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八、检修实例和维修资料维修用资料:表1为卡拉OK电路集成块在路阻值和电压值实则数据;表2为稳压电路和音调、音量调节电路用集成块、晶体管实测数据;表3为功放电路用晶体管实测数据;表4为荧光屏音量显示电路用晶体管实测数据;表5为功放电路用美国型号晶体管参数与代换管型号。例1 磁带输入信号正常而话筒输入无反映。分析与检修:磁带信号是通过音调、音量电路和功放电路放大,能放大磁带信号,说明这两部分电路能正
Eight maintenance examples and maintenance information Maintenance information: Table 1 karaoke OK circuit block in the road resistance and voltage values in real data; Table 2 for the regulator circuit and tone, volume control circuit with integrated block, the transistor measured data; Table 3 for the power amplifier circuit with the measured data; Table 4 for the fluorescent screen display circuit with the transistor measured data; Table 5 for the power amplifier circuit with the United States model transistor parameters and substitution tube models. Example 1 The tape input signal is normal and the microphone input is not reflected. Analysis and Maintenance: tape signal is amplified through the tone, volume circuit and power amplifier circuit, can amplify the tape signal, indicating that these two parts of the circuit can be positive