Does it shuts down with engine running? Most marine stereos have low voltage protection. If battery goes low then stereo shuts down to protect your batteries. Try to run engine or battery charger and test your stereo. If still shuts down that would indicate overheating protection kicks in. There is many possibilities for that. From shorted speaker wire, incorrect speaker wiring to internal problem with the unit.
Could be thermo electronic component normally mounted on the inside of the unit...its to protect against over heating
SOURCE: Sony CDX-FW700
The manuals for this product can be found at http://manualshark.org/p/sony-4/sony-cdx-fw700-1131/
SOURCE: CD won't work
Have you tried using the reset button on the front of the unit (under the face panel)
SOURCE: Cannot play my portable audio device with Sony cdx c500x
The multichanger has to be connected,with a cd in, but then the head unit will play whatever is fed to the bus in sockets. This effectively means the multichanger is playing to itself. If you want both to work, use a pair of piggy back rca leads into the head unit, one to the cd, one to the mp3. Then break into the cd leads and feed one of the pairs, one +ve, one -ve to a double pole switch so that you cut the sound from the cd allowing the mp3 in. To play cd's, flick the switch.
SOURCE: my sony cdx 4000r is not picking up radio signals
sony cdx4000r not working correctly plays cd s inconsistently radio not playing ariel in place
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