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Possible blown fuse in Rumble 40

#21
Tim Skaggs said:
It’s not impossible the keyboard caused the problem, especially if the keyboard
involved has its own preamp for plugging direct into a power amp. That could have been a signal too hot for the preamp in the Rumble. It will still need diagnosed by a tech with the test gear required and knowledge of how to use it.
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No, the input is suitably protected.
 
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#22
Kenny056 said:
Well this is disappointing

My oldest child is 6 and he has an engineering mind. He and I might just make this a project, since it's probably not worth the money to have someone service it. I just checked it out again and when you power it on the power light flashes on for a split second and it lets out that little pop that it did when it was working. It then goes dead.

I should add that this amp is very nearly new. I played it once at church and that's it. Between rehearsal and service, it probably has less than 90 minutes playing time on it.

It worked perfectly when the keyboard got plugged into it. That's why I assumed it was keyboard related. You all certainly no much more than I do about this sort of stuff.

Any suggestions for where to start as far as diagnosing the issue?
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My suggestion is to start by getting an education in electronics.
 
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#23
Kenny056 said:
My oldest child is 6 and he has an engineering mind. He and I might just make this a project, since it's probably not worth the money to have someone service it.
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I’d advise strongly against it.
On the back of the amp, you will find the following warning:

CAUTION: To reduce the risk of electric shock, do not remove the back cover. No user serviceable parts inside. Refer servicing to qualified service personnel.

They’re right.
 
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#25
My experience with this amp was similar. Got it in trade at a pawnshop, sounded pretty good for about a month then went mute. Not even a pop or frying noise though. Nothing to be done. No way I'd risk a shock trying parts swapping; diagnosis alone would require specialist equipment. I bought an Orange Crush 50 watt. Problem solved.
 
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#26
Kenny056 said:
Well this is disappointing

My oldest child is 6 and he has an engineering mind. He and I might just make this a project, since it's probably not worth the money to have someone service it. I just checked it out again and when you power it on the power light flashes on for a split second and it lets out that little pop that it did when it was working. It then goes dead.

I should add that this amp is very nearly new. I played it once at church and that's it. Between rehearsal and service, it probably has less than 90 minutes playing time on it.

It worked perfectly when the keyboard got plugged into it. That's why I assumed it was keyboard related. You all certainly no much more than I do about this sort of stuff.

Any suggestions for where to start as far as diagnosing the issue?
Click to expand...
First, if it's still under warranty, let Fender deal with it.

What you described does sound like a more serious issue than a blown fuse. Even if it was a fuse, the Rumble 40 doesn't have an easily assessable way to get to a fuse, so it wasn't meant to blow, if that makes sense.

If the Rumble uses capacitors, they might be the cause. But either way, you're dealing with a power issue and would suggest you have someone with more knowledge/experience look at it.
 
#27
Kenny056 said:
I let a friend borrow my Rumble 40 for use with his keyboard. I've played keyboards through all sorts of bass amps without issue, so i wasnt at all concerned. Well in this case he played for about 10 seconds and then it went pop. Now when I try to power it on, the power light briefly comes on and then fades out.

Any ideas how to remedy this? Thanks!
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Does it have a fuse? If so have you checked it?
 
#29
Echo716 said:
First, if it's still under warranty, let Fender deal with it.

If the Rumble uses capacitors, they might be the cause. But either way, you're dealing with a power issue and would suggest you have someone with more knowledge/experience look at it.
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Why do people always think it's capacitors? That's so far down the list that it approaches wild ass guess.

This amp uses a small flyback SMPS which will shut down exactly like this upon failure.

Thegreatzambini said:
Does it have a fuse? If so have you checked it?
Click to expand...

If the fuse is inside, it's not intended to be replaced. It's there to protect against catastrophic failure, fire and shock.
 
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#30
Kenny056 said:
Well this is disappointing

My oldest child is 6 and he has an engineering mind. He and I might just make this a project, since it's probably not worth the money to have someone service it. I just checked it out again and when you power it on the power light flashes on for a split second and it lets out that little pop that it did when it was working. It then goes dead.

I should add that this amp is very nearly new. I played it once at church and that's it. Between rehearsal and service, it probably has less than 90 minutes playing time on it.

It worked perfectly when the keyboard got plugged into it. That's why I assumed it was keyboard related. You all certainly no much more than I do about this sort of stuff.

Any suggestions for where to start as far as diagnosing the issue?
Click to expand...
Is it under warranty new?
 
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#32
Spidey2112 said:
Their lack of inductive reasoning?

"Resistance is futile, human."

Mork, from Ork
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I worked on one of the last shows Robin produced (as an A1/TD), he was testing out new material for an upcoming project that of course never materialized. This was both sad and tragic IMO.
 
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#37
It's probably just a coincidence that it happened when he plugged the keys in. I'm not qualified, but I have read that they aren't really serviceable and are essentially junk if they break. Hope that's not the case, good luck!
 
#39
Ken R said:
Fender is very good at warranty service. I would call their customer service line and give them the serial number. You might be surprised to find out it is still under warranty.
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this is THE top reason to buy Fender amps, and buy them new. They have a decent history of no-questions asked replacements on electronics.
 

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