Sony CDX-GT420U - Manuel (Page 18)

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No sound.
• The volume is too low.
• The ATT function is activated.
• The position of the fader control “FAD” is not set for
a 2-speaker system.
No beep sound.
• The beep sound is canceled (page 11).
• An optional power amplifier is connected and you are
not using the built-in amplifier.
The contents of the memory have been erased.
• The RESET button has been pressed.
t Store again into the memory.
• The power supply lead or battery has been
disconnected.
• The power supply lead is not connected properly.
Stored stations and correct time are erased.
The fuse has blown.
Makes noise when the position of the ignition
is switched.
The leads are not matched correctly with the car’s
accessory power connector.
During playback or reception, demonstration
mode starts.
If no operation is performed for 5 minutes with
“DEMO-ON” set, demonstration mode starts.
t Set “DEMO-OFF” (page 11).
The display disappears from/does not appear
in the display window.
• The dimmer is set “DIM-ON” (page 11).
• The display disappears if you press and hold (OFF).
t Press and hold (OFF) on the unit until the
display appears.
• The connectors are dirty (page 16).
The Auto Off function does not operate.
The unit is turned on. The Auto Off function activates
after turning off the unit.
t Turn off the unit.
Card remote commander operation is not
possible.
Make sure the insulation film has been removed
(page 4).
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 playback.
• Defective or dirty disc.
• The CD-Rs/CD-RWs are not for audio use (page 14).
MP3/WMA/AAC files cannot be played back.
The disc is incompatible with the MP3/WMA/AAC
format and version (page 14).
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.
• “A.SCRL” is set to “OFF”.
t Set “A.SCRL-ON” (page 11).
t Press and hold (DSPL) (SCRL).
The sound skips.
• Installation is not correct.
t Install the unit at an angle of less than 45° in a
sturdy part of the car.
• Defective or dirty disc.
The operation buttons do not function.
The disc will not eject.
Press the RESET button (page 4).
Radio reception
The stations cannot be received.
The sound is hampered by noises.
• Connect a power antenna (aerial) control lead (blue)
or accessory power supply lead (red) to the power
supply lead of a car’s antenna (aerial) booster (only
when your car has built-in FM/AM antenna (aerial)
in the rear/side glass).
• Check the connection of the car antenna (aerial).
• The auto antenna (aerial) will not go up.
t Check the connection of the power antenna
(aerial) control lead.
• Check the frequency.
Preset tuning is not possible.
• Store the correct frequency in the memory.
• The broadcast signal is too weak.
Automatic tuning is not possible.
• Setting of the local seek mode is not correct.
t Tuning stops too frequently:
Set “LOCAL-ON” (page 12).
t Tuning does not stop at a station:
Set “MONO-ON” (page 12).
• The broadcast signal is too weak.
t Perform manual tuning.
During FM reception, the “ST” indication
flashes.
• Tune in the frequency accurately.
• The broadcast signal is too weak.
t Set “MONO-ON” (page 12).
An FM program broadcast in stereo is heard in
monaural.
The unit is in monaural reception mode.
t Set “MONO-OFF” (page 12).
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.
t Reconnect it.
The USB device takes longer to play back.
The USB device contains files with a complicated tree
structure.