Troubleshooting - Boss Audio Systems MR400UAB User Manual

Bluetooth fully marinized mp3-compatible digital media am/fm receiver
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TROUBLESHOOTING

If you suspect something is wrong, immediately switch power off. Do not use the unit in
abnormal condition, for example without sound, or with smoke or foul smell, can cause fire or
electric shock.
Immediately stop using it and call the store where you purchased it. Never try to repair the
unit by yourself because it is dangerous to do so.
General
1) Car's engine switch is not on.
Turn you car's key to ACC or ON.
2) Cable is not correctly connected.
Check the connection.
3) Fuse is burnt.
Replace fuse.
4) Volume is in mute or minimum.
Check volume or mute on/off, adjust volume to a desired level.
5) Sound skips.
The installation angle is more than 30°. Adjust the installation angle less than 30°.
6) The operation keys do not work.
The built-in micro- computer is not operating properly due to noise. Press the RESET button
to restore the program to zero.
Radio
1) Much noise in broadcasts.
Station or signal is too weak. Select other stations of stronger signal level.
2) The antenna cable is not connected.
Insert the antenna cable firmly into the antenna socket of this car radio.
3) Preset station is reset.
Battery cable is not correctly connected. Connect the battery cable to the terminal that is
always live.
USB
USB is connecting but no sound
a) USB connection is not good. Take it out and insert again.
b) USB is damaged or no music file inside. Change to another USB, or record music inside it.
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