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两机TDA8356提供电压相同而行脉冲幅度相差5倍的原因

Appliance Repairing(2012)

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Abstract
一台北京牌2122Q型彩电,场块采用TDA8356,其两组供电均由行输出变压器提供.其中,行输出变压器⑤脚为TDA8356⑥脚提供的46V电压.用示波器测量行输出变压器⑤脚波形,如图1所示,幅度为70Vp-p. TCL 2136D彩电的场块也采用TDA8356,其两种供电也是由行输出变压器提供.其中,行输出变压器⑤脚为TDA8356⑥脚提供约46V电压,用示波器测量行输出变压器⑤脚波形如图2所示,幅度为400Vp-p.
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