①The device time may not be accurate,  need to do the current time automatic time correction card to correct the device time；

②The user may not set the time in the card,  it is necessary to change the start of the time in the card to the default value 2017/1/1,  expiration time is ten years after the current time；

③The card may have expired, need to read the information in the card, continue to delay to change the user card；

④If the time zone of the device is incorrect,  the device needs to brush the cleaning card and the automatic time correction card of the current time；

⑤If the preceding conditions are not rectified, the device may be faulty.