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例1 装入磁带后,二三秒钟便自行出带。故障分析:接通电源,插入磁带能入盒,磁带只加载到一半,便自行退带。说明入(出)盒电机工作正常,状态检测工作位置也是正确的,为了便于分析故障,查找中央处理器的内部工作情况得知MN67434VRSB的(59)脚为入盒指令、(58)脚为出盒指令。PD92放像机的入盒加载工作过程是这样的:插入磁带IC_(6001)的(59)输出高电平,经D_(6503)送给IC_(6501)(加载电机驱动电路)的⑤脚,从IC_(6501)(BA6219B)的②脚输出电机工作电压,
Example 1 After loading the tape, two or three seconds out of their own band. Failure Analysis: Power, insert the tape into the box, the tape is only loaded in half, they self withdrawal. It indicates that the motor of the input / output box is working properly and the position of the status detection is correct. In order to facilitate the analysis of the fault and find the internal operation of the CPU, the (59) pin of the MN67434VRSB is the input command of the cassette, Box instructions. PD92 player into the box loading process is as follows: insert the tape IC_ (6001) (59) output high, the D_ (6503) to IC_ (6501) (load motor drive circuit) (6501) (BA6219B) ② feet output motor operating voltage,