Question about JBL PSW1000 Speaker

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Jbl psw1000 no power

Led wont light, sub wont work. Replaced internal fuse...whats the next most likely component to test/replace ?

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Have you checked all fuses. There might be 2 - one for the input and one specifically for the amp section...

Check to see if the speaker is fried. Remove the grill then place your fingers as evenly as you can aa couple of inches away from the cone. Press gently and listen. There should be no scrating sounds at all. If you hear this, first try repositioning your fingers. If it persists your speaker is fried. This is caused by a few reasons. Amp failed and took speaker with it. Or a large signal was inputted which causes the amp to hold its max power for a longer period of time (amplified signal is no longer a sine wave but a sqare wave).

Otherwise, unless you know what you are doing with AC (house power) I don't suggest you go poking around-you need at least a volt meter to start testing

Posted on Dec 22, 2007

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The issue is most likely a short in the amp internal circutry where power is essentially flowing without resistance acrosss the short. You may or may not have sound or crackling noise as it depends on where the short is.

If you are electronically inclined, I suggest the folliowing:

- disconnect all power and open the amp up
- look for any burn marks around the circut board and parts.
- first focus in on the area where the power comes in - see if any diodes (black cylinders with stripes on them) are burnt / cracked
- next have a look at all the MOSFETS. These should be 3-legged components and will likely be mounted to the shell or heatsink. Look for any burn marks or cracks on these.
- also look for any wire or component that may be shorting other components. Generally all wires should have shielding and all components should be soldered firmly. Anything crossing other components could be a problem.

If you find any burnt/cracked components, they will need to be replaced.

Here is a sample image showing the MOSFET chips to the top and bottom on the aluminum rail.
http://memimage.cardomain.com/ride_images/3/2514/3981/31284490262_large.jpg

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