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CM6550型机为上海无线电三厂生产的调频调幅双卡分层分箱式立体声收录音机。该机有快速复制、连续放音、电脑选曲、五段式音调控制、轻触式机芯,可分别使用普通磁带与二氧化铬磁带。现将该机的常见故障及维修方法介绍如下:一、电源部分CM6550收录机电源部分由电源变压器 B301、桥堆 EG314、EG315、电子滤波稳压集成电路 W7812等元件组成。电源变压器次级分为:交流输出7.5V0.3A 与22V 1.7A。经桥堆整流及电解电容滤波后分别输出直流10V 与28V 供给功放、发光指示、话筒
CM6550-type machine for the Shanghai Radio Factory production of FM AM dual-card sub-box layered stereo tape recorders. The machine has a fast copy, continuous playback, computer selections, five-stage tone control, touch-type movement, respectively, using normal tape and chromium oxide tape. Now the machine’s common failures and maintenance methods are described below: First, the power part of the CM6550 tape recorder power supply by the power transformer B301, bridge reactor EG314, EG315, electronic filter regulator integrated circuit W7812 and other components. Power transformer secondary divided into: AC output 7.5V0.3A and 22V 1.7A. After the bridge rectifier and electrolytic capacitor filter, respectively, output DC 10V and 28V power amplifier, light instructions, microphone