Sony DSX-M55BT Operating Instructions Manual page 28

The display disappears from/does not appear in
the display window.
 The dimmer is set to [DIM-ON] (page 22).
 The display disappears if you press and hold OFF.
 Press OFF on the unit until the display appears.
 The connectors are dirty (page 24).
The display/illumination flashes.
 The power supply is not sufficient.
 Check that the boat battery supplies enough
power to the unit. (The power requirement is
12 V DC.)
The operation buttons do not function.
 The connection is not correct.
 Check the connection of the unit.
If the situation does not improve, press DSPL
and (back)/MODE for more than 2 seconds
to reset the unit.
The contents stored in memory are erased.
For your safety, do not reset the unit while you
are driving.
Radio reception
Stations cannot be received.
The sound is hampered by noises.
 The connection is not correct.
 If your boat has built-in radio antenna (aerial)
in the rear/side glass, connect an REM OUT
lead (blue/white striped) or accessory power
supply lead (red) to the power supply lead of a
boat's antenna (aerial) booster.
 Check the connection of the boat antenna
(aerial).
 If the auto antenna (aerial) will not extend,
check the connection of the power antenna
(aerial) control lead.
 The tuning step setting has been erased.
 Set the tuning step again (page 9).
Preset tuning is not possible.
 The broadcast signal is too weak.
28
GB
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.
USB device playback
You cannot play items via a USB hub.
 This unit cannot recognize USB devices via a USB
hub.
A USB device takes longer to play.
 The USB device contains files with a complicated
tree structure.
The sound is intermittent.
 The sound may be intermittent at a high-bit-rate.
 DRM (Digital Rights Management) files may not
be playable in some cases.
Audio file cannot be played.
 USB device formatted with file systems other
than FAT16 or FAT32 are unsupported.*
* This unit supports FAT16 and FAT32, but some USB
device may not support all of these FAT. For details,
refer to the operating instruction of each USB device
or contact the manufacturer.
NFC function
One touch connection (NFC) is not possible.
 If the smartphone does not respond to the
touching.
 Check that the NFC function of the smartphone
is turned on.
 Move the N-Mark part of the smartphone
closer to the N-Mark part on this unit.
 If the smartphone is in a case, remove it.
 NFC receiving sensitivity depends on the device.
If One touch connection with the smartphone
fails several times, make BLUETOOTH connection
manually.