Dragon 32 PSU board picture, "48086?" "Issue 6?"

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sixxie
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Dragon 32 PSU board picture, "48086?" "Issue 6?"

Post by sixxie »

Been sorting through my various board, getting most of them working (but finding at least one dead regulator). Noticed this wasn't on the PSU Pictures page.

It uses a UM1233 modulator, which I've not seen on any of the others. Weird. Also, terrible picture in this case...
Dragon 32 PSU board, top
Dragon 32 PSU board, top
dragon32-psu-board-top.jpg (480.99 KiB) Viewed 349 times
Dragon 32 PSU board, bottom
Dragon 32 PSU board, bottom
dragon32-psu-board-bottom.jpg (434.84 KiB) Viewed 349 times
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unumlapis
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Re: Dragon 32 PSU board picture, "48086?" "Issue 6?"

Post by unumlapis »

Is the REG3 isolated? Asking since typically this one shouldn't be touch the cooling plate since it shorts the PSU board.
sixxie
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Re: Dragon 32 PSU board picture, "48086?" "Issue 6?"

Post by sixxie »

I did wonder about that, just hadn't got around to unscrewing it. It all looks like it's been that way since it was made, but it's worth a go.
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robcfg
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Re: Dragon 32 PSU board picture, "48086?" "Issue 6?"

Post by robcfg »

Ciaran,

Thank you for the pictures!

They are indeed interesting. It seems that the power part is the same and they made a new board issue to accommodate this particular RF modulator model.

Cheers,
Rob
Last edited by robcfg on Mon Jun 15, 2020 6:37 am, edited 1 time in total.
prime
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Joined: Fri Apr 10, 2009 1:40 am

Re: Dragon 32 PSU board picture, "48086?" "Issue 6?"

Post by prime »

Reg3 looks like it has the insulation kit there, I think it consisted of a piece of mica? and an insert washer for the screw hole, along with some thermal paste (the white stuff round it).

Something like this : https://uk.rs-online.com/web/p/heatsink ... s/7128225/

Cheers.

Phill.
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