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Can someone help me determine this power supply output?

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Can someone help me determine this power supply output?

Postby AlexTs » Sun Mar 25, 2018 1:10 am

The 100-240V~50/60Hz power supply switching module broke into pieces of a 2.1ch amplifier (SW-G2.1 1250). I want replace the board with another same output switch. Can someone help me determine this power supply output?

https://imgur.com/a/WhkGZ" target="phpbbpopup
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Re: Can someone help me determine this power supply output?

Postby ef37a » Sun Mar 25, 2018 7:09 am

AlexTs wrote:The 100-240V~50/60Hz power supply switching module broke into pieces of a 2.1ch amplifier (SW-G2.1 1250). I want replace the board with another same output switch. Can someone help me determine this power supply output?

https://imgur.com/a/WhkGZ" target="phpbbpopup

Not from that picture Alex, no. This is one of those "If he knew what he was doing he wouldn't have to ask" questions!

It should be fairly easy to link the print on that broken board and get it working again at least well enough to determine the output voltage but that would mean having a 'kitchen table lashup' with mains voltage on it and, WTGR, I don't think you are experienced enough to do such work. I certainly do NOT advise it.

Look at the speaker's amplifiers. They will have large capacitors in them with a capacity and voltage rating such as "2,2000uF 33V" the working voltage will be a few volts below that. Are there no indications of supply ratings on the speakers or in a handbook?

Dave.
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Re: Can someone help me determine this power supply output?

Postby MikeGorman » Mon Apr 16, 2018 7:10 pm

After a bit of Google searching, I found what appears to be the service manual for this speaker system.
https://www.yumpu.com/en/document/view/21390796/sw-g21-1250-service-manualpdf-genius

From this, it looks like the PSU output is 17.5V at 2.8A, it is a separate PSU PCB. It is classed as a switched mode Power supply which switches lethal voltages, so I wouldn’t suggest trying to fix this if you haven’t got experience with this type of supply already.

A quick search on CPC’s site found an 18V 2.8A external PSU that would likely work as a possible replacement :- http://cpc.farnell.com/w/c/electrical-lighting/batteries-power-supplies/power-supplies/ac-to-dc-converters/ac-adaptors?output-voltage-output-1=18v&output-current-output-1=2.8a, but you would also need a suitable power socket and be able to fit this into the case.

As you can pick these systems up complete for less than £60 on eBay, I would suggest that it is not worth your time or money to try and make a repair on this system, just keep them as spares for when the new one breaks perhaps.

Regards

Mike
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