Re: the peaice that goes into the headphone jack isnt...
I researched the logitech website and found the solution.
you must turn both parts on, but instead of letting go after 3 seconds,
you keep holding until the lights start flashing red and blue on both
pieces. Once BOTH pieces flash ONLY BLUE they have re-paired
themselves, and they should work fine now.
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Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.
Red is for the left speaker, blue for the right and the copper one is the ground. Replacement 3.5mm jacks should be available at all hobby shops. Solder it yourself; the left wire goes to the central connection.
I have the same model as you. Plug in the transmitting unit into a good working power outlet. Make sure you have the audio connected to a loud source. Turn on the source device producing the loud audio to be transmitted to your headphones. Now see if the transmitting unit's LED light is on. Check headphones for audio. (May have to tune in the headphones and adjust its volume as well). I recommend that the source of your audio have its built-in speakers off, while still providing audio out to your transmitting unit, via an external audio output. Check your source manual or look for audio jacks on the front or back. There may be a setting to turn this on and for the main built-in speakers to be turned off as well.
If this does not work, unplug the transmitting unit, and then plug it back in again, after waiting for about 10 seconds - all while audio is being provided to the unit. It should come on.
Remember that if the audio to the transmitting unit is quiet OR off for about one minute, the transmitting unit will turn off and you will hear FM noise, loudly, on your headphones. This is due to the "lack of audio" timer built-in to the transmitting unit.
if there isn't screws to take the MP3 player apart then their are clips on the inside
Unscrew the screws (or if you have clips from the on/off switch use a screw driver to open it. this isn't the most safest way to open it i could break so this is a last opption.) ussing a sodering iron resoder the conection between the loose headphone jack and the curcit board.
(you can pick up a sodering iron at Radio shack for as low as 10$)
i researched the logitech website and found the solution. you must turn both parts on, but instead of letting go after 3 seconds, you keep holding until the lights start flashing red and blue on both pieces. Once BOTH pieces flash ONLY BLUE they have re-paired themselves, and they should work fine now. http://logitech-en-amr.custhelp.com/cgi-bin/logitech_en_amr.cfg/php/enduser/fattach_get.php?p_sid=kPXUPeRi&p_li=&p_accessibility=0&p_redirect=&p_tbl=9&p_id=2883&p_created=1125080596&p_olh=0
Does this help? http://www.fixya.com/support/t882518-right_speaker_stops_working
It's probably the socket - it may be that it's coming away from the board or the switch inside that cuts the speakers when you use headphones is faulty. It may be a simple resolder or you could replace the part.