Sony MEX-BT31PW - Manual (Page 40)

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The disc does not play back.
 Defective or dirty disc.
 The CD-Rs/CD-RWs are not for audio use
(page 35).
MP3/WMA/AAC files cannot be played back.
 The disc is incompatible with the MP3/WMA/
AAC format and version. For details on
playable discs and formats, visit the support
site.
MP3/WMA/AAC files take longer to play back
than others.
 The following discs take a longer time to start
playback.
– A disc recorded with a complicated tree
structure.
– A disc recorded in Multi Session.
– A disc to which data can be added.
The display items do not scroll.
 For discs with very many characters, those may
not scroll.
 “AUTO SCR” is set to “OFF.”
– Set “A.SCRL-ON” (page 33).
– Press and hold
 (SCRL).
The sound skips.
 Installation is not correct.
– Install the unit at an angle of less than 45° in
a sturdy part of the car.
 Defective or dirty disc.
USB playback
You cannot play back items via a USB hub.
 This unit cannot recognize USB devices via a
USB hub.
Cannot play back items.
 A USB device does not work.
– Connect it again.
A USB device takes longer to play back.
 The USB device contains files with a
complicated tree structure.
The sound is intermittent.
 The sound may be intermittent at a high-bit-
rate of more than 320 kbps.
Pandora® connection is not possible.
 Shut down Pandora® application on the mobile
device, and then launch again.
Bluetooth function
The connecting device cannot detect this
unit.
 Before the pairing is made, set this unit to
pairing standby mode.
 While connected to a Bluetooth device, this
unit cannot be detected from another device.
– Disconnect the current connection and
search for this unit from another device.
 When the device pairing is made, set the
Bluetooth signal output to on (page 20, 21, 22).
Connection is not possible.
 The connection is controlled from one side
(this unit or Bluetooth device), but not both.
– Connect to this unit from a Bluetooth device
or vice versa.
 Check the pairing and connection procedures
in the manual of the other device, etc., and
perform the operation again.
The name of the detected device does not
appear.
 Depending on the status of the other device, it
may not be possible to obtain the name.
No ringtone.
 Adjust the volume by rotating the control dial
while receiving a call.
 Depending on the connecting device, the
ringtone may not be sent properly.
– Set “RINGTONE” to “1” (page 20).
 The front speakers are not connected to the
unit.
– Connect the front speakers to the unit. The
ringtone is output only from the front
speakers.
The talker’s voice volume is low.
 Adjust the volume level.
The talker’s voice cannot be heard.
 The front speakers are not connected to the
unit.
– Connect the front speakers to the unit. The
talker’s voice is output only from the front
speakers.