一台YY5—4型包裹收寄机,在收寄同一重量,同一单价的包裹时,有时正常,有时少5计5分。按照一般的习惯,我们首先检查计数电路“5分入”(17/B 17)点以前的译码电路、再译码电路、计算盘电路,它们的元件与接触情况均良好。测量分A“点,有负脉冲输入,说明上述各部分电路工作正常。进一步检查二进制计数器本身。发现在外电较高的时候(高于220V), 5分B继电器一 A YY5-4 type parcel receiving and sending machine, when receiving parcels of the same weight and the same unit price, is sometimes normal, sometimes less 5 and 5 points. As a general rule of thumb, we first check the decoding circuit before the counting circuit ”5 points into“ (17 / B 17), then decode the circuit, calculate the circuit of the disk, and their components and contacts are good. Measuring points A ”point, there is a negative pulse input, indicating that the above part of the circuit is working properly further check the binary counter itself found in the higher external power (higher than 220V), 5 B relays