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Thread: Fender Acoustasonic won't power on. Help me open it up to look in?

  1. #1
    Junior Member
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    Dec 2011
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    Fender Acoustasonic won't power on. Help me open it up to look in?

    Hey,
    Out of the blue my acoustasonic jr. won't power on.(yes, it's plugged in). I'm trying to get a look inside but can't do so because some wires running out of the bottom of the board won't give. I can't see how to open the thing up any more than I have. Any insights as to how I can free the wires so I can take a look?
    Thanks

  2. #2
    Senior Member Enzo's Avatar
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    May 2006
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    Lansing, Michigan, USA
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    Welcome to my world.

    Lay the amp back and remove the speakers. You might be able to remove just one and get it. PLEASE use masking tape labels, draw a chart, do SOMETHING so you'll know which wire goes where. Don;t assume you will remember. Page 9 of the service manual does show colors, but use labels. Free the wires from the speakers and reverb pan, and fish them up through the hole as you extract the chassis.

    The mains wiring is simple - mains cord, fuse, power switch, transformer primary. Got 120VAC at the black wires for the power tranny? No? The find out why. If so... Power off, and pull the black wires off the board. Measure resistance between them. Open or got continuity? Open means the thermal fuse INSIDE the transformer has opened. Or much more rare the winding itself has opened.

    COnsidering your symptom, you might only need a couple inches of access space to determine cause. SO se if that can happen before tearing into the speaker vault.
    Education is what you're left with after you have forgotten what you have learned.

  3. #3
    Junior Member
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    Dec 2011
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    One speaker got me there

    Hi Enzo,
    I'll have to get a volt meter to check further. I was hoping the fuse went, but it looks fine. I'm a bit over my head with the rest but I'll give it a go tomorrow.
    Thank you for responding.
    ~Jason

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