Question about Sony MHC-GX8800 CD Shelf System

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Lost speaker output at rear of unit

Hooking speakers back up after a move and later realized that i lost all speaker output at rear of unit... can still use headphones to listen...what happened? did I blow a circuit or fuse that can be repaired?

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  • oyoyoy Jan 05, 2008

    ay, kinda the same problem. i have a philips magnavox FW754P CD mini system, w/ surround, but no amped sub out. i bridged an 8 ohm sub on the left and right terminals, cranked it, fine for like 20 seconds, then it just died... everything works fine, just no output out of any of the speaker terminals. headphones work though. i should have known it would not have an overload safety shut off as did my previous systems. can this be repaired? would it be worth it? what exactly went wrong?


  • Cliffix Mar 01, 2008

    Sounds like your power amp is not working, just like mine. It is protected by a 4 amp 250V fuse located on the lowest most pcb.  (next to another fuse that I think is 1.5 amp). In my case, I dound the power amp fuse had blown; I replaced it and it blew again immediately, and produced a bit of smoke in the process that comes out from the junction of the power amp chip and the heat sink that the amplifier pcb is attached to.  So, I conclude that the power amp on my CMT 707 is blown.    Everything else works on the system, including sound from the headphone jack (which must be directly off the preamp) so I'm tempted to replace the amplfier pcb if I can find the part. (P/N 39-0707-00) rather than junk the system. Any opinions on whether 1) this would work; and 2) where I might find the part?



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Check the continuity of your speaker cables either by using them on another system or with a test meter. Could be that the cables got damaged in the move.

Posted on Jan 04, 2008

  • JohnAC Jan 04, 2008

    The headphone output comes from the same amplifier that feeds the speakers. That's why the speakers are turned off when you plug in headphones.


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Hi Guys

Johnac is right the same amplifier that produces sound on the head phones drives the speaker outputs. If you plug in the headphones you will have no sound form the speakers.

If there was a problem with either a fuse or a sound output device you would have the set not switching on as Sony has buildt a very comprehensive protection system into the GX880.

My suggestion is to also check your spekaer wiring. Or the speakers them selves might be faulty.

Also make sure you have set the soundfield setting to Dolby Pro-logic too enable all the speakers to have sound on playback. Thereby chacking too see if it is not only your front speakers that is faulty.

Best of luck

Posted on Mar 20, 2008


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