问:JBJ-A型包裹收寄机,在加装附加器改接电路以后(即角0~(12)与角3~(26)之间串接一组角4的常闭触点),有时计数不准。现象是:按资费调整键至4角,再按键应是5角,但是却变为9角;调到9角再按键,应是0角.但却变为4角,进位正常。这是什么原因?应如何排除?(吉林市邮电局于庆福)答:上述计数不准与电路改接有关。由于 Q: JBJ-A type parcel receiving and sending machine, after installing the adapter to connect the circuit (that is, angle 0 ~ (12) and angle 3 ~ (26) in series with a set of angle 4 normally closed contacts) Sometimes count is not allowed. The phenomenon is: press the tariff adjustment key to 4, and then press the button should be 5, but it becomes 9; transferred to 9 and then press the button, it should be 0. However, it has become the 4-angle, carry normal. What is the reason? How should be excluded? (Jilin City Post Office Yuqing Fu) A: The above counting is not allowed to switch and the circuit. due to