Electronics > Repair

Microwave oven - What kind of DC/DC Converter am I looking at?

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JannB:
Dear community,

roughly one year ago I tore down an old microwave oven.
Sadly I did not make any pictures of the whole oven (e. g. the type plate).

The part of interest is a DC/DC converter populated on one of the PCBs I salvaged for later use.
The information I have are the following:

Typ / Art.-Nr.: ETXMJ197X1BG
Input: ~ 325 Vdc
Output: DC 12 V and DC 30 V

What I want to know
#1: Manufacturer
#2: Dataseheet (Rated power, line regulation, load regulation, etc.)
#3: Price / Value

I attached serveral pictures as well as the service manual for a similar microwave oven.
The part of interest is referred with IC10.
Unfortunatele the schematics are not searchable so you have to manually scroll to page 28 / chapter 19 to find the converter at the top middle.

I tried to find this part at serveral venders without success.
On mouser.com I get mostly open frame ones like:
RECOM Power
RACM30-12DK/277/OF

fzabkar:
Manufacturer is Matsushita / Panasonic.

https://www.partmaster.co.uk/images/mediator/121/av359wb.pdf (page 28)

https://fcgresources.blob.core.windows.net/fcgpdfs/ED/00230.pdf (page 28)

https://www.sm.azhand.co/ServiceManuals/KA/Microwave/NN-C784M(PTE).pdf (page 33)

https://www.sm.azhand.co/ServiceManuals/KA/Microwave/NN-C784MF%28TTE%29.pdf (page 31)

https://www.commentreparer.com/doc/34435/panasonic-nn-l750wb-nn-l760wb-pdf.pdf (page 92)

Ranayna:
I can at least help with the Manufacturer Logo:
https://logowik.com/matsushita-logo-vector-36730.html

That distinct M stand for Matsushita.

Googling Matsushita ETXMJ197X1BG returns a couple of service manuals like this one, listing the component:
https://www.manualslib.com/manual/2800853/Matsushita-Electric-Nn-V688w.html#manual

So it's a custom part made internally, there will very likely be no public specs available.

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