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例1 一台飞跃3508-4型黑白机,出现无图无声故障,经查是MC13007损坏所致,经查各脚电压发现其脚电压升高,此故障一般是该块内部负反馈电阻损环造成的。处理方法如下:在集成块MC13007的脚对地接一只10kΩ电阻即可恢复。例2 一台飞跃3508-4黑白机出现无图像的故障,查各脚电压发现MC13007的脚电压上升至5～7V,此现象说明MC13007内电路中的AGC控制电路
Example 1 A leap 3508-4 type black and white machine, there is no picture silent fault, the investigation is caused by the MC13007 damage, the voltage of the foot is found by examining the voltage rise of his foot, the fault is generally the block negative feedback resistance ring Caused. Proceed as follows: Manifold MC13007 foot to ground connected to a 10kΩ resistor can be restored. Example 2 A leap 3508-4 black and white machine there is no image of the fault, check the voltage of each pin found MC13007 foot voltage rose to 5 ~ 7V, this phenomenon shows MC13007 circuit in the AGC control circuit