Beogram 8002 processor

I have a processor for a Beogram 8002 that only does this:

It is the right part

And I’ve tried it in 2 other working beogram 8002s that both work perfectly with other processors. I’ve also tried a known good processor in the same housing and it all works as it should.

Is this something that can be “reset” or is this dead?

It came from a processor housing that had some serious trace damage from a previous “repairman” replacing the pin socket and the main board was partly damaged from burns and lifted traces from their attempt at recapping. I’m skeptical if it was handled in an ESD safe environment before me.

They are mask programmed. You cannot "reset" a dead processor.
They rarely fail - but of course it can die if handled badly during service (lack of ESD-protedtion), if it experienced an
overvoltage, was fitted the wrong way around or similar.

Martin 

Thank you Martin.

It’s painful to see an entire table that has become unusable because of someone’s carelessness. I guess this puts me in the group of people who have an extra BG8002 that is now fully repaired but needs a processor.

Just have to be patient and wait for one to show up on Ebay. Occasionally someone is parting out a damaged unit where you can grab the microcomputer assembly. I have acquired a few that way. If I spot one I will try and remember to message you.

sonavor:

Just have to be patient and wait for one to show up on Ebay. Occasionally someone is parting out a damaged unit where you can grab the microcomputer assembly. I have acquired a few that way. If I spot one I will try and remember to message you.

Thank you. There is the processor from a BG8000 for sale in the UK right now I was tempted by, but I will wait and do it the correct way.

The Beogram 8000 and Beogram 8002 processors are not the same so yes, please save your money and wait for the correct one.

The wait was not as long as I anticipated:

That's the right one for the Beogram 8002. Brand new in the box (NOS)? Where did you find it?

sonavor:

That's the right one for the Beogram 8002. Brand new in the box (NOS)? Where did you find it?

Funny story!

It looks like used old stock but works fantastically! Solder on a few leads and dried heat paste on top. I didn’t think that BG8002 ever had the processor soldered in so I don’t know the story behind this.

A couple years ago when a B&O repair guy had his stuff sold off by an estate group I bought a large “parts lot” for a tonearm for my BG5000 just for fun. Mostly junk and broken bits. I was looking for a replacement rubber donut that holds the main PCB in place that I thought I remembered seeing a few of in the box. Having typed “8340454” many times over the weekend, I about jumped when I saw this, here in my closet.

On a side note, this particular beogram 8002 is probably the grossest project I’ve done. A moderately sized ball of dead worms under the subplatter, hair wrapped all around the threaded spindle rod, and what looks old frying grease all over the outside. And old mouse droppings under the tonearm. The moving chassis was sitting on top of a “play” button for a control panel as well. Someone’s project that didn’t go well.

On Beogram 800x restorations I completely strip everything down...never found any worms though. I have run across some insect remnants :-).  I think I bought some of those parts from that estate sale as well. It was someone in Illinois, right?

I have never seen a microcomputer for any of these Beogram 800x turntables soldered. They always had an IC socket. I would recommend getting a good, tulip-pin style socket and install that. Martin gave me a good tip a while back regarding not installing the new IC socket all the way flush with the board. By doing that you can insure that the thermal paste will make good contact with the microcomputer IC and the metal lid of the shielding box. There are also some small resistors underneath the microcomputer IC so it would be best to use a socket for that reason too. 

 

 

That’s probably the same estate. Lots of good stuff in Illinois.

 

The first BG8000 I bought had the processor soldered in. I desoldered it a couple pins at a time because I was so paranoid about over heating it. But that table was also someone’s failed project so it might not have started that way. I bought new pin connectors in bulk at that time so I always replace them too. I have been mounting the pin connectors as high as I could because I didn’t want to mess with the cooling contact with the housing.

 

This is my 6th 800x, they get so much easier each time. Your work is an inspiration!