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 Post subject: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Thu 23, 2019 2:48 pm 
Member

Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
Perhaps someone can provide a lead on obtaining a schematic on this audio unit.
Its not quite vintage, but getting docs to help my son with a repair appears difficult.

Thanks for any assistance, Alan


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Fri 24, 2019 12:38 am 
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Joined: Jun Fri 15, 2012 2:22 pm
Posts: 124
Location: Wausau, WI
I believe Dayton audio is a house brand of Parts Express. Have you tried contacting them?
https://www.parts-express.com/dayton-au ... e--300-811


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Fri 24, 2019 10:32 am 
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Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
Thanks... I will try them and let you know if any success,


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Tue 28, 2019 3:30 pm 
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Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
No joy on getting a schematic for aid in troubleshooting this gear. It is not available and will not be released. I expect the design is considered TOP SECRET.

However, if any one knows different, I would be happy to hear otherwise. In the meantime, I am going to dive in, one element at a time.

Thanks,


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Tue 28, 2019 4:52 pm 
Member

Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
Main issue blowing 10 A primary FUSE. All lines to the power supply card that are easily disconnected are pulled. A measure of the primary line to neutral resistance is about 1.2 ohms. That may be reasonable for a 1 kW toroid power xmfr. The model number on the xmfr is RM 1000. There is no manufacture name that I can see. There appear to be some line protection MOV's or safety caps. At least 6 in total, 2 pairs of three across the line, perhaps? I'll see if I can post a pix. Alan


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Tue 28, 2019 9:22 pm 
Member

Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
DC Measurements of the transformer winding appear reasonable. It might be worthwhile to measure the AC R at 60 Hz. Would be nice to have a xmfr spec. My target now would be the line filter caps and what appears to be a common mode inductor also bridging the AC line. Looks like they use a custom made discrete AC line filter consisting of just a half a dozen parts, L and C.


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 Post subject: Re: DAYTON SA1000 sub woofer power amplifier
PostPosted: May Wed 29, 2019 4:04 pm 
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Joined: Nov Wed 17, 2010 11:14 pm
Posts: 167
The problem with the unit is power transformer shorted primary winding. Measured Z at 60 Hz is pure real ~ 8 ohms. Now off to find the bad winding or a replacement. Units is a nice toroid wound rated at 1kVA I expect.


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