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Post subject: Champion 30 DSP has headphone sound but not speaker
Posted: Sun Nov 20, 2016 5:36 pm
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Got h
this amp from a friend who said it worked "off and on". I cleaned up the circuitboard and have sound in headphones but not speaker. Any ideas what I can check or way to fix?


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 3:38 am
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On most amps, when you plug headphone,contacts in the headphone jack disconnect the speaker.

You remove headphone, contacts connect speaker. Look ant this jack.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 7:49 am
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Thanks Stratele52...I shot some contact cleaner in the headphone jack and am getting an intermittent PB thru speaker. Seems to be OK for a second then cut out again. I'm going to reflow the HP contacts and see what happens.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 12:41 pm
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Found a suspect solder joint right after the headphone jack. Reflowed solder there and a few other spots and all works fine now. Still get an annoying hum untilI put my hand on the guitar strings, then it goes away. Any ideas on that one?


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 3:25 pm
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richmondscribe wrote:
Still get an annoying hum untilI put my hand on the guitar strings, then it goes away. Any ideas on that one?


A better-quality instrument cable may help.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 3:30 pm
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richmondscribe wrote:
Thanks Stratele52...I shot some contact cleaner in the headphone jack and am getting an intermittent PB thru speaker. Seems to be OK for a second then cut out again. I'm going to reflow the HP contacts and see what happens.



Spraying contact cleaner can't work for that kind of contact.

If solders are good and printed circuit are not broken ( you must have some experience to see ) and with what you write, you need to replace the jack.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Nov 22, 2016 5:48 pm
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Will do...Thanks!


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue Mar 06, 2018 10:33 am
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Well, back to square 1. Still getting sound thru HP but only occasionally thru speaker. When speaker is working the signal begins to crackle, fade in and out and eventually dies. I'm figuring a component must be working until it heats up and then it goes in to death spiral. Don't understand why the HP works 100% of the time tho'. I'm not a tech so it's all guesswork to me.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue May 22, 2018 6:07 am
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The culprit was the input jack. Reflowed the joints and all works perfectly now. I always seem to make things harder than they actually are! Thanks to all for the replies.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Tue May 22, 2018 2:55 pm
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richmondscribe wrote:
The culprit was the input jack. Reflowed the joints and all works perfectly now. I always seem to make things harder than they actually are! Thanks to all for the replies.


Input jack are for guitar. That is what you mean ?

You wrote ;

" have sound in headphones but not speaker. Any ideas what I can check or way to fix? "

This cannot bey the guitar input jack :shock:


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Wed May 23, 2018 6:28 am
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stratele52 wrote:
richmondscribe wrote:
The culprit was the input jack. Reflowed the joints and all works perfectly now. I always seem to make things harder than they actually are! Thanks to all for the replies.


Input jack are for guitar. That is what you mean ?

You wrote ;

" have sound in headphones but not speaker. Any ideas what I can check or way to fix? "

This cannot bey the guitar input jack :shock:


It could have been two separate, independent problems.

The initial, consistent, obvious problem was the headphone jack that permanently cut off the speaker output.

But since the input jack problem was intermittent, he didn't notice that it was also causing problems when using headphones.

And then after fixing the headphone jack so the speaker worked, when the speaker began to occasionally cut off he just assumed that it was the same old problem and didn't plug in headphones to check if the headphone out was working.

(Or plugging in headphones wiggled the board enough to make the input jack start working again.)
-------------------------
As you said, the input jack couldn't cause the speaker to cut off with the headphone jack working.

But when an amp has multiple problems, especially when one of the problems is intermittent, keeping track of the symptoms can get confusing.

And it's easy to jump to conclusions, like thinking that when the speaker starts cutting out again the headphone jack is probably working like it appeared to be initially.


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Wed May 23, 2018 7:10 am
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I may have used the wrong terminology concerning the jack. I reflowed the connections in the amp that are marked Inputs 1 and 2. After reflowing everything worked as it should, both speaker and headphones. I guess the guilty jack had come a bit loose from use (ha! a rhyme!) and was simply not getting the signal from guitar into the amp circuit. Just as long as she's working I'm happy...


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Post subject: Re: Champion 30 DSP has headphone sound but not speaker
Posted: Wed May 23, 2018 5:23 pm
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richmondscribe wrote:
I may have used the wrong terminology concerning the jack. I reflowed the connections in the amp that are marked Inputs 1 and 2. After reflowing everything worked as it should, both speaker and headphones. I guess the guilty jack had come a bit loose from use (ha! a rhyme!) and was simply not getting the signal from guitar into the amp circuit. Just as long as she's working I'm happy...


It wasn't your terminology.

If the input jack had been the main initial fault, you couldn't have gotten sound from either the headphone jack or the speaker.

After you fixed the headphone jack connections and then the speaker started cutting out again (due to the input jack problem), the headphone jack should have been cutting out at the same time as the speaker.

If you tried the headphone jack on the second go-round and got sound, it had to be that plugging into the jack wiggled the board enough to make the input jack work again.

Regardless, whatever the causes/fixes, congratulations on getting the amp working again. At this point that's all that really matters.


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