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Post subject: Rumble 200 Combo OD broken
Posted: Thu Dec 07, 2017 12:38 pm
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I bought a used Rumble 200 combo at a local pawn shop. It's in great shape, clean, doesn't appear abused. Got it home and all works fine except the OD. When I push the activation button, no red indicator light, no change in output sound, twirling the Drive or Level knobs has no effect. However, I still get normal output to the speaker (OD does not mute the amp.)

I haven't tried any pot cleaner yet, but I will later today.

I've searched the forum and found several threads on OD issues. Not sure which version of R200 I have here, how can I determine that - from serial # or ???

Any comment or suggestions appreciated. I can return it to the store for full refund within 30 days, but I'd like to fix it (or get a partial refund on the purchase price).


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 7:55 am
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You don't have footswitch to try ? yes or no ?

I guess is no.
It could be the press button, if you have a F.S. and if F.S. can switch on Overdrive.
No overdrive ; it could be the relay K1A inside the amp


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 12:08 pm
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stratele52 wrote:
You don't have footswitch to try ? yes or no ?

I guess is no.

Whoa! You don't give a chap much time to answer! No, I don't have a Fender footswitch. But I do have one for a Vox amp that might work.

I did try DeoxIT on the OD press button, FWIW.

stratele52 wrote:
It could be the press button, if you have a F.S. and if F.S. can switch on Overdrive.
No overdrive ; it could be the relay K1A inside the amp

Thanks! I'll traverse your simple flowchart as soon as I find an appropriate footswitch.


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:11 pm
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brians356 wrote:
stratele52 wrote:
You don't have footswitch to try ? yes or no ?

I guess is no.

No, I don't have a Fender footswitch. But I do have one for a Vox amp that might work.



Not shure the Vox foot switch will work with this amp, there are so many contacts wiring in a FS

Witch Vox ?


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:20 pm
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I need to dig out the Vox FS, don't know its designation. But, it does have two buttons, as it can select Vox VT amp models, etc. So probably need to find a simple 1-button FS.

Also, how do I tdetermine the Rumble "Series X" for this amp? I notice the User Manual on Fender.com says "Series A". I have no idea how old this amp is.


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:30 pm
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To simulate Rumble 200 FS , plug a guitar cable in the amp FS input jack.
Take a piece of wire ( or any piece of steel ) and connect ends of the wire to the tip ( end of plug of the guitar cable) to the long side ( sleeve) of this plug.
The end you hold in your hand, there is no electricity , it is safe.

In other word make a short between plus and minus at the guitar cable plug


Imagehttps://flic.kr/p/EaqYc1


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:35 pm
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Thanks, I should have thought of that myself.


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:39 pm
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brians356 wrote:
Thanks, I should have thought of that myself.


I look first a shematic to see how it should work. Some amp may not work with a guitar cable short


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 1:52 pm
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stratele52 wrote:
brians356 wrote:
Thanks, I should have thought of that myself.


I look first a shematic to see how it should work. Some amp may not work with a guitar cable short

I don't have a schematic, only the "block diagram" in the manual. But possibly that suffices for this question.

However, for certain the block diagram does not reveal "relay K1A", how will I find that if required?


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 2:07 pm
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Wait a minute , is you amp is all solid state Or with tubes ?

I'm afraid Google show me the wrong shematic.
If all Solid State, forget what I write since the begining
:oops:


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Fri Dec 08, 2017 2:23 pm
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stratele52 wrote:
Wait a minute , is you amp is all solid state Or with tubes ?

I'm afraid Google show me the wrong shematic.
If all Solid State, forget what I write since the begining
:oops:

I find this in a review on "NoTrebel.com (2014) on re-design of Rumble series:

The Rumble 15, 25, and 40 all have solid-state power while the Rumble 100, 200, 200 Head, 500, and 500 Head have Class-D power. The stronger combos are also upgraded with Eminence drivers.

So, does Class-D have tubes? I can say the audio output comes on almost immediately after power-on.


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Sat Dec 09, 2017 4:01 am
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brians356 wrote:

So, does Class-D have tubes? I can say the audio output comes on almost immediately after power-on.



Did you see sommes tubes if you look at the back of the amps ? I guess not. Back is all close.
This mean it is all solid State amp.

I can't find schematic for this amp. Anyway, you need solid electronic knowledge to work on.


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Sat Dec 09, 2017 2:13 pm
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The footswitch activation did not trigger the OD activation.

Thanks, "stratele52", but I seem to have exhausted your KB on this.

Either this forum has disappointingly scant traffic, or there are no other members out there who know much about this Rumble 200. Is there another forum, offsite, where I should ply my trade? Or are these amps so "disposable" (if not under warranty) that I'm wasting my time seeking information about any problems?


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Sat Dec 09, 2017 2:36 pm
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Just 2 days since you first post, be patient.

I'm sorry but what kind of answer may you have if you can't work in amp's electronic ?
Send a Private message to TimAudio. He is a pro on amp repair

He gave some answer there, you'll found his address ;

https://forums.fender.com/viewtopic.php?f=13&t=108652


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Post subject: Re: Rumble 200 Combo OD broken
Posted: Sat Dec 09, 2017 3:11 pm
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stratele52 wrote:
Just 2 days since you first post, be patient.

I'm sorry but what kind of answer may you have if you can't work in amp's electronic ?
Send a Private message to TimAudio. He is a pro on amp repair

He gave some answer there, you'll found his address ;

https://forums.fender.com/viewtopic.php?f=13&t=108652

Thank you for that link.

With all due respect, where did say I "can't work in amp's electronics"? You called out "relay K1A" so I naturally assumed you had a schematic, and that it was feasable to tackle this amp. Since then you've been backpeddling. I think you've made what points you can, let someone else provide the uncomfortable facts henceforth, yes?


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