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Beomaster 8000 Project

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sonavor
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sonavor posted on Tue, Aug 6 2013 8:28 AM

Here is the Beomaster 8000 that I acquired as part of an 8000 system earlier this year. I have been wanting to get this receiver working again but kept getting side-tracked. I think it is now time to dive into it. I have the service manual so I think I am set.

 

 


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Menahem Yachad
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Well done!

Time will come when you will want to learn about calibrating the radio section in all these machines. 

Very fulfilling and satisfying work, on its own merits :-)

chartz
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chartz replied on Fri, Dec 5 2014 12:45 PM

Menahem Yachad:

Well done!

Time will come when you will want to learn about calibrating the radio section in all these machines. 

Very fulfilling and satisfying work, on its own merits :-)

I do appreciate your compliment Menahem. It is I guess more the lack of proper tools to do the job than the sheer will to do it!

The other day I was talking to an old tech guy, not quite retired yet...

I did ask about his equipment, if he was contemplating to let it go, but got a vague answer. We'll see.

Leslie hasn't been on the forum lately. Has anyone else got a spare donor unit?

 

Jacques

chartz
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chartz replied on Sat, Dec 6 2014 10:31 AM

It did happen by the way Whistle

Jacques

chartz
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chartz replied on Mon, Dec 8 2014 12:52 PM

Now I'm on the verge of ordering some 60 SMC LEDs (LUMEX SML-LX0603IW-TR - they are cheap at 0.3€ each) and some soldering paste. I've got a hot air gun, so I will use that method.

An idea I've been playing with is to glue the minuscule components with cyano so that they are perfectly centered, and also to prevent them from moving under the pressure of the air flow. Idea

If this operation is a success, I will be able to repair the mint Beomasters with defective displays. I could have had it done of course, but I would have missed all the fun Smile

 

Jacques

sonavor
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I thought you said this Beomaster was "a rather tatty example".  It looks pretty good in the picture you posted.  One of my spares has some bent heat sink fins. A previous owner must have dropped it.

chartz
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sonavor:

I thought you said this Beomaster was "a rather tatty example".  It looks pretty good in the picture you posted.  One of my spares has some bent heat sink fins. A previous owner must have dropped it.

Make no mistake, it IS tatty. It was stocked on a concrete floor, on its left side; so the whole left is scratched. The fins were bent too, but that's fixable.

A repair attempt was made at some point, but it was abandoned. It was not even re-assembled correctly, and the solders were absolutely hideous.

There are many chips to the wood trims too, and one on the glass panel. 

Now this was given to me, and I took it because I knew that the processor was good. So it was mainly seen as an organ donor, nothing more.

BUT I couldn't resist fixing the poor thing - which still looks so-so - but which works absolutely fine, as well as my mint one! 

The display repair is yet another challenge for me to tackle. Smile and John and Rudy are there for me! Thank you!

Jacques

sonavor
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I haven't had to try one yet but I'll bet the wood trim on these series of B&O components could be replaced with some new Rosewood veneer pretty easily.

sonavor
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I came across another Beomaster 8000 unit with the undocumented auxiliary connector. So I will post the question again asking if anyone knows what this connector was for and what the history is behind it?

The Beomaster 8000 cabinet already has a place for this optional connector but I have not found any documentation about it in either the user manual or service manual. 

All of the units that have the connector (I have run into four now) look like the connector was added after the Beomaster left the factory. A splice is performed on the Preamp PCB P17 connector to get -15 VDC and Ground for the auxiliary connector.

Here is the auxiliary connector from the inside and the outside of the Beomaster 8000.

Did some units come from the factory with the connector or was it something that was in the original design, then scrapped...then added back in as a mod?

 

Guy
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Guy replied on Sun, Dec 31 2017 8:12 PM

According to this link there was a kit that made it possible to use the Beo4 with a BM8000.  Perhaps the connection is for that.

http://www.lintronic.dk/feedback.aspx

sonavor
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sonavor replied on Sun, Dec 31 2017 10:45 PM

Thanks for the information. The Beo4 came about much later than the Beomaster 8000 so I don't think the port was intended for that purpose although it could have been made to do so. After talking to some other Beomaster 8000 owners I am leaning towards the port being using as a on/off trigger to some other component that users wanted to use with their Beosystem 8000. The Beomaster remote could then switch everything on and off. 

Hopefully an owner that used the functionality will find this post and supply a definitive answer.

Premiumverum
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Hi Sonavor,

I think the seldom seen 'code converter' runs on a negative voltage. possibly this is what the connector is for? Handmade as a service by a tech savvy B&O dealer?

The code converter, as mentioned on http://archivedforum.beoworld.org/forums/t/14788.aspx, for using a BL1000 with 80's B&O systems.

Mine came with an aftermarket 9V adapter which has + on the ring and - on the tip. This -15V connector will probably do as well.

sonavor
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Thanks for the links and information Premiumverum.

From the information you referenced it makes sense that is what the -15V power connector is for. Unfortunately none of the image links on the old forum site work anymore. However, the link to the Master Control Link manual still works. 

So it sounds like the Beomaster 8000 provides switched power to this remote control IR converter box that allows a newer B&O remote control to work with the Beomaster 8000. The -15V power from the Beomaster 8000 was just a convenience over using a separate power transformer (wall wart) for the converter box. 

-sonavor

sonavor
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Updated my Beosystem 8000

This year I updated the 7 segment displays on my Beocord 9000 and Beomaster 8000 inbetween projects for other Beosystem 8000 owners. In addition I changed out the artwork I had on the wall with my Beosystem.  I kind of like the new look.  The 1980 Bang & Olufsen design still goes great with art from 2019.

I like it ... except for one stray speaker wire I should have tucked away in the SC80 cabinet.

-sonavor

Saint Beogrowler
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sonavor:

Updated my Beosystem 8000 This year I updated the 7 segment displays on my Beocord 9000 and Beomaster 8000 inbetween projects for other Beosystem 8000 owners. In addition I changed out the artwork I had on the wall with my Beosystem. I kind of like the new look. The 1980 Bang & Olufsen design still goes great with art from 2019.

I like it ... except for one stray speaker wire I should have tucked away in the SC80 cabinet.

-sonavor

I love it!
Dennis
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Dennis replied on Sun, Mar 17 2019 12:42 PM

Looks great! If you had asked me when the art was from, I would have guessed the 1980s! 

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