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Thread: Alto mixing desk issues

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    Alto mixing desk issues

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    Hi all
    I'm a newcomer and slowly putting a studio together with resources available.

    The mixing desk I have (Alto PM12 Dragonfly) has given up the ghost and I'm finding it difficult to get someone to repair it.
    I'm told the switch mode power supply has gone and is irreparable.

    Anyone know anything about these ?

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    Most likely it's cheaper to replace than fix.

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    It may be a blessing in disguise.

    Instead of spending money on repairs, invest it instead on an audio interface.

    If you are getting into recording, that would be a more worthwhile investment.

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    Who told you the PSU cannot be repaired? Not the makers I bet, more likely someone who knows jack S about them and doesn't want the job!

    That said, SMPSUs often "cook" and the complete unit need to be replaced, hopefully for a better design! (personally I would build an outboard AnneLoggy 50Hz supply but I suppose that is beyond your capabilities?). There was an otherwise excellent Soundcraft mixer that had a notoriously feeble PSU in it.

    As stated, for home recording an interface is the usual and best choice but if you have a real need of the mixer I am sure it CAN be fixed. Going to cost though!

    Have you contacted Alto?

    Dave.

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    Thanks for your comments Dave
    Yes been in touch with Alto who tell me they don't make replacements for this model any more and my best bet would be to search the web for spares or repairs.Appreciate if you could send some details on the Anneloggy 50hz supply maybe I could put something together !

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    Quote Originally Posted by Dixon2000 View Post
    Thanks for your comments Dave
    Yes been in touch with Alto who tell me they don't make replacements for this model any more and my best bet would be to search the web for spares or repairs.Appreciate if you could send some details on the Anneloggy 50hz supply maybe I could put something together !
    There is an excellent schematic for a dual 17V* supply with regulated spook juice in Douglas Self's t'riffic book, Small Signal Amplifiers. If you cannot easily get hold of a copy PM and we will sort something out.

    *In case you are wondering, not a typo! Dropping the supply to chips such as Nee's and TLs by 2x1V reduces headroom by a paltry dB or so but apparently boosts reliability to near zero failures!

    Dave.

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    If you didn't already, it might be worth asking Alto if a service manual is available for that board, which should include schematics. I took a quick look at my most common places I find service manuals and didn't find any.
    I've a feeling that replacing/fixing may not be too straight forward as that board also has digital effects which may run off a different set of voltages than the analog part of it.
    Mark.......

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    Quote Originally Posted by arcaxis View Post
    If you didn't already, it might be worth asking Alto if a service manual is available for that board, which should include schematics. I took a quick look at my most common places I find service manuals and didn't find any.
    I've a feeling that replacing/fixing may not be too straight forward as that board also has digital effects which may run off a different set of voltages than the analog part of it.
    Good point Mark. However I have tended to find that the B'stds that discontinue products very quickly do not keep spares are the same b'stds that take a Dog in Manger attitude to supplying service data! When Behringer (who else!) told me the BCA2000 was ceased production I said "ok then, sell me a couple of spare boards and a schematic if you are not making it any more" Would they bollox!

    Did not know of a digital side! Not likely too big a problem. If the digital juice demands is fairly low a 7805 off the LT supply should suffice. If a bit heavier OP can investigate DC-DC converters that "uptransform" current. There is almost always a way!

    Dave.

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    Trying to fix a board like that is like trying to wash a facial tissue for reuse.

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    On an off chance the switching power supply was just a guess and not confirmed, have you checked the fuse in the line cord jack?
    Attached Images Attached Images fuse-jpg 
    Mark.......

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