Sony MEX-BT4050U Manual De Instrucciones página 38

– If the auto antenna (aerial) will not go up,
check the connection of the power antenna
(aerial) control lead.
 The tuning step setting has been erased.
– Set the tuning step again (page 5).
Preset tuning is not possible.
 Store the correct frequency in the memory.
 The broadcast signal is too weak.
Automatic tuning is not possible.
 The broadcast signal is too weak.
– Perform manual tuning.
RDS
PTY displays "- - - - - - - -."
 The current station is not an RDS station.
 RDS data has not been received.
 The station does not specify the program type.
CD playback
The disc cannot be loaded.
 Another disc is already loaded.
 The disc has been forcibly inserted upside
down or in the wrong way.
The disc does not play back.
 Defective or dirty disc.
 The CD-Rs/CD-RWs are not for audio use
(page 33).
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."
38
– Set "A.SCRL-ON" (page 31).
– 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.
– Reconnect it.
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.
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 21, 22, 32).
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.