Beocenter 3500 (Beogram 3000 type 5228) damaged in transit - where do these parts go?

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rabidlistener Posted: Wed, Jul 10 2013 6:50 AM

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Hi there

as per my pervious thread I acquired a Beocenter 3500 but it became damaged in transit and I needed help getting it apart.

With the help of your wonderful instructions I have been able to get into the unit and work out what has broken.

The most obvious damage was the broken selector dial. As I ascertained how to repair this item a couple of interesting facts became apparent - the selector dial had been broken before (traces of previous attempts at glueing it back together) and this component does not appear in parts diagram/list in service manual!! Anyway I have managed to glue it back together and it appears to be working.

When I seperated the TT from the receiever a couple of parts dropped out!!

One is a long thin piece of piano wire which is called an arm in the service manuals. (Beocenter 3500 part #249 or Beogram 3000 part #49) I have no idea what this item does or where it goes!!

Secondly a little tiny ball bearing was floating around in the unit.  Looking at the Beocenter 3500 service manual this could be part #363 as I can see no other bearings in the parts list. Could this bearing fall out and is it possible to repair it?

Many thanks in advance for your help

Mike

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rabidlistener replied on Tue, Jul 16 2013 5:21 AM

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As I got no reply to these questions I  decided to bite the bullet and re-assemble the Beocenter without these parts and see what happens.

Well I switched the thing on and did not get a blinding blue flash, grinding noises and any smoke so I must have done something right!

I can get the TT to spin at both 33 and 45 but the arm with only travel to the 7" single position.

Any suggestions?

Regards

Mike

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Søren Mexico replied on Tue, Jul 16 2013 5:40 AM

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The piano wire is part of the record size selector mechanism, the ball is from the tonearm shaft bearing, there should be 2 more balls in there

Look here check the whole thread until you find the pics a description

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rabidlistener replied on Tue, Jul 16 2013 6:11 AM

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Hi Saren

Many thanks for your reply.

I could not see the piano wire in your pictures. Where does this actually connect to?

Looking at your thread it appears refitting the ball bearing could be an epic bigger than Ben-Hur!! I may pluck up the courage an attempt the repair some time. Failling this I may decide to remove the B & O arm completely and fit a Rega one if I can get enough clearence. I shall have to make some measurements. It could be interesting!!

Regards

Mike

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Søren Mexico replied on Tue, Jul 16 2013 6:37 AM

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Without 3 balls in the shaft bearing, the anti skating will not work, there are 2 piano wires in the deck as far as I remember, one from the speed selector to an arm sitting under the flywheel, and from there about to the tonearm shaft, check the pics

Lower right corner blue arrow, upper left corner blue arrow

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Søren Mexico replied on Tue, Jul 16 2013 6:54 AM

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The piano wire from the speed selector will be the one thats loose, the other one is there as the tonearm moves.

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rabidlistener replied on Tue, Jul 16 2013 7:08 AM

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Have managed to attach one end of the wire at the selctor dial but cannot work out where the other end goes. Looking at your picture it disappears underneath the inner platter. If you look at the gray metal casting, between your 2 green arrows there are the disc sizes embossed into mthe metal plus a little lever - I presume the other end of the piano wire goes there somewhere. The inner platter covers this area and I cannot see where to connect the wire. How do you remove the inner platter?

Regards

Mike

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Søren Mexico replied on Tue, Jul 16 2013 7:18 AM

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Check my thread, I dont remember right now , but I think I somehow managed to do it without moving the inner platter, the piano wire moves a lever that commands the tonearm movement, the 2 set down points are adjusted around there too

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Dillen replied on Tue, Jul 16 2013 7:23 AM

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Wow, live real time global workshop technical guidance.
On Beoworld, of course.
Where else would you find it ? 

Martin

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Søren Mexico replied on Tue, Jul 16 2013 7:30 AM

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That is what we do here

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Søren Mexico replied on Tue, Jul 16 2013 7:37 AM

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There is a white point over the W in SWINGING Chassis, somewhere there, it should be possible if you fumble a little, I had the swinging chassis out, the piano wire fell out during assemply, so I had to get it in with the swinging chassis in place

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rabidlistener replied on Tue, Jul 16 2013 12:21 PM

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Eureka!!

I have had a partial win. Upon further investigation I have found where the piano wire connects. The lever was turned round so I could not see the hole to attach the wire!! My only problem now is it appears one end has broken off the piano wire and it will not fit - bummer. Tomorrow I shall attempt to buy the correct gauge wire and make a new one. Could you tell me if possible does the wire connect to the selector dial underneath or on top? I cannot make it out from you photos.

Once I have got this sorted out I may pluck up the courage and attempt to repair the arm.

I really appreciate your help - many thanks

Regards

Mike

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rabidlistener replied on Thu, Jul 18 2013 5:19 AM

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I have finally had a win with this device. I bought some piano wire from a local hobby shop and made up a new version of the rod. After several futile attempts at fitting the bloody thing with much nashing of teeth and the air blue I had had enough. I was just about to give up with whole mess when I had a flash of inspiration - if I forget about the rod entirely, keep the lever in the correct position (I used nail varnish) I could fool the automatics into playing 12" singles at the correct speed of 45rpm.. Seeing as I am never likely to own any 7" singles this is a good thing for my application.

At least this has given me hope and I shall have a go repairing the arm next week.

Regards

Mike