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该机使用一年有余,一次按下放音键后,乐曲节奏变快而无法正常收听。打开机盖接通电源,用万用表监测马达二端电压,调节调速电位器,电压无任何变化,始终为2.3V(电源为2节镍镉电池,电压2.6V),从而表明电机调速电路(LAG673)损坏。由于一时无法购到该集成块且调换又相当麻烦,故采取局部修理法。从废弃的收放机上拆下一片低压电机调速电路,型号为AN6651,自制一小印刷板,尺寸为8×15mm,焊上
The aircraft more than a year, a press the play button, the music rhythm faster and can not be normally listened to. Open the cover connected to the power supply, with a multimeter to monitor the voltage across the motor, adjust the speed potentiometer, the voltage without any change, and always 2.3V (power supply for the two nickel-cadmium batteries, voltage 2.6V), indicating that the motor speed control circuit (LAG673) is damaged. Due to the temporary can not buy the manifold and the exchange is quite troublesome, so take the local repair method. Remove a low-voltage motor speed control circuit from the discarded machine, model AN6651, made a small printing plate, the size of 8 × 15mm, the welding