Samson XML610 pwr mix

[Phil Allison]

Hi,

Chinese made, 12 input chs, SMPS with Class D amp rated at 2x300W @ 4 ohms, still current model.

One of the above on the bench, SMPS allegedly blew at switch on. Mosfets shorted plus drive IC, buffer transistors etc.

The class D board appears to be undamaged but need working SMSP in order to test as it delivers all the low and high DC voltages. Main DC rails ought to be about +/- 75V.

Anyone familiar ?

Is the SMPS a known lemon ?

The design looks a bit cheap and nasty.


.... Phil

 

[John-Del]

On Saturday, June 13, 2015 at 4:15:53 AM UTC-4, Phil Allison wrote:

Hi,

Chinese made, 12 input chs, SMPS with Class D amp rated at 2x300W @ 4 ohms, still current model.

One of the above on the bench, SMPS allegedly blew at switch on. Mosfets shorted plus drive IC, buffer transistors etc.

The class D board appears to be undamaged but need working SMSP in order to test as it delivers all the low and high DC voltages. Main DC rails ought to be about +/- 75V.

Anyone familiar ?

Is the SMPS a known lemon ?

The design looks a bit cheap and nasty.


... Phil

No specific information on that unit, but I normally decide the repair strategy based on how many I'll see for repair. Being a current model, there's not a big history available so you'll not know how many more you'll eventually see (if any). For the first one, I'd be more inclined to try to find a replacement smps if it's a stand alone unit and can be gotten fairly cheaply, particularly if the mosfet took out so many parts as yours did. If I see two of these in my small hole in the wall shop, then it's a pattern and I'll spend 10 hours on the next one to find out what happened, why, and write a rebuild/upgrade procedure to make the following ones cheap and easy and hopefully upgraded.