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-   -   Beomaster 1900-2 restoration - manual? (http://www.diyaudio.com/forums/solid-state/26155-beomaster-1900-2-restoration-manual.html)

mb 16th January 2004 12:30 AM

Beomaster 1900-2 restoration - manual?
 
Hi,

Does anyone have the service manual to this B&O receiver, or know how I can purchase one? I've checked with most sites offering manuals for sale, and can't find one for this model.

No manual = money down the drain. I bought a lemon; I'm trying to a least get it back to life...

Thanks.

mrfeedback 16th January 2004 02:19 AM

What's wrong with it, and can you post pics?

Eric.

mb 16th January 2004 05:29 AM

It's old, tired and when I bought it, there was an obvious hum. Shortly after, the touch senstive select would not work (ie. no power up). Thereafter, it blew an output transistor when my friend tried to check it out. Still, it looks beautiful, and to get it up and running would be great.

The previous owner obviously sent it to an incompetent for some repair.

At worst case, I was thinking of replacing he entire innards with a gainclone, but that would be such a pity.

http://www.jacob-jensen-design.dk/en...ster1900-b.jpg

mrfeedback 16th January 2004 05:41 AM

Sounds like you have a regulator fault in addition to the blown output transistor.
You could remove the output transistors for that channel and investigate that all pre-amp/digital supplies are up and getting to the approprite sub-boards.
Once you have done this and confirmed overall operation you could then rebuild the faulty output channel.
Put a 40W or 60W lamp in series with your 240V power whilst doing this investigation.

Eric.

JensRasmussen 16th January 2004 10:09 AM

Manual
 
Hi,

I'll see what manuals I can find at work....

Are PDF's ok?

\Jens

kevin gilmore 16th January 2004 09:37 PM

I have a 2400 which is basically the same thing except more
power. Had schematics somewhere, don't even know where
to look. B&O should be willing to sell you them however.
After you get it working again you will still have a low quality
item. The balance, bass and treble sliders get very noisy
and you will NOT be able to find replacements for them.
Much of the time one or both channels on mine cut out due
to the balance slider. B&O is gorgeous to look at, but poor
designs. Crammed into a box with virtually no room to work.

Cybergent 16th January 2004 10:06 PM

Quote:

Originally posted by mb
At worst case, I was thinking of replacing he entire innards with a gainclone, but that would be such a pity.
I donīt think so.

B&O has some special optical design, that some people really like.
But from the technical point of view it is really nothing special.
A good replacement would seriously improve sound quality here.

mrfeedback 17th January 2004 02:58 AM

Learning Curve.........
 
Whilst I would not rate these B&O systems as high-end, for general home/family usage these work very well, the remote controls are second to none and the WAF is pretty much ultimate.

The initial hum may have been caused by a dead cap, and it sounds like your friend slipped a meter probe or something and blew an output stage.
You (and your helpful friend!) could isolate power from the output stages and then find the fault causing no power up.
There are multiple fuses in these, so that may be part of the problem.

Once you have it powering up you could connect tape outs to an external amplifier to confirm pre-amp operation.
Once power up/pre-amp operation is confirmed it should not be too hard to rebuild the output stage.
Like I said these are not fantastic hi-fi, but they do have a sound quality different to anything Japanese, and they are nice to live with.

Good luck, Eric.

mb 23rd January 2004 07:19 AM

Thanks for your comments and suggestions.

Jens & Kevin, any luck locating the manuals? PDF will be just fine. Send me a PM, and I'll reply. I'm quite aware that the ultimate quality of a repaired BeoMaster won't come close to my AKSA or gainclone, but I thought that it would be an interesting exercise. If this search for the manual really needs to nothing, I'm ready to look at re-using the fairly hefty toroidal transformer as a basis for a Jacob Jensen GC!

Thanks,
mb

NinaK 31st July 2005 09:11 AM

Manuals for 1900
 
I have one for Beomaster 1900 type 2903, though I'm not sure if it's complete. But I can send it to you, so you can see for yourself.


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