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(2)场输出失常保护电路场输出失常保护电路由ZD300和Q713组成,对场输出电路IC1401(LA7845)的⑧脚电压进行检测。场输出电路与3只场偏转线圈采用直接耦合电路,要求中点直流电压为OV,±8V供电电压对称稳定。为了防止供电和负载异常,使中点电压偏离正常值,损坏场偏转线圈和场输出电路,设计了该保护电路。场输出电路正常时,IC1401的输出端有60VP-P的场脉冲,该脉冲将稳压二极管ZD300击穿,迫使Q713导通,小信号处理电路IC702的輥輴訛脚为低电平,IC702正常
(2) Field Output Fault Protection Circuit The field output fault protection circuit is composed of ZD300 and Q713 and detects the ⑧-pin voltage of the field output circuit IC1401 (LA7845). Field output circuit and the three field deflection coil using a direct coupling circuit, requiring midpoint DC voltage OV, ± 8V supply voltage symmetrical stability. In order to prevent the power supply and load anomalies, so that the midpoint voltage deviates from the normal value, damage the field deflection coil and the field output circuit, designed the protection circuit. Field output circuit is normal, the output of IC1401 60VP-P field pulse, the pulse voltage regulator diode ZD300 breakdown, forcing Q713 conduction, small signal processing circuit IC702 roll error correction pin is low, IC702 normal