Manson DPD-3030 PS - modifications possible?

[beanflying]

Fairly happy with the button look. No real chance of accidentally bumping them but still an easy flat fingertip press. Still need to finish the mounts and drill in a hole for the led (not using a surround now just a 3mm plain).

Break out the nibbler and lop about 10mm of the Pot support which is over built so a trim won't hurt. Then the PCB will sit about 1 or 2 washers worth in front of the plate with a couple of nuts and bolts to hold it.

[Shock]

Made any more progress?

[MarvinTheMartian]

Hi beanflying & Shock!

You're putting me to shame (and losing me a bit on switching the load on/off, but I'm only new - kits only to till now  ).

I've yet to even crack open the case on the Manson and look inside (thanks for the photos beanflying and for the diags/info Shock)  .

I'll have to pull my finger out and get started on changing the pots to 5-turns. The rest might have to wait until I've more experience/knowledge.

I'm currently finally putting together the Altronics R-C decade box 'K7520' I bought years ago (too many other things going on or just too tired to get stuck in ) and then push on to finishing the Energy Meter kit 'K4600' I bought years earlier than the decade box. 

Looking forward to seeing any progress you guys make on these mods. 

Cheers,

MarvinTheMartian

[beanflying]

Hi Guys,

sorry other projects and earning a $$ have got in the way of any more progress. I do have a stash of 10 turn Pots to add to the voltage setting. Should get a chance to get back to it later this month once my silly season dies down. 

[benryanau]

Dunno exactly what went on, but I blew both outputs within a few days working on SLA's.
It's sat in the corner for 5 odd years since, without the schematic I haven't been real keen to sort it myself.
The failure mode appears to be the output is dead-shorted - all looks well but just as if there's a fat jumper bridging +/- OP.
Think I had a look and saw maybe a heavy diode or such roughly jammed across the back of the +/- output's binding posts (internally).
One each. And if the supply is enabled with current limit is set max it's not long before there's a burning smell.. and I reckon it might have been the diode-like items.

Unusually disinterested and disheartened with the whole thing, thought I had a keeper on the bench.

But.. aside from my warnings about backfeeding or reverse polarity from sources, if there's some wisdom around that can offer any ideas?
Schematic would be nice

Cheers
ben

[Shock]

Reverse polarity plus reverse voltage on the inputs?
The schematics are not public, I'll send you a PM.

[jasom]

Hello guys, I know this is old topic but. I have one of this DPD-3030 and I want to replace that pots. Can You help me if anyone replacing that whitch type use as replacement? Thanks

[m3vuv]

In the past ive used automotive 12v relays to switch outputs of psu's,bog standard are 30a,get a glo plug relay and some are good for 75a,readily available at scrap yards too as pocket parts!

[jasom]

Hello, You replace Potentiometer too? If yes, what type You use? Thanks