During the use of the dot matrix printer, it is often encountered that the power indicator is on after the printer is turned on, the word car does not move, and the button on the operation panel fails. This type of fault is mostly caused by the failure of the main control circuit of the dot matrix printer, the motor drive circuit of the carriage motor and the drive circuit of the paper feed motor. So how do you tell which part of the circuit is faulty? Here is a simple, fast and practical way to judge faults.
1. First install the paper manually by the printer, then turn it on, about 3 seconds, artificially simulate the homing action of the word car, that is, according to the specific type of the dot matrix printer, insert the start position of the car by using the paper strip. In the groove of the detector or by pressing the left button switch of the moving car, the printer is considered to have returned the word car. Then press the “Online†button several times to see if the online lamp is normally on or off. If it can be normally turned off, the main control circuit works normally. Otherwise, the main control circuit is faulty and should be repaired first.
2. When the main control circuit is working normally, it can be further judged whether the paper feed motor drive circuit works normally. The method is: press the "online" button to make the printer offline, and then press the "line feed" button or the "page change" button to see if the paper motor can drive the paper feed mechanism to operate normally. The paper motor drive circuit works normally, otherwise it is a fault in the paper motor drive circuit and should be repaired.
3. After the above inspection and maintenance of the two parts of the printer main control circuit and the paper feed motor drive circuit, if the printer failure has not been eliminated, then it can be concluded that the fault occurs in the motor drive circuit part of the carriage, according to the actual circuit Repair it.
In addition, it should be mentioned that some printers may have a power indicator light on the printer after the printer is turned on, the word car does not move, and the operation panel keys fail. This is not a hardware failure of the printer. As long as the DIP function switch of the printer is correctly set, the normal operation can be resumed. Therefore, when encountering similar faults, be sure to check carefully whether the settings of the DIP function switch of the printer are correct, so as to avoid half the effort.
Source: Internet
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