Sony SRS-ZR7 Help Manual page 10

The power indicator flashes in red
Sound
No sound/Sound from only one speaker/Low sound level
Distorted sound/humming or noise from the speaker
Network connection
The speaker cannot connect to the network (Other equipment on the network cannot find or recognize the speaker)
Unable to connect to a network via a Wi-Fi connection
Unable to connect to a network via a Wi-Fi connection (even though a correct SSID is selected)
The speaker cannot connect to a network using the UPDATE/WPS button
The speaker does not appear in the device list of the PC's music playback application
The speaker does not appear in the device select screen of SongPal
The speaker cannot connect to music services
The controller cannot find the speaker (The controller cannot browse the contents of the speaker)
Music started automatically (home network)
The sound is interrupted
Playback does not start
BLUETOOTH
Smartphone, iPhone, etc. cannot be paired
Unable to connect the speaker to a BLUETOOTH device with One-touch (NFC)
There is no sound (BLUETOOTH)
Distorted sound/humming or noise from the speaker
USB device
An unsupported USB device is connected
There is no sound (USB)
There is noise, skipping, or distorted sound
A USB device is not recognized
Playback does not start
Playback does not start from the first track
Software update