Sony radio says protect - Sony Mhcec909ip Mhc-ec909ip Mini Hi-fi System Boomboxe

When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio.
The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your vehicle manufacturer's service centre and get them to enter this code for you.

Your stereo went into protect mode to prevent complete failure of the amplifier inside that radio. Most of the time this happens from playing the stereo real loud for a real long time and it overheats. Most of the time disconnecting the receiver/stereo and letting it cool all the way down or at least 5 minutes and then reconnecting it to the power source will reset the protection mode. You want to make sure you are keeping the radio cool. Don't stack anything on top of it and try keeping a small fan blowing on it to expedite the heat out from the unit. Also turning it down every now and then to let everything cool down a bit will help prevent it from going into protection mode as well.

"protect" usually means speaker wires are crossed or speaker ohm load is too low. if you have more than one speaker connected. if you did not change anything since the last time you used the radio the internal amp might have fried and you should have the radio serviced if the cost is worth it.

what code? as far as i know, i have never seen a sony radio that is code protected.

as far as i know, very few sony radios are code protected.

Usually the "front end" of the radio has a bad FET transistor. This is caused by a static zap at the antenna. Early models suffered from this and the cure is to replace the FET and add protection diodes. If you need help with this email me at.... [email protected]

Rod

bare wires??? big no no!!!!! you need to check your factory radio fuse i am sure you blew it.

The audio amplifier IC´s are on short circuit.

Hi, Off hand, I believe there is nothing wrong with the setup, maybe just not 100% compatible. It's just that the Sony Amp's protection is doing its job (just too good) and the stock radio is likewise doing it's job (but not too good). Just maybe, at poweron, the stock radio sends out a small burst output (maybe capacitor discharge) that we normally hear as a slight thump in the speakers which was when no Sony amp, ok. However, when you have added the amp, you also amplified the thump, which unfortunately the Sony protection reacts to. You can off course let it be since you have figured out a way to make it work or you can try and install a delay on for the power amp or separate it's power on from the stock stereo. The idea is to turn on the stereo with the Sony off and after a second or less, a manual switch or a delay activated switch will turn on the Sony. The idea is to switch on the Sony after the thump has finished. Good luck and hopes this gives you an idea. Pls post back how things turn up. Kind regards.

Hi again, Looks like you posted twice, in any case pls have a look at your other post @ http://www.fixya.com/support/t182326-amp_protection