Computer needle cars sometimes have occasional incorrect disconnection alarms. Sometimes there are four or five times a day, sometimes two days, but there is no regularity.
Analysis of the reasons for the untimely error disconnection alarm of the computer needle car:
Computer needle cars sometimes have occasional incorrect disconnection alarms. Sometimes there are four or five times a day, sometimes two days, but there is no regularity. The repairman tried to replace the decoder board with a 12 volt, 5 volt power switch, but none of them worked. Careful inspection revealed that this machine used the old generation Dahao 91 improved electronic control system, and its break line detection was separated from the jump electromagnet drive. The repairman carefully checked that there was no short circuit between the nine needle signal lines, and there was no phenomenon of rubbing the case. After hearing the operator said that the machine has been using the needle all the time, recently because of the change of the order of more colors, there is a frequent false alarm. Therefore, the maintenance personnel measured the positive and negative resistance of the needle and other needle signals, and found that one of them had an abnormal resistance. In theory, it should be non-energized because there are diodes isolated and connected in parallel. Open all the head detection, and finally found that a signal line on the No. 8 head is off, just on the common foot, so when the machine is working, sometimes there is no contact, sometimes contact, and an irregular false alarm occurs.
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