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Kawai K3m - missing rare part. does anyone make custom pieces? (Update)

Posted: Wed Oct 02, 2019 4:29 pm
by part12studios
UPDATE: So my research has discovered that the part I'm looking for is a Sanken Bridge Rectifier. I still don't know the particular specs of it, but I'm digging deeper.

QUESTION: Is there not a company or craftsman out there who could effectively make component pieces custom? It seems like these are pretty simple pieces of material. Not downplaying accuracy and such, but even if the parts were larger because of human involvement vs robots making things, couldn't someone make a resistor, a diode or (in my case) a Sanken Bridge Rectifier? If I knew someone could make the parts I need I'd certainly be willing to spend a lot more than $0.88 for that custom replacement component.


-- original post --

So I have had my K3m for awhile and love it. It's been in great shape and worked well, however recently it got flaky and I believe I've isolated the problem, but I am not sure where to find this part and what to call it.

I believe this device is an AC to DC converter. I believe it not only converts but steps down the voltage from 110 to whatever voltage it needs to be.

Does it look like what I think i see? That they look rusted / burnt out on the edges there? I've not seen one of these before to speak to if that is right.. feels like they probably just fried:

https://www.dropbox.com/s/pnyeyph4ri7us ... 7.JPG?dl=0

https://www.dropbox.com/s/sta1zdr6gag7m ... 8.JPG?dl=0



Also while I'm in there, I wanted to replace those capacitors as well and wondered if anyone would have advice on them. This is probably more straight forward reading the values on the caps, but I still wanted to see if anyone had advice / insight on them.

https://www.dropbox.com/s/nhirlell0ye3z ... 1.JPG?dl=0

Any insight into this would be much appreciated. I'd like to find the exact part, but I do have the service manual which seems reasonably informative, but not 100% sure what output it needs to be. I know these inverters are still around (is it an inverter?) but i need to insure i get one (even if it's not identical in shape) that at least steps down to the expected DC voltage output.

I'm in the middle of a song using this thing so I'm super excited to bring it back!

Thanks!
Caleb

Re: Kawai K3m - missing rare part. does anyone make custom pieces? (Update)

Posted: Wed Oct 02, 2019 9:54 pm
by part12studios
So i've been diving around today and thanks to the fine chat folks at NTE, this appears to be a modern equivalent. So I'm going to order these and see about that. Will update the progress of this

https://www.ntepartsdirect.com/ENG/PRODUCT/NTE5304

Re: Kawai K3m - missing rare part. does anyone make custom pieces? (Update)

Posted: Wed Oct 02, 2019 11:32 pm
by rhino
They are rectifiers. They do turn AC into DC. You may have to do alot of digging in vintage part suppliers to find that shape (4 leads inline). With care, you can substitute modern 2x2 lead (square) ones. The stuff on the spaceers is glue to hold against any vibrations. Best of luck. Let us know how you're doing.

Re: Kawai K3m - missing rare part. does anyone make custom pieces? (Update)

Posted: Wed Oct 02, 2019 11:40 pm
by rhino

Re: Kawai K3m - missing rare part. does anyone make custom pieces? (Update)

Posted: Thu Oct 03, 2019 2:06 pm
by part12studios
Awesome yea pins seem to be reversed on the inline ones that i've found. However with a little careful effort i would imagine it isn't too hard to bend wires around in such a way to go to the correct pins.

I did (thanks to one of the parts suppliers out there) get this page which will be very interesting to future folks who might need this part replaced on their aging devices:

https://www.sansui-vintage.com/product_ ... cts_id=147

this shows a chart that clearly indicates the values and model numbers. Very good stuff! Thanks for the input as well and research. I ordered 4 of those 2x2 ones linked above.

I'm also looking to replace the caps as well since they are certainly likely to go bad at some point as well if they are not already part of the power up problem. These look promising. They are the right rating which is the most important part, but i think they are also close in size.

https://www.ebay.com/itm/4700uf-mfd-Ele ... 2749.l2649

Once parts arrive and I go to my local repair guy, I'll report back how things go.

Thanks!
Caleb