Welcome and thanks for joining as a silver member, it is greatly appreciated! 🤒

The type 2333 is mentioned in the service manual for Beomaster 5500 we have on site - it is not complete, but the schematics are there.

Unfortunately it seems like the US type 2333 is only prepared for 120V operation, and the transformer doesn't have the alternative primary windings that European models have. Therefore your only options are using an external step-down transformer 230V -> 120V or replacing the transformer completely with a spare from a Euro spec model.

No problem... i will show a picture for the modification.

Martin

@Mika: thank your for the welcome. The silver membership came with my interest in the service manuals 😕 But that's alright, since those manuals can save you a lot more than the (very fair) cost of the membership. And it's a great forum, after all.

I missed the 2333 in the aforementioned manual the first time, but having another look, it's all there on page 2... 👍 And from what I see (I don't have that much expertise in circuitry diagrams, though) I think the 2333 IS able to work on 230V. At least, the diagram shows wiring with 2x60V (=120V, US mains) and 2x110V with additional (?) 2x10V which I guess sums up to 240V (which would represent the European upper voltage boundary of 240V). Additionally, there's a wire which has 50Hz/60Hz written next to it. But apart from seeing this now, I don't really know how to apply that to the circuit board...

@Martin: So, that's the part where I really need your help I guess 😐 In fact, I was happy to see you reply to my thread. You could explain it in German, but I think it would be more useful to others with similar problems in the Beomaster 5xxx-range. Vielen Dank schon mal 🙂

[quote user="beomaster224"]I missed the 2333 in the aforementioned manual the first time, but having another look, it's all there on page 2... And from what I see (I don't have that much expertise in circuitry diagrams, though) I think the 2333 IS able to work on 230V. At least, the diagram shows wiring with 2x60V (=120V, US mains) and 2x110V with additional (?) 2x10V which I guess sums up to 240V (which would represent the European upper voltage boundary of 240V).[/quote]

Yes, but the way I interpret it, the schematics on the primary side just show two alternates, and don't mean every transformer has both of them. Also, I only see four solder lugs on the primary side of the transformer in your pic and so I believe it only has two non-tapped windings, not four (nor six, if all the alternatives were available).

The more complete BM6500 service manual shows the transformer wirings, and the Euro models apparently can be rewired for 220/240/110/130V, while the US 120V model is fixed to one voltage only and so is the 100V model (Japan, I guess). They have different part numbers for the transformer as well.

But I'm only working from the schematic and Martin has seen a lot more of these, so I'm not going to argue with him - if it is possible, then great 🙂

***

I believe the microcomputer uses the "50/60 Hz" line for timekeeping, but it apparently autodetects the frequency, so that shouldn't be a problem.