8 faulty power supplies Roal, Need to help. - Page 1
Forum section: electronics / repair

author: RFerri
author_rank: Newbie
timestamp: October 10, 2023, 01:55:36 am
content: Hello,I need your advice. I have 8 faulty power supplies that I need to repair. I don't know exactly what the problem is. But the power supply provides electricity to the light bulbs of the equipment, but does not start the equipment.Roal 231ARoal 232Roal 231BUnfortunately, my experience in searching on the Internet turned out to be sad; companies are asking for repairs 2 times more than this power supply costs. I live in Maryland, does anyone know of a company in or near this state that specializes in repairing industrial power supplies. I'm also looking at inexpensive options within the US.Thanks everyone.

author: Hamelec
author_rank: Regular Contributor
timestamp: October 10, 2023, 07:47:32 am
content: without any information about brand, model number, failure nobody can help you.DIY?

author: p.larner
author_rank: Frequent Contributor
timestamp: October 10, 2023, 10:29:26 am
content: maybe we need xtall balls on this one as no faults or model numbers listed etc,what a time waster!.

author: Zenith
author_rank: Frequent Contributor
timestamp: October 10, 2023, 12:22:23 pm
content: I entered "industrial power supply repair" into Google and loads of companies came up.I'd guess if you've got some piece of industrial equipment with a bad power supply, you generally don't care too much what it costs to repair, in view of the cost of downtime, not being able to service a customer, and so on. Repairing a power supply is cheaper and less trouble than buying new equipment.Furthermore, repair is in general, less of a thing than it used to be. Things like inverter welders are not repaired, unless they are top end, it's cheaper to buy a new one than repair a broken one. Years ago TV repair was a thriving business. It's pretty much vanished.You're much more likely to get satisfactory replies to questions like this if you give specifics, such as the brand and model number, and what the power supplies are used for.

author: RFerri
author_rank: Newbie
timestamp: October 10, 2023, 02:58:28 pm
content: You are right, I apologize for the incorrect description of the problem. I have corrected.

author: canadaboy25
author_rank: Regular Contributor
timestamp: October 10, 2023, 06:22:04 pm
content: As mentioned by others, in an industrial setting where downtime can be costly, it sometimes makes sense to get equipment repaired right now, even if the repair costs more than new equipment.However, since you expressed frustration about the repair costing more than a new supply, it seems that you are not in this situation.After a short look online, it seems the schematics for those supplies are not available. Not surprising either.Either you would have to disassemble the supplies and start reverse engineering the schematics, or the best advice anyone can give is to check fuses, diodes, transistors, and caps.

author: Zenith
author_rank: Frequent Contributor
timestamp: October 10, 2023, 10:28:18 pm
content: Manufacturers may give out technical details to established repair companies they wouldn't share with the public at large.Several things about this strike me as odd, such as why RFerri turns up with 8 industrial power supplies that suddenly need fixing. Has he accumulated these over time or has fate dealt him the perfect worst hand and had them all fail at once? That's his affair and he either wishes to share further details or he doesn't.Point 1:These Roal power supplies may conform to a semi standard, in that other makers' products may fit in the same space and give the same performance. They could be more or less expensive or have better or worse names. It's hard to imagine a seller of industrial gear would rely on a single supplier for something like a PSU. He might get in touch with the maker of his equipment for suggestions as to substitutes.Sub Point 1:He might be able to buy new replacements from Roal or others. Aliexpress is worth a look.Sub Point 2:He may be able to have have them repaired for an acceptable price by an established repairer. They may not be repairable for a reasonable cost, such as having faults which caused a hole to be blown in the PCB. It could be fixed but no one would guarantee such a repair. He has to approach companies advertising these services on the WWW.Sub Point 3:There's a used market in these things, as shown by a quick look on Google. About $200 will get you a used one with a 30 day guarantee, which is about as much as you can expect from a second hand unit the seller genuinely believes is working.

author: CaptDon
author_rank: Super Contributor
timestamp: October 11, 2023, 01:47:07 pm
content: What do you mean "it supplies power to light the light bulbs and doesn't start the machine"? That seems like an out to lunch statement to me. Those supplies you list are computer mainboard power supplies not 'lightbulb lighters'. They seem to have perhaps 5 output voltages.

author: RFerri
author_rank: Newbie
timestamp: October 12, 2023, 09:27:02 pm
content: These power supplies are used in PXI chassis. I am not an electronic equipment repair specialist. When you press the start button, the chassis does not start and the modules do not work, but the green light blinks red and the cooling fans do not turn on. I thought the problem was with the fans, but I checked since I have new spare fans. The chassis itself does not start and the light indicates that there is a fault in the power source. I opened the power supply and carefully examined every part, all fuses, diodes, transistors and caps are in order and there are no signs of excessive heating anywhere.

author: fzabkar
author_rank: Super Contributor
timestamp: October 12, 2023, 09:39:40 pm
content: Something is wrong with the label ...https://i.ebayimg.com/images/g/nU0AAOSwfzpkBxaw/s-l1600.jpg

author: p.larner
author_rank: Frequent Contributor
timestamp: October 13, 2023, 03:45:44 am
content: how about some model numbers and pics ect,the image from my crystal ball is fuzzy.

author: max.wwwang
author_rank: Frequent Contributor
timestamp: October 13, 2023, 05:33:08 am
content: We (I mean the rest of us other than me) are desperately wanting to help you however context hungry to death.

author: Zenith
author_rank: Frequent Contributor
timestamp: October 13, 2023, 10:01:10 am
content: Quote from: RFerri on October 12, 2023, 09:27:02 pmWhen you mentioned light bulbs and starting, I was thinking along the lines of something used in a mine or digging equipment.https://www.ni.com/en-gb/shop/category/pxi-chassis.html?productId=118732These are expensive automated test systems, with prices starting from about $1,500 and up to $25,000 for the chassis, then you need a controller, starting at $1,000 and then the modules again starting at about $1,000. Then there's the software. A big money game and something which would be used on a production line or in a well-heeled R&D setting. Normally in such a context you wouldn't mess about, you'd just buy new PSUs or have the maker fix it.

author: RFerri
author_rank: Newbie
timestamp: April 02, 2025, 03:29:12 am
content: Thanks everyone, in the end I spent 3 months and in my free time studying and was able to repair all the power supplies. Thanks everyone!

author: BILLPOD
author_rank: Frequent Contributor
timestamp: April 02, 2025, 06:42:52 pm
content: Quote from: RFerri on April 02, 2025, 03:29:12 amGood Morning RFerri, Good you fixed them. Could you share how you facilitated the repair