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[例1]功能显示屏不亮,其他功能均正常。分析检修:根据故障现象判断,该故障可能产生在定时操作电路或电源电路。本着先易后难的原则,首先检查定时操作电路的供电电源,测主板P_(6002)⑥(也是定时操作电路插头P_(7002)⑧),正常时为-30V,现为OV,因此,基本确定故障在电源部分。卸下电源盒,测-30V整流输出(D_(111)正端),电压亦为OV,测量D_(111)正反电阻,果然开路。用一只普通整流二极管1N1004代换,故障排除。 [例2]重放时机器发出明显的机械噪音,图像上有不规则的杂波,伴音断断续续。分析检修:由故障现象可知磁带运行速度不正常,当按下暂停键时,图像呈静止画面,机械噪音消失,由
[Example 1] The function display is off and all other functions are normal. Analysis and maintenance: According to determine the fault phenomenon, the fault may occur in the timing circuit or power circuit operation. According to the principle of easy first and last, first check the power supply of the timing operation circuit, measure the motherboard P_ (6002) ⑥ (also the timing operation circuit plug P_ (7002) ⑧), normally -30V and now OV, Basically determine the fault in the power section. Remove the power box, measured -30V rectified output (D_ (111) positive), the voltage is OV, measuring D_ (111) positive and negative resistance, really open. Replaced with an ordinary rectifier diode 1N1004, troubleshooting. [Example 2] The machine emits significant mechanical noises during playback, irregular clutter appears on the picture, and the sound is intermittent. Analysis and maintenance: The fault phenomenon shows that the tape running speed is not normal, when the pause button is pressed, the picture was still picture, the mechanical noise disappears from