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目前有些地区对修理123- 1型收片机控制与分频电路的故障感到有些困难,主要是对它的线路原理还不够理解,现将线路原理和可能出现的故障分析如下。 本机有 2400Hz、 2496Hz、 2376Hz三种同步对相频率源,通过控制与分频电路使电机有三种运转速度,所以在电源电压正常的情况下,通过电机的运转变化,就能判断出电路中故障的大致部位。 同步电路有三个音叉振荡器,一个是振荡频率为2400Hz电磁式音叉振荡器,作同步频率源,另二个是压电式音叉振荡器,振荡频率分别为2496Hz和2376Hz,是对相
At present, some areas have some difficulties in repairing the failure of the control and frequency dividing circuit of the 123-1 type film collector. The principle of the circuit is not understood enough. The principle of the circuit and possible faults are analyzed as follows. This machine has 2400Hz, 2496Hz, 2376Hz three synchronous phase frequency source, through the control and frequency divider circuit so that the motor has three operating speeds, so the power supply voltage is normal, through the motor operation changes, you can determine the circuit The approximate location of the fault. Synchronous circuit has three tuning fork oscillator, one is the oscillation frequency of 2400Hz electromagnetic tuning fork oscillator for synchronous frequency source, the other two are piezoelectric tuning fork oscillator, the oscillation frequency of 2496Hz and 2376Hz, respectively, is the phase