What is the problem of The card reader is used normally for a period of time, and it is found that it does not read the card or emits abnormal sound and light prompts ?

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Q: The card reader has been used normally for a period of time, but it is found that it does not read the card or emits abnormal sound and light prompts. Possible reason?
answer:
(1) The controller is faulty. Some faults of the controller may cause the card reader corresponding to the controller to be abnormal, such as clock failure, and whether the controller is faulty, you can check the software's detection information or view it.
Check whether the ERR fault indicator of the controller motherboard is flashing (normally, the ERR indicator is off). If the software detects that the controller has a clock failure, first calibrate the time of the controller, if it is normal after calibration, it means that the controller has no fault, otherwise the controller needs to be repaired;
(2) The card reader is disturbed by the scene. The phenomenon is that the card reader is only connected to the power supply and tested separately, and the card reader is normal. For this situation, it is necessary to first understand the on-site environment, such as: whether the AC220V AC power supply of the controller chassis is connected to a three-core wire, and whether there is a real grounding;
Whether the load of the power supply is too large: whether the distance between the card readers is too close, such as back-to-back installation, the horizontal distance is less than 30 cm; the card reader is directly installed on the metal surface, without hollowing out the metal surface or padding under the card reader Card reader; whether there are high-power devices around the card reader, etc.;
(3) The card reader is damaged. The phenomenon is that the card reader is only connected to the power supply and tested separately. If the card reader is still abnormal, the card reader needs to be repaired.