Artesyn 3T12AP DC to DC regulator
Hello, a friend asked me to take a look at the DC-DC converter, it has no output power, he told me this is from crane control operations. It should convert from 48VDC to 24VDC, but the output is 0V., I checked the components like diode for a short, but they are all good. Does anybody know where to start? And my big question is should the board start working once i connect 48V automatically, or should there be some kind of "signal" .
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It looked like the output diode pin was not connected, but i see it is connected with the tab not the pin.
You may want to resolder the input, output and return connections, they do not look that good, I would check R9, I can't make out any value
I don't see any control signal, but it may need a load to workLast edited by R_J; 05-27-2025, 07:29 PM. -
Looks like there is an "inhibit" pin (E9) that needs to be grounded to turn it on if you didn't do so already?Last edited by eccerr0r; 05-28-2025, 12:16 AM.Comment
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it looks like shit,
clean it with IPA and then check none of the corrosion has opened any tracks.
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Check the LM723 and see what going on around there. Is the output dead dead, or you getting something like 0.1 or 0.2V?Last edited by CapLeaker; 05-28-2025, 04:43 AM.Comment
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it is 0.2VOriginally posted by CapLeaker View Post
...the quieter you become the more you are able to hear...Comment
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So i shoud ground E9 to gnd and than try?Originally posted by eccerr0r View Post...the quieter you become the more you are able to hear...Comment
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I also found this resistor to look burned, it reads 0.6kOhm but from the color chart it shoud be like 60ohm not in kOhm, am i correctAttached Files...the quieter you become the more you are able to hear...Comment
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Concur. That thing is on the order of 25 tears old, and cleaning it will help see what is what. The PCB looks singed under 1 or more of those 2W resistors. Have you verified the 2N5038 is not shorted or open?Originally posted by stj View Post
Judging by the model number and the BJT switch device (2N5038), that looks to be a 3T designed by Boschert Inc., ca 1980, when I worked there (Robert "Bob" Boschert was, then, VP Engineering), though not with that project. You may have to create your own schematic. Boschert was bought by Computer Products, which merged with (IIRC) Zytec to form Artesyn, which was bought by ...PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Well i am cleaning peace by peace and under one transistor found broken trace. Also colector leg was broken, i will replace it and repair the trace, maybe this will do the trick.
2N5038 is fine, not open or shortedAttached Files...the quieter you become the more you are able to hear...Comment
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Hm… MPSA06… PNP transistor. Should be easy to replace. The 2n5038 is quite a hefty NPN transistor for this remote.Last edited by CapLeaker; Yesterday, 07:34 PM.Comment
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Looks like it's available through Mouser and Digi-Key, but in Croatia? It's made by On Semi. IIRC (from ~45 years ago) that part is higher than the common maximum voltage for a PNP BJT.Originally posted by CapLeaker View PostPeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************Comment
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The 2n5038 is a very common 140v NPN type of transistor it crosses over to a lot of other transistor numbers even “modern” TO3 numbers. No problem.Comment
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