| 摘要 |
In a public telephone set there are provided a coin processing unit (CCC) for sorting coins inserted into the telephone set, a coin box (15) for collecting inserted coins, a control unit for collecting the sorted coins in the coin box and sending an origination from the telephone set a plurality of coin detectors (DA, CR, CC, CK) for detecting clogging by coins of coin passageways to the coin box (15), a control circuit (MCC) for detecting a fault in accordance with the outputs of the coin detectors, a memory device which stores a program for causing the control circuit (MCC) to detect a fault, and a switch interlocked with a hook switch (H) for starting the operation of the control circuit (MCC) and the memory device. There are also provided display devices (DIS) connected to the control devices for displaying a faulty part. According to this invention presence or absence of a fault is automatically detected by hooking off operation and the location of the fault is displayed. Accordingly the user is informed of the fact that telephone set can not be used and its use is automatically prevented and a maintainance man can note the faulty part. |
