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1.茶花YH23型盒式收录机,收音正常,放音出现啸叫,其啸叫声大小受音量电位器的控制。故障原因是前置放大管BG2基极与集电极之间并接的消振电容C8开路所致,只需用一只100pF瓷片电容更换即可。若功放电路中的C2(1μF)、C22(1000μF/10V)失效或R30(36kΩ)断路,也可能引起自激而产生啸叫,但此时产生的啸叫不受音量电位器控制。 2.银星F1012型放音机,刚开机时放音正常,几
Camellia YH23 cassette recorder, normal radio, playback howling, the howling sound volume potentiometer control. The reason for the malfunction is that the preamplifier BG2 is connected to the collector of the base and collector of the capacitor C8 open circuit due to the capacitor, only a 100pF ceramic capacitor can be replaced. If C2 (1μF), C22 (1000μF / 10V) fails or R30 (36kΩ) open circuit in the amplifier circuit, it may cause self-excitation and generate howling, but the whistling generated at this time is not controlled by the volume potentiometer. 2. Silver Star F1012-type player, just start playing normal, a few