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Beocenter 1800 - transformer runs very hot

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Almiscarado
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Almiscarado posted on Wed, Dec 23 2020 11:12 PM

Hi there!

 

I just received a Beoventer 1800 bought "un-tested" and started "testing" it :) Like most untested items, it needs repairs.

Plugged it, FM runs fine but I started smelling like something is burning after 30 seconds, so I turned it of. Took the top off and noticed the transformer was very very hot (hard to touch after only about 30 seconds running).

The smell also seems to come from that area. I am afraid of keeping it on further time because something might catch fire, but my question is:

 

How hot can a transformer run on these old receivers? What could I try to check first?

 

All help is welcome, many thanks!

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Dillen
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Dillen replied on Thu, Dec 24 2020 6:59 AM

Check the idle current settings.
But only power up very briefly! Only just enough to take one reading at a time.

Martin

Almiscarado
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I noticed this:

 

 

Could the transformer be physically damaged?

 

Almiscarado
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I still do not have the service manual, where could I test voltages?

I really would.love to repair this amp...

Dillen
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Dillen replied on Thu, Dec 24 2020 11:02 AM

Yes, that transformer needs replacing.
Perhaps the record deck stood on it. It can happen if you're not careful when (dis-)mounting it.

Don't power the Beocenter up again before it has been replaced.

Martin

Almiscarado
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I do not know if it got loose on the delivery, but the transformer had lost the bolts that hold it to the chassis and came running on the record deck.

Now I really do not know where will I find a replacement :( not many B&O here in Portugal...

Almiscarado
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I do not know if it got loose on the delivery, but the transformer had lost the bolts that hold it to the chassis and came rubbing on the record deck.

Now I really do not know where will I find a replacement :( not many B&O here in Portugal...

Dillen
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Dillen replied on Thu, Dec 24 2020 1:02 PM

Beoparts is always a good place to ask for parts for vintage B&O audio products. Whistle
I'm sure I can find one in the dungeons.

Martin

Almiscarado
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Ok.. I would be pretty much interested!!!

Almiscarado
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Ok.. I would be pretty much interested!!!

Dillen
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Dillen replied on Tue, Dec 29 2020 11:48 AM

Found this:

You have PM.

Martin

Almiscarado
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Perfect! :) Lets see If I can fix this wonderful B&O

tleskinen
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Funny thing - I just had a restoration project of a BC1800 and it had the bolts missing too.I believe that's because it's so hard to figure out how to open the unit if you don't have the service manual. Someone had obviously been messing around there before me and removed every screw, hoping that would help to open it :)

Luckily, the transformer was not damaged in the delivery, only small scratch marks on that same spot.

Almiscarado
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Got the new transformer installed and it cured all problems!

 

Now for the next problem: the turntable motor was stuck, I removed it, opened up and cleaned / oiled all moving parts.

Re-assembled it and now it works and spins, but.... slightly slow! :(

If I let it playing for 30 minutes or so it gets up to regular speed, so... what could the problem be? The oil I used would be too thick? Ae any other problematic parts? This is the AC version so I do not see much to adjust besides the motor itself...

 

Any help would be very helpfull!

Almiscarado
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Got the new transformer installed and it cured all problems!

 

Now for the next problem: the turntable motor was stuck, I removed it, opened up and cleaned / oiled all moving parts.

Re-assembled it and now it works and spins, but.... slightly slow! :(

If I let it playing for 30 minutes or so it gets up to regular speed, so... what could the problem be? The oil I used would be too thick? Ae any other problematic parts? This is the AC version so I do not see much to adjust besides the motor itself...

 

Any help would be very helpfull!

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