Power Pro 1 popped the breaker

[nmac]

With your experience- and history here is super helpful…ya all the other parts Im seeing that might be damaged-I give but it was worth a try…I now agree, Im likely buying a new power supply thank you.

[RFGuy]

With your experience- and history here is super helpful…ya all the other parts Im seeing that might be damaged-I give but it was worth a try…I now agree, Im likely buying a new power supply thank you.

Yeah, I always try to fix something if I can. I just wanted to let you know that this looks like a difficult repair to me. Major IC's are usually marked and you can usually find a replacement. IF any of the SOT23's are damaged then it can be difficult to know which part number to replace them with. Also surface mount R's and C's can be damaged and you wouldn't necessarily know it without measuring them which can require removing them and reinstalling them. Impossible to know replacement surface mount cap values without a schematic. I don't like the cost of the PowerPro and the replacement cost of modules is too high IMHO. I can't find the previous forum post, but someone posted before about how much their replacements cost. I believe the LCD control module is sold separately and the power supply module is sold separately. Looks like you only need the latter. I can't remember if it was ~ $300 for the power supply or ~ $500 for it. IF that fixes it, then worth it, I guess, considering how much a new PowerPro costs. I could never get over the heartburn of what a PowerPro costs, i.e. you are essentially paying $2k ($2.8k now under new owner) for a motor and quill. The guts from Teknatool used to cost around $500 for this if you bought it off of the street, e.g. to retrofit a bandsaw or someone else in your shop. Shopsmith has to buy from Teknatool and it just seems like a steep markup to me to pay 4x more for what you get from Shopsmith. Others disagree with me on the forum for this topic and that is okay. I am happy that I stayed with my conventional headstock. I guess that is something to consider, i.e. to weigh whether to go the PowerPro repair route, or if that is too expensive to find a replacement conventional headstock off of the used market. Either way, good luck with it. Of course, conventional headstock repairs may become impossible in the future - I don't know how long the mothership will continue to sell replacement parts for it.

P.S. I found a thread that indicates the replacement cost for a new PowerPro power supply from Shopsmith is $572.

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[DLB]

With your experience- and history here is super helpful…ya all the other parts Im seeing that might be damaged-I give but it was worth a try…I now agree, Im likely buying a new power supply thank you.

The last I recall a new Power Supply / Controller was around $600. Shopsmith is currently showing it "Not Available" so it is not priced, I expect that it has gone up. IIWM I would contact SS CS since the part is still in use(?). Assuming it is still in use, that will either be a mistake on the web site or they should have a pretty good idea when they are expecting a shipment. (They have been talking about supply chain issues, this could be an example of that if they are short.)

In the past there has been an option to return your old PS for repair. That is not inexpensive, but typically a bit less than buying a new one. IIRC it must go to SS first and they manage the repair with their supplier. I'm not sure if you'd still have this option after attempting repair.

There is a lot of evidence in your photos of an overload, which can be caused by an internal or external fault. IIWM I would at least do resistance measurements on the motor. I haven't done this, but I think you have six power wires meaning three pairs of drive lines with returns. Each pair drives one or more sets of coils, so I'd expect low resistance between the pairs and infinite resistance between any single drive line and any other (except its return) and the motor chassis. If you check this, please confirm this is correct.

Do you see any indication of manufacturing date, either on the PS itself or the headstock? I'm wondering about what I'm perceiving as possible dried out heat sink compound. I'm not a big fan of what I see in your photos regarding how the high wattage (hot) components are cooled.

- David

[RFGuy]

Looking at the pics again...is that a zip tie (circled in red) that melted on top of the toroid inductor??? You can find some strange things when electronics fail. I guess where this one zip tie melted, but the other 4 did not, is also the area of the start/end of the toroid inductor. Looks like it might be the same spot where it blew out a trace on the bottom. Didn't say this earlier, but the discoloration of the toroid inductor probably indicates varnish failure. Given the high heat environment this power supply operates in, I don't think I would trust it even if you could get the other electronics replaced. Only a matter of time before the varnish fails and you get a partial short of some of the inductor windings.

Sorry this happened to you, but thanks for posting. Never seen inside the power supply of the PowerPro...good to finally be able to associate the internals with all of my speculation in the past of what the motor driver circuit could be:

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