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Finding why my JBL CS300.1 amp.keeps.blowing fuses

Posted by Josh M Giaimis on

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Brad Brown

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The process involved in troubleshooting and repairing that amp requires specialized tools and meters. You would need to check all the capacitors to see if they are okay by using ESR and capacitance meters, To check the semiconductors you need to unsolder at least one leg and check them unless they are integrated multistaged devices. IF they are you need to check their current draw.

Posted on Jan 01, 2021

Testimonial: "great info so i connected low amp 12 volt power not blowing fuse but all 3 lights are blinking blue on top"

  • Brad Brown Jan 06, 2021

    Those lights are flashing because the power supply cannot provide enough voltage to the unit. There is something in that AMP that is pulling so much current the voltage on your power supply is dropping before the fuse blows. I would wager that you have a bad MOSFET

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