TSSUB 15 gone silent...

Hi I have a full Alto rig FOH comprising 2 15 inch powered subs, 2 15 inch powered tops, an Alto 16 channer mixer. Been using it for couple of years now no issues. Last gig, one of the Subs went quiet. All lights on, pass through to the Top speaker worked fine, just nothing out the sub. It's like the driver has gone of the driver power amp but the rest of the signal path stuff is still OK. How do I repair ? Can I have the circuit diagram ?
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  • Hello Barry,

    Sorry to hear about your troubles. I'd like to help and get you the help that you need. Which Alto speakers are you referring to? It may sound like your speakers may need to get serviced. Warranty and non-warranty claims are not handled here on the forum but I can point you in the right direction to help you out! Here are a couple of options that you could choose from:

    • Submit a Warranty Claim or Service Inquiry with our Technical Support team by logging onto www.altoprofessional.com/support. Select Warranty Claim or Service Inquiry from the drop down menu.

    or

    • For quicker support, call your nearest Support Office.
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  • I’m frustrated.
    OK so I've called "Tech Support" and was told that there are 3 major spare parts, PreAmp, PowerAmp Driver, I can order. (I'm still waiting for the email with the details) or I can call a guy out. Before I do that in the interests of time I've gone in to check out what I can without circuit diags ( which apparently are confidential). so... I've buzzed out the driver, it's fine. I found a fuse on the Power Amp PCB, but it's fine too. I cant see another fuse so it's got to be something deeper. If I'm to work out if it's the PreAmp or the Power Amp I'll need to inject a signal direct into the PowerAmp , but I dunno which are the internal inputs. I can see a few wires connecting to the terminal block from the PreAmp, I can guess, try stuff out but it would be helpful if someone could tell me. PS I can appreciate ALTO wanting to protect their IP but at least a service level block diag with signal definitions should be available in the public domain
    • Hello Barry,

      I can see your concern but service manuals and schematics are not available to the public. Only authorized Alto Professional Audio repair facilities and service centers would be able to obtain this type of information. I personally don't have any information about this neither. If you need information on where to service your product or get parts for it, reaching out to our technical support team is the way to go.
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  • I’m frustrated...
    This reply was created from a merged topic originally titled Debugging a silent TSUB15.....

    I have a TSUB15 that all lights up, you can see signal coming in, the pass-through to the Tops works fine, but no sound. So I've buzzed out the driver it's fine. I found a fuse on the PCB of the Power Amp but it's fine too, so it must be something deeper. I suspect a Power Amp fault, but to be sure I need to bypass the pre-amp and inject some signal. Trouble is ALTO wont disclose the circuit diags so does anyone know at which point is the signal input(s). I can see a brown and blue coax going to the Power Amp terminal block with a common point on the pre-amp PCB which I suspect is ground so I'm guessing one or both them?
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  • Hello Barry,

    I can see your concern but service manuals and schematics are not available to the public. Only authorized Alto Professional Audio repair facilities and service centers would be able to obtain this type of information. I personally don't have any information about this neither. If you need information on where to service your product or get parts for it, reaching out to our technical support team is the way to go.
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  • Like I explained I already did that and am still waiting for a response
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    • Sorry Chris. I'm in the UK it's that office I called. I'll call back tomorrow thanks again for your support
    • Sounds good. Good luck.
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