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Post subject: Fender Rumble Bass 25 keeps turning on and off on a loop
Posted: Fri Jan 11, 2019 11:26 am
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Bought a Fender Rumble Bass 25 about 3 or 4 years ago, but I stopped using it probably 2 years ago. Stuffed it in the closet cause I was busy and just remembered about it recently. So the problem is that when I turn on the amp, the amp turns on and off in a continuous loop and doesn't stop unless I unplug the power cable. Do you guys have any idea on how to fix this?


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Post subject: Re: Fender Rumble Bass 25 keeps turning on and off on a loop
Posted: Wed May 08, 2019 1:25 am
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Joined: Fri May 11, 2018 6:09 am
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Location: Budapest-HU
Hello !
I would replace the cable first in your place for the first time!

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Post subject: Re: Fender Rumble Bass 25 keeps turning on and off on a loop
Posted: Tue Jun 18, 2019 6:43 pm
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Thanks I'll probably buy a new cable if I get no other information about this problem. I finally got around to filming what's happening so maybe it would help clarify something.

So here's a video showing what's happening. Hopefully it may help figure out what's going on.

https://streamable.com/0cp53


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Post subject: Re: Fender Rumble Bass 25 keeps turning on and off on a loop
Posted: Wed Jun 19, 2019 8:45 am
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Sure sounds & acts like a thermal shutdown issue where a circuit is immediately heating up due to a short and causing the shutdown. You'll need a schematic and test equipment if you don't already have them. Due to the nature of printed circuit boards and integrated circuitry in modern solid state amps in most instances you have to replace the entire board. Had you sent this in to an Authorized Fender Service Center before the warranty ran out, Fender would have simply sent you a brand new Rumble 25. Good luck on your efforts.

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