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Daiwa power supply repair info needed

 
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fixit1
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PostPosted: Fri Jun 08, 2007 7:10 pm    Post subject: Daiwa power supply repair info needed Reply with quote

I need a schematic for a Daiwa SS-330W power supply. I have contacted all known dealers and repair depots and the USA Distributor (Comet) and have received nothing. It is used with radios and just quit one morning when I turned it on, only after about a year of use. This is a switching type supply providing 30 amps at 13.8vdc (variable). If you could CC: me with a reply at mkt underscore 55c at swbell dot net, I would very much appreciate it.
Many Thanks!
Bill
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hk4cze



Joined: 05 Nov 2007
Posts: 1

PostPosted: Mon Nov 05, 2007 4:44 pm    Post subject: Reply with quote

I had exactly the same problem with my Daiwa SS_330W I checked the fuse and It looks fine I am in Sth America no Daiwa dealers here. Did you fix yours. I would appreciate any suggestions
Thank you
Smile
Jorge
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wud-wurks
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PostPosted: Sun Dec 23, 2007 12:22 pm    Post subject: DAIWA POWER SUPPLY TYPE SS-330X Reply with quote

I badly need schematics and pcb layouts for the above unit. Sad

I have several of them, running a complex communications system and having recently won a contract to keep the system up, I have found on reviewing the technical information available to me there is no technical information on the power supplies. HELP! Rolling Eyes
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sun Dec 23, 2007 6:27 pm    Post subject: Reply with quote

Do not have the schematic, but looking at the pictures on the net, it is not that complicated of a device as it is a standard adjustable regulated power supply. More than likely there is a common device failure.

If/when there is an absolute need with no schematic available, basic skills along with "reverse engineering" is the way to go-- of course if worth the cost in time?

Yes, it can be time consuming and a challenge, but it is possible to redraw parts if not all of ANY circuit on paper to aid in troubleshooting.
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PostPosted: Fri Jun 25, 2010 10:40 am    Post subject: Daiwa SS-330W power supply Reply with quote

Check Resistor R8 = 390k - 0.1W, located next to Power-Transistor Q3, 2SC5353 with the small heatsink.
R8 goes open circuit, replace with 390k - 0.5W version !
73 de HS0ZEU Man
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