One touch connection (NFC) is not possible

Keep the smartphone close to the system until the smartphone is connected with the system. If you fail, move the smartphone slightly on the N marked part of the system.
Check that the NFC function of the smartphone is set to on.
If the smartphone is in a case, remove it.
NFC receiving sensitivity depends on the device. If you fail to connect the system with a smartphone by one touch several times, connect it to the system by on-screen operation.
If the POWER switch is set to the NFC OFF side, set it to the center.