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Repair subwoofer Yamaha YST-SW320

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krneki10

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I have several years old subwoofer Yamaha YST-SW320 which started to slowly die this week. At first, it was playing sound just like it should with some noise here and there. This noise has became more and more often and there were also several silent breaks. As of moment we are speaking, it will play sound only for a few seconds per minute.

Is there any way that I could fix it? Perhaps replacing capacitors could work? Please notice that I have limited knowledge in electronics.

Thanks for help.
 

It is far more likely to be either a joint worked loose (they do get a lot of vibration!) or the speaker itself. Capacitors are very reliable and if they do go fauilty it's usually a sudden death.

Open it up and check all the connections, including push tags fitted to the loudspeaker itself, you can probably play sound through it (not too loud while the cabinet is open) and wiggle the connections to see if one is intermtittent. If the loudspeaker unit is faulty you can sometimes repair them. The usual failure is the thin wire from the connecting tage to the cone breaks at one end or the other, it can often be resoldered with care.

Brian.
 

There are electronics technicians who would replace capacitors as a first step in fixing an old unit.

Especially electrolytic type. They are known to develop various ailments as years go by. They might get staticky, or leaky, or develop internal resistance (ESR).
 

True, but in a subwoofer the capacitor would be part of an LPF and would have to go intermittent short circuit to chop the sound. An intermittent series inductor is a possibility but again, the connections are the vulnerable part rather than the coil itself.

Brian.
 

do re solder main components
they may have been disconnected though not visible
if it is as you say it is, the problem is from a faulty joint or a cold-solder
 

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