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After a longtime in storage i connected my adcom gfa power amp to a adcom gtp-350 tuner/ pre-amp to a klipch ksw sub woofer and a pair of small energy speakers. i realized the left channel was alot weaker than the right channel while listinig to an fm station on line. i wiggled the speaker wires on the back of the sub woofer to see if there wasa loose connection. i heared a pot sound and what seemed like a spark and then nothing. i've looked at the fuses on all three components and they look fine. when i turn everything on all i hear is a faint bass note sound at a fairamount of gain level. what should i do now?

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  • raymondpaint Jun 20, 2009

    i have a pair of book shelf speakers, but would't that be the same as disconnecting my left and right channel speakers from the sub woofoer and connecting them directly to the power amp?

  • raymondpaint Jun 20, 2009

    if i elliniate the subwoofer and the system works, what could happen after allowing it to run more than a minute?

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One of the common trouble of electronics unit longtime is not use is a cold solder in power amplifier section.A cold solder joint is where a lead of a component is not soldered at a high enough temperature and results in a bad electrical connection which can respond to physical shock and thermal stress. A solder joint may also be broken or cracked because the receiver was dropped or hit.When you open the receiver look on the front and back of the board along the defective circuit to see any components that look like they are not soldered effectively or the solder connection is cracked or broken. A cold solder joint looks dull and/or bulging unlike the smooth and shiny normal solder joints.Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing..If you're not experienced with troubleshooting and repairing electronics, I strongly suggest look for professional service.

Good luck..

Regards:
VOTIT

Posted on Jun 20, 2009

  • LORETO LACARON
    LORETO LACARON Jun 29, 2009

    Even you elliminate the subwoofer and allowing to run for a longer time or an hour there is nothings happen. Its much better you reworks the solder parts joints so it will works better performance.



    Regards:

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Hi there,

Well, it seems like that there must be some short circuit on the pre-amp., now u can try pluging a external speaker with a adapter, if this external speaker works that means there must be some loose wire(connection). check this.

Good Luck!!
Thanks

Posted on Jun 20, 2009

  • Mukesh Kumar Jun 20, 2009

    Yes, you can try connecting tham but do not try this for more than 1 minute.

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