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Help me fault-find a Beocentre 2002

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SamWise72
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SamWise72 posted on Mon, Mar 12 2012 8:33 AM

You may remember my thread on the old forum asking about learning basic electronic skills; well, I think my opportunity is here. I've got a soldering kit with both a gun and a low watt iron, some decent insulated tools, and I'm waiting for my meter to arrive. I've also acquired a Beocentre 2002 with a couple of issues.

Now, before you tell me, I know this is not a particularly worthy product, and that's exactly why I want to try working on it. I got it for £16, which was very cheap just for the good condition S30s and the work MMC20S, so I feel like the unit itself was as good as free, and since it's not much loved by anyone, it doesn't matter if I risk working on it. So, the issues are that the left hand side speaker channels don't work; the seller thought it was just dry joints in the outputs, but I know enough about how things work to realise that could be wishful thinking. Can someone who knows their onions talk me through faultfinding this? I need to know the steps, but also why you'd take those steps, as I want to learn the necessary thought processes. The tape deck also doesn't work (sellers thinks it just needs a belt), but I'll think about that after I've done the speaker channels.

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tournedos
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It may not be the optimal way to start because I don't think the schematics are anywhere to be found (not on this site, anyway), and I don't think you'll find many others who have even bothered to open one up.

But as you said, there's not much to lose, so take it as an adventure Smile

You may well be right about the seller's diagnosis; I believe it is far more likely to be a blown power amp instead of a contact problem. I would assume the center uses some Japanese hybrid modules in the power amps, but let's not get ahead of things... you'll probably need to show us some pictures.

For the cassette, the belts are the most likely fault, but you're right again, there's not much sense in fixing that until the amplifier works.

--mika

SamWise72
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Absolutely; remove the MMC20S and the speakers, and even fully working, it could be that nobody would buy it! Essentially it's a tinker-toy. I'm going to be away for a few days, then I'm going to brace myself and start taking it to pieces.

Dillen
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Dillen replied on Wed, Mar 14 2012 10:26 AM

is it on all sources (FM/Tape/Phono) ?

If so, it could be a capacitor problem or, more likely, an amplfifier fault.
The amplifier module comes out the back.
Take it out and check the fuses on the board.
If the fuses are not on the ampl. board, they are on a separate board nearby.

If a fuse keeps blowing, replace the hybrid chip in that channel.

Is the problem only on FM, check the MPX filters. They tend to lose internal connection in these Beocenters. 

Beocenters 2000 and 2002 are getting scarce fast.

Martin

SamWise72
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Thanks Dillen

According to the seller, the problem is on everything (certainly it occured with the record deck), so I'll start with the amp fuses.

SamWise72
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When you say they're getting scarce, does anybody WANT them? I'm imagining I might fix this up and give it to a friend. It might not be real B&O, but it's a cool looking unit, and sounds pretty decent on the channel that's working.

Dillen
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Dillen replied on Thu, Mar 15 2012 12:55 PM

Do people want them ?
That depends on their needs.
If you never play records or cassettetapes, it's a huge and impractical unit. A nightmare to dust and clean.
If you do, however, it's a quite typical 1980's combo unit with a greater retro effect than most B&O
and the sound quality, if given a pair of decent speakers, is not THAT bad.

Some people actually like them a lot. My sister used one for many years and loved it.
I've had several in for service over the years and there are still some in daily use.
A serious B&O collector would also be interested.

Martin

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