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Old 06-16-2014, 09:00 PM   #15
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Ty for posting that!

Mine is completely different inside

Maybe cause I have the A2 model without battery charging
function.
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Old 06-17-2014, 08:17 AM   #16
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It actually makes more sense with no battery charging function. The PO either wired the converter backwards or rewired the inside backwards. Having no battery charger function means it would have appeared to work (lights and other non-electronic stuff) and wouldn't discharge the battery when plugged in.

If they wired it backwards, the loads and the battery plus would go to the large lug (white in the schematic), battery minus to the red wire, ground to the fuses (blue wire in the schematic). A picture of the wiring may help us if it is this.

If it's been rewired internally pics of the insides of the converter would help us also. Try to get as much detail of components and wiring as possible, maybe one overall shot and several detailing the wiring and components. I'm particularly interested in the wires coming out of the transformer going to the diodes (Diode1 and Diode2 in the schematic), and how the other side of the diodes are connected, these are what I think are backwards. It looks like the mfr didn't use a circuit board so it should be very easy to unwire the diodes and reverse them.

I'm curious, how does the battery get charged while plugged in? Is there another converter somewhere?
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Old 06-17-2014, 11:39 PM   #17
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This is the inside of mine.

I dont have it with me right now as I pawned it off
on one of our Bio Med guys at work. Hes got it on his bench
but with it and the schematics being made even before he was born,
has got him scratching his head a bit .. lol

Sorry for the crude paint shop work on the pictures. I hope it makes sence

1 is the inside of my unit
2 is how it tests with the multimeter when AC power is added
3 is how its suppose to be from factory and .. how it is when
a 12 v battery is connected to the unit and AC power is disconnected

When you connect 120 v AC to the converter.. the polarity switches down the wires blowing fuses to everything except standard 12v light bulbs.

If you look at my pics ... this is why I believe as well, that someone has simply connected the wires wrong/backwards from the transformer to the switch
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Old 06-18-2014, 12:15 AM   #18
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Quote:
Originally Posted by Luv2go View Post

I'm curious, how does the battery get charged while plugged in? Is there another converter somewhere?
Im doing a full teardown and rebuild on a 71 Barron pop tent.
Solar panel and grid are in the works while camping and I have a really good
deep cycle charger at home .

lol.. but don't want to hook anything to this until I get this converter straightened out .
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Old 06-18-2014, 01:30 AM   #19
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Those things on the plate at the top of your pics are diodes. The relay switches between the white wire from the battery and the blue wire on the right which should go to the diodes cathodes.

I bet it goes to the transformer's center tap and the white wire on the right that connects to your label -12VDC goes to the diodes cathodes. Switch those around and it should work right.

This all assumes the schematic is right and the circuit is a half bridge center-tapped rectifier.

Tell your Bio Med guy to think very basic center tap transformers and half wave rectifier diodes, he's probably used to working on much more sophisticated stuff, he should be able to see the problem pretty quickly. The issue is most schools nowadays just touch on this basic stuff because nobody uses unregulated linear 60HZ transformer power supplies any more, it's all high frequency switching regulators with IC's and circuit boards.
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Old 07-08-2014, 05:38 PM   #20
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Sorry it took so long to reply. Converter is fixed! All it was , was the neg and pos had to be switched .. on the switch. lol .
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