坏的电源厚膜块STR40090的具体方法是: 1.将其原电路损坏的厚膜块STR40090摘掉; 2.将开关变压器与开关管形成的振荡回路的接
Thick film block STR40090 used in Taiwan’s 20-inch color TV (SUNTX) K9121-type power circuit is difficult to buy in the event of damage to the market. For the convenience of personnel and amateurs engaged in maintenance work for many years, the power circuit is drawn Part of the circuit diagram and the use of discrete components instead of thick film block STR40090 modified power supply circuit diagram together for bulk supply, for maintenance reference. The original circuit shown in Figure 1, the modified circuit shown in Figure 2 (see page 57), the use of discrete components to replace the damaged power thick film STR40090 specific method is: 1. The original circuit damage to the thick film block STR40090 removed; 2. The switching transformer and the switching tube formed by the oscillation circuit of the connection