20TroubleshootingIf you suspect something is wrong, immediately switch power off. Immediately stop using it andcall the store where you purchased it. Never try to repair the unit yourself because it is dangerousto do so.Problem Possible cause SolutionGeneralThe unit will not switchon.Car ignition is not on.Cable is not properlyconnected.Fuse is burnt.Turn your car key in the ignition.Check cable connection.Replace fuse with a new fuse of thesame capacity.No sound Volume is set at minimum orthe mute function is on.Check the volume or switch the mutefunction off.The unit or screen doesnot function normally. The unit system is unstable. Press the RESET button.TUNER modeU n a b l e t o r e c e i v estations.The antenna is not connectedproperly. Connect the antenna properly.Poor quality reception ofradio station.T h e a n t e n n a i s n o t f u l l yextended or it is broken.Fully extend the antenna and ifbroken, replace it with a new one.Preset stations are lost. T h e b a t t e r y c a b l e i s n o tproperly connected.Connect the permanent live on theunit to the permanent live on thevehicle.USB/SD/MMC modeUnable to insert USBdevice or SD/MMC card.The memory card or USBdevice has been inserted thewrong way round.Insert it the other way around.The USB device or SD/MMC card cannot beread.NTFS format is not supported.Check that the USB/SD/MMC filesystem is in FAT or FAT32 format.Due to different formats, some modelsof USB storage devices or MP3players may not be read.Remote controlThe remote control isnot working or does notwork properlyT h e b a t t e r i e s a r e l o w o rempty. Change the batteries.