| Electronics > Repair |
| Xantrex/Sorensen XHR 40-25 schematic? |
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| coppercone2:
lol if someone made me fix this, I would replace all the silicon on this thing and check all passives under HV and hope it works. stomach ache from thinking about the schematic . the only thing I know is that I would have to buy extra pace desoldering tips for this job but for BS parts like 317, 347, gates, 351... its not really big money if you are patient and replace. that might give confidence enough to feel like you can trouble shoot it. for the gates that are like 10$ on ebay breadboard test it, but honestly with a desoldering tool, like a 1.5$ op amp.. Id just fuckin replace it. if you can get it to a specific fault, it might limit the amount of trouble shooting. probobly the diodes too. only tip is clean the board from flux as you go along but not too clean and do a final clean when you are done power transistors too, if they are cheap, replace IMO. If you gotta import it from bulgaria test it if you do this crazyness, i recommend printing out the entire part list, getting two color of highlighter, and marking parts that might be suspicious with 1 color and another color if tested or replaced. but you need to test the HV parts with some voltage probobly or it might be another unknown. |
| ifonlyeverything:
--- Quote from: coppercone2 on November 23, 2023, 01:08:20 am ---what was the problem with it to begin with? Not really sure how they work too well. I kinda figured out the feedback loop and figured where the fault might be. but... power rails ok? and my socket looked fine, it even removed OK, its just messed up. those socket suck because they are the 2 leaf things not the little hole but you got a much harder supply because its 1kV. Mine is 30V. Anything over like 100 volts makes it mad complicated. 1kv exceedingly so. new failure modes for parts. Even resistors can do that shit where they start failing at a high voltage like 750 volts. Also mine had a mains connector that was not soldered in! it was press fit in for most of its life with almost no solder on the pin. It started arcing on me after I fixed the unit, luckily all it needed was a dash of solder. Sorensen QC must have had a bad day. I had enough HV shit since I fixed the miller dynasty welding machine (it has like 800V rail). Weird shit was going on there, far away insignificant looking components like ceramic caps causing problems. Honestly the way to test this would be to desolder each part, bias it with HV supply, make sure its OK.. anything on the HV rail IMO can be really suspect but I don't have much experiance with that. --- End quote --- Previous owner said it would click on and off repeatedly with no apparent power. There's only one relay on the PCB (K139) which switches in/out 20 ohms of resistance to slow inrush current. I however didn't plug it in (yet.) Hopefully the problem is isolated to this relay, its power supply or its coil control logic, because these sections don't look TOO daunting. Mine is only the 40V 25A model, so no worries about high voltage. |
| coromonadalix:
you could be surprised, dont assume thet psu is rinning on low voltages normally the 120vac is rectified to at least 160vdc or doubled 320 347vdc to create a stable dc supply to be pwm'ed to the control stage ... |
| coppercone2:
oh yeah but its not a 1kV regulated output stage thankfully |
| ifonlyeverything:
--- Quote from: coromonadalix on November 23, 2023, 02:09:18 am ---you could be surprised, dont assume thet psu is rinning on low voltages normally the 120vac is rectified to at least 160vdc or doubled 320 347vdc to create a stable dc supply to be pwm'ed to the control stage ... --- End quote --- Oh yeah definitely, the PFC boost stage looks like it's putting out close to 300V. |
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