Sony PCM-D10 Help Manual page 217

Help Guide
Linear PCM Recorder
PCM-D10
You cannot establish a Bluetooth connection.
Your linear PCM recorder is turned off. Turn on the linear PCM recorder and the other device, and then make sure that the
Bluetooth function is turned on.
The battery of your linear PCM recorder is running low or almost out of power. Replace the batteries with new ones.
The device registration (pairing) information is cleared in the following cases. You need to register (pair) the device with your
linear PCM recorder once again.
The settings on either or both devices are reset to the default settings, for example, due to initialization.
The device registration (pairing) information is deleted, for example, during the course of a repair service.
If the device registration (pairing) is deleted from the linear PCM recorder but the smartphone still has the device registration
(pairing) information of the linear PCM recorder, delete the information and make device registration (pairing) once again.
Your linear PCM recorder and the other device are too apart from each other. Bring them closer. When the linear PCM
recorder and the other device are separated by a long distance, an attempt to establish a Bluetooth connection may fail or
the established Bluetooth connection may be disconnected. Use them in a close vicinity.
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