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Author Topic: Getting inside a Neumann NKM 1649 p/s  (Read 220 times)

everettmoran

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Getting inside a Neumann NKM 1649 p/s
« on: February 02, 2020, 04:44:39 pm »

I need to get inside the above captioned power supply to reseat the output connector to the KM54, but cannot for the life of me figure out how to open the thing. It looks like the metal cover should pull straight up once the screws are removed, but the cover has not loosened at all. Does anyone have experience with this particular supply? Klaus?
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klaus

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Re: Getting inside a Neumann NKM 1649 p/s
« Reply #1 on: February 02, 2020, 08:14:43 pm »

When an older power supply had not been opened in years/decades, it sometimes takes more than just removal of the four screws.

Turn the unit upside down, insert a thin screwdriver into the gap formed between cover and base and, going around the two seems, carefully crack any seal formed by dirt or possibly leaky Stabilyt/NiCad cells.

You cannot break the gap open, as there are four lips welded to the inside of the cover that clamp down on the base of the unit, which keep the cover flush with the base. But you can move the cover slightly up by going around the perimeter of the base plate with the screwdriver and slightly leveraging the edge of the cover upwards. Then yank on the handle to lift off the cover. That should do it.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

everettmoran

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Re: Getting inside a Neumann NKM 1649 p/s
« Reply #2 on: February 07, 2020, 03:29:00 pm »

That worked. Thanks. What holds the female 6 pin connector to the chassis? Also, do you have a source for a schematic for this power supply, as well as the pin out configuration?

Everett
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klaus

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Re: Getting inside a Neumann NKM 1649 p/s
« Reply #3 on: February 07, 2020, 06:34:46 pm »

A knurled, threaded ring nut tightens the connector to the p.s.'s wall. from the inside. It is usually sealed with lacquer to prevent loosening.

The proper schematic will probably be uploaded by Uwe. If not, I'll dig one up eventually. Make sure to specify whether your NKM still has Stabilyt cells or the solid-state regulation fo the heater voltage.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com
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