Question about JBL PB10 Subwoofer

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JBL Subwoofer - Intermittent operation

Hi,

I have a powered JBL subwoofer as part of a HT speaker system SCS200.6, hooked up to an H/K AVR135 6.1 HT receiver.

The system worked fine for 2 years, and suddenly the sub is giving me trouble.

When it's turned on, it makes a short, garbled hiss, and would produce either no sound, or sound at a very low volume. It would produce sound after about 2 minutes, and then would not work for another 2 minutes, and this cycle continues.

Throughout, the signal indicator would remain 'green' indicating that the sub is receiving LFE signal input from the receiver.

My guess is a bad cap/caps.

Any precise way to locate the issue would be highly appreciated.

Thanks in advance.

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Sometimes bad caps show a lifting or rounding of the top of the cap, sometimes this top will split from heat and pressure and sometimes it will not show any sign of damage but will be dry inside and its capacitance value will drop to a very low value. Replace the big power supply caps and test again. Get the same size, value and voltage rating. You can go higher on voltage rating and a bit on value. Getting a similar size or something that will fit in the same space is important also.

Posted on Mar 24, 2010

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Posted on Jan 02, 2017

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