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Beogram 8000 Project

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sonavor
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I have been wanting to work a Beogram 8000 restoration project for over two years now but kept getting derailed by other things. Now that I have several Beogram 8002 projects under my belt and a few Beogram 400x projects finished, it is time to get at least one Beogram 8000 turntable working in my home.

Two of my Beogram 8000 turntable candidates were from system purchases I made over the last two years. A third turntable is one I found for a good price on Ebay.

All three BG8000 turntables were acquired in non-working condition. I also collected some of the Beogram service and technical manuals so I think I am ready to start.


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sonavor
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I had to order a few 2200uF, 16V and 4.7uF, 100V capacitors as well as some 40 pin DIP sockets (to replace the old ones for the microprocessor). Everything else I had plenty of stock so I am ready to start working on the first Beogram.  I think I will restore the newest serial number turntable first as it has all of the factory integrated modifications.

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sonavor
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The three Beogram 8000 units are in various states of disassembly. My goal is to get at least one functioning and ideally, all three.  However one of the turntables came with broken tonearm wires.  I used that tonearm to learn how to remove the cartridge mount in my Beogram 400x thread (using Martin's boiling water technique).  Since that repair will be the most difficult it moves it to the end of the line.  I will pick one of the candidates that has the most chance of success to be first. 

Here are some of the parts removed from the three Beograms.  All three also have bad tacho discs.  I have one of Martin's metal tacho disc replacements so I will order additional discs if the chance of repairing more than one turntable is possible.


sonavor
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Here is one of the Beogram tach discs that is actually in decent shape. It is starting to peel though so it needs a metal disc replacement.


sonavor
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This Beogram 8000 tacho disc is really shot.


sonavor
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I noticed that two of my Beogram 8000 turntables are fairly close in serial numbers and have the same kind of tach sensor.


sonavor
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The third Beogram 8000 is a later serial number and has a slightly different tach sensor assembly.


sonavor
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My next step is to decide which of the turntables with good tonearm assemblies I'll start with and I need to go through the circuit boards to see if I have all of the replacement capacitors in stock. Hopefully I can start working on the first Beogram this week. 

-sonavor

Jason
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I'm looking forward to this thread, I can't get enough of the 8000 series 👍

while your in there check the condition of the 3 optos , 1 under the tone arm and the 2 inside the keypad, one of my machines the silver coating had faded so measured working but were no longer doing thier job well enough and adjustments couldn't compensate .

replacing all 3 worked wonders.

Regards Jason 

sonavor
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Jason :

while your in there check the condition of the 3 optos , 1 under the tone arm and the 2 inside the keypad, one of my machines the silver coating had faded so measured working but were no longer doing thier job well enough and adjustments couldn't compensate .

replacing all 3 worked wonders.

Regards Jason 

You are referring to the photo resistors 5R1 (for the tonearm) and R9, R10 (for the keypad)?  Where did you get your replacements?

 

 

Jason
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Yes the photo risistors, the ones I used were just what I had in stock at the time, smaller than the original but worked perfectly.

bought from cpc , code re04698

regards Jason 

Jason
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I don't know if I was just lucky but once installed I didn't need to do a single adjustment on the screws, perfect function was just instantly restored 

jason

sonavor
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One of my Beogram 8002 turntables has a problem with those adjustments. It is the only one I have had an issue with regarding those but I never inspected those photo resistors.  It sounds like they are probably the root of the problem on that one. I will definitely check them on these Beogram 8000 units.

Thanks for the information.

sonavor
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Looking over the Beogram circuit boards there are also two almost identical and one different.
The main differences are on the microcomputer board.  This picture shows the microcomputer board on the left not having the modification for turntable speed variation that the microcomputer board on the right has.  Two of my boards are like the one on the right.


sonavor
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One of my service manuals contained an addendum page describing the modification.


sonavor
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So what I have are two earlier Beogram 8000 turntables.  One of them has modifications per the service manual addendum.  Then I have the newer Beogram 8000 turntable that has the changes as they were incorporated in the production line.

Here is the trace side of the oldest main board next to the later main board.


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