Appreciate if anyone can give my any help on my faulty mixing desk
I have an Alto PM12 Dragonfly mixing desk which has stopped working. I'm told the switch mode power supply is faulty and irreparable. Been in touch with Alto who tell me they don't make parts for this model and try searching the web for any spares or repair units.
Any help appreciated
I have an Alto PM12 Dragonfly mixing desk which has stopped working. I'm told the switch mode power supply is faulty and irreparable. Been in touch with Alto who tell me they don't make parts for this model and try searching the web for any spares or repair units.
Any help appreciated
Where are you?
Were you told by a repair tech that the switcher was beyond repair? Or were you told by Alto that the switchers were "not repairable"? The latter usually means they don't even try to fix them, they just buy them from an outside vendor.
Any schematics?
Were you told by a repair tech that the switcher was beyond repair? Or were you told by Alto that the switchers were "not repairable"? The latter usually means they don't even try to fix them, they just buy them from an outside vendor.
Any schematics?
Hi
Over in the North of England
Told by a repair tech it's not repairable.
See if I can dig out a schematic
Thanks for your help
Over in the North of England
Told by a repair tech it's not repairable.
See if I can dig out a schematic
Thanks for your help
I usually can repair them, but failing that, the needs of the mixer should be pretty common. I will assume something like +/-15 to 18vDC, +48v for phantom, and maybe +5 or +12 for things like LEDs of any digital stuff. perhaps the existing supply has connections labeled?
From that point we may find some other similar mixer has supplies available we could drop right into place. I have a peavey board in the shop with a nice compact switcher that would be useful in many other applications, as an example. Some dead piece of rack gear might have a working switcher in it.
From that point we may find some other similar mixer has supplies available we could drop right into place. I have a peavey board in the shop with a nice compact switcher that would be useful in many other applications, as an example. Some dead piece of rack gear might have a working switcher in it.
Of course - everything is repairable, but whether it is sensible, or economic to do so is usually the question.
Presumably Alto and any competent repair person wouldn't want to spend the time (and your money) - on fixing this item.......
Presumably Alto and any competent repair person wouldn't want to spend the time (and your money) - on fixing this item.......
That isn't totally fair. Clearly there are SMPS beyond reasonable repair, but a quick check reveals shorted rectifiers on the secondary, and repair is effected easily and within bench minimums. Loss of filtration is simple to diagnose and repair. It takes little time to determine it is blown up and NR, so if I can fix it quickly, I save the customer down time, I save him the cost of an entire new SMPS (if one is even available) or worst case, a whole new mixer.
As a former Fender warranty station, an example of corporate policy was their Passport PA system. It has a large SMPS. originally, they sent us schematics etc for the SMPS, and we repaired them. Later they decided to make the SMPS a replace only part. The rationale was that many amp repair guys were not familiar enough with SMPS to reliably fix them. Later documentation removed the SMPS specifics, replacing it with a part number for the whole SMPS. Considering the $300 pricetag n the SMPS unit, it was not about value being too low. I for one am loathe to discard $300 items.
A competent repairman doesn't automatically discard things without determining if the repair would be simple.
As a former Fender warranty station, an example of corporate policy was their Passport PA system. It has a large SMPS. originally, they sent us schematics etc for the SMPS, and we repaired them. Later they decided to make the SMPS a replace only part. The rationale was that many amp repair guys were not familiar enough with SMPS to reliably fix them. Later documentation removed the SMPS specifics, replacing it with a part number for the whole SMPS. Considering the $300 pricetag n the SMPS unit, it was not about value being too low. I for one am loathe to discard $300 items.
A competent repairman doesn't automatically discard things without determining if the repair would be simple.
I quite agree with the comments made by Enzo - but the number of good repair guys out there is diminishing fast.
Many 'service centres' cannot fault down to component level, so if a replacement board is not available, or simply too expensive - the repair is not done.
The Fender Passport example given might be a good example, a quick Google found this system can be purchased for £283 in the UK (about $450?). So who would spend $300 plus diagnosis and fitting time on a repair?
Car repairs seem to be done along the basis of 'when in doubt - change it out' - guaranteeing huge repair bills.......
Many 'service centres' cannot fault down to component level, so if a replacement board is not available, or simply too expensive - the repair is not done.
The Fender Passport example given might be a good example, a quick Google found this system can be purchased for £283 in the UK (about $450?). So who would spend $300 plus diagnosis and fitting time on a repair?
Car repairs seem to be done along the basis of 'when in doubt - change it out' - guaranteeing huge repair bills.......
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