[Xavier]

That’s nice. They positively surprise me again 🙂

I installed the antenna, but there is still something wrong with FM radio – I hear a low humming voice in the background, like on AM radio, and tuning is poor.

I saw radio voltage calibration in the service manual. Is this the right direction?

[Xavier]

Thanks Mark!

The radio previously worked on a piece of cable. That’s why I think it’s enough if I order a small telescopic antenna, as on the picture. What do You think?

The cassette player also worked, similar to the display. I’ll start with the diagnostics of the player mechanics.

But before that I will listen to music from vinyl. I am happy as a child : )

X

[Xavier]

Hello!

I moved forward with the subject.

Beocenter works. During two hours, he did not turn off even once.

The turntable plays nicely.

The radio works and tunes, but it makes a strange low-frequency sound – maybe because it does not have an antenna? By the way, which of the two plugs is better for listening to modern fm?

The cassette cartridge does not work – it arms it and immediately turns it off, it doesn’t want to spin.

And the display works only partially.

A few photos below.

Thank you everyone who got involved in helping ♥

X

[Xavier]

Hi again.

I picked up the relay from the beoparts website and put it on.

Now, after I plug it in, the relay disconnects, so it works. But the display appears for a split second “P1” and something that I can’t read ( short video below), and Beo turns off completely. Not for standby mode.

Any suggestions?

X

[Xavier]

Thanks, I completely forgot about it. I will order this relay and a few small things by the way. But what about power? Shouldn’t beocenter work in standby mode without a relay?

[Xavier]

Hi again.

Unfortunately, I can’t find the relay.
On eBay are similar to buy, but in the old relay the distance between coil pins and com pins is about 15 mm, and in those available it is 20 mm (I marked the difference in red color in the picture)

For example, OMRON: https://tiny.pl/wbrlh

And also FINDER: https://tiny.pl/wbrlq

Can anyone tell me where to find the relay?

—————-

In the meantime I did two tests.

First, I connected the beocenter to the power supply without a relay, but it didn’t respond. I thought it would work in standby mode and possibly just not respond to switching on.

I also checked if there is DC power on the paths leading to the coil. The measurement did not indicate a voltage.

How to understand it?

Xavier

[Xavier]

It is difficult to buy a relay with such parameters. I have been in several local electronics stores and there is only the one I used before. I am looking for a suitable relay in the web now.

X

[Xavier]

Hello again.

The modification of the relay (remove the pair of feet) has almost nothing changed.
Now it burns the fuse in the second circuit.
In general, I bought the wrong relay, which causes a short circuit. I have to find the right one.

X

[Xavier]

Good point.

Thank you for the helpful
notes, Dillen.

First I’ll fix the relay and focus on diagnostics, as Mark-sf suggested. Replacement of components will be the next step if necessary.

Xavier

[Xavier]

Thank you Filip.

Ad.1.

As I wrote, I don’t know almost anything about electronics. I use the internet and tips from users.
I gave the B&O to a local electronic service – it returned unrepaired. Another service didn’t want to try fix it.
I’m afraid that shipping somewhere further for repair can be more expensive than the value of B&O. That’s why I tried to fix it locally, and now on my own with your help.

I have not much to lose 🙂

Ad.2.

What do the idle current triggers look like? Where are they? Will I be able to adjust the idle current myself?

Ad.3.

I read about the aging of electrolytic capacitors. Do you mean those with the RDE logo in the middle (marked in the photo – yellow rings)?

Ad.4.

I cannot save the original relay. The coilwires are broken.

Xavier

[Xavier]

OK, thanks.

In a free time I remove the relay and deactivate the last pair of feet. I hope the relay has not been damaged. I’ll let you know if B&O works and if I managed to do more diagnostics.

X

[Xavier]

Hello.

I put on a new fuse, but when switched on, it immediately burned it. The same happened to the other. Fuse socket on the attached photo – two green wires.

Where to look for a short circuit?

Earlier I soldered a new relay with eight legs – the old one had 6. I thought that it wouldn’t matter, because there were factory holes for 8 feet in the PCB. Pair for the coil and three pairs for the contacts, with the last two pairs on the same path, including the theoretically unnecessary one.

Can this relay additional pair of contacts cause a short circuit?

Xavier

[Xavier]

Sorry, but a lot of work and Easter. I had no time for pleasure in recent days…
After all, today I installed a new relay to do the diagnostics you wrote about, but after plugging into the power supply, there is no reaction.
I found a burned fuse. I don’t know when and why it burned down. Anyway, I need to buy a new fuse now.
Slowly in small steps forward 🙂

X

[Xavier]

I thought so 🙂

I already have a new relay. The seller said that it should fit after a small modification – two legs are unnecessary.
But here it’s midnight and I’m tired after work, so I’ll run B&O for diagnosis tomorrow evening.

Greetings from Poland!

X

[Xavier]

Okay, thank you very much.
I hope I understand and handle it 🙂
However first I’ve to buy a new relay, because the old one is in small pieces and I am not sure if they’re all. Besides, the thin copper wires from the coil are broken. But I hope that knowing the operating parameters of the relay I’ll easily choose the right replacement in the local store today.
Later, after installing the relay, I ‘ll do voltage diagnostics, as you suggest, and I’ll inform you about the results.
One thing. I’m not sure what You mean, but the beocenter switches off completely – doesn’t mute.

[Xavier]

I know how to use both 🙂

I soldered the relay by myself. But I don’t want to resolder it again. I’ll put on a new one with the right parameters. Need to buy relay with 6 V coil and the current of 1 A, right?

I’ve got electrical diagrams for beocenter 7700 🙂

What You sugest next?

Xavier

 

[Xavier]

Thank U for your interest.

I think the relay does not hold a voltage flow.
Sometimes after 2 seconds, sometimes after 2 minutes, and another time after 2 hours, the relay disconnects.
Then it’s usually not possible to re-enable B&O. I mean it turns on, but after a second or two I hear the relay clicking and B&O goes into standby mode.

Now I noticed that B&O had a set input voltage of 240 V, and in the network I have 230 V. Should I switch the voltage to 220 or does it not matter, because there is some tolerance range? Besides, the relay is running at a constant voltage, right?

Xavier

P.S.

As I mentioned, I’ve very poor knowledge of electronics. I would be happy to return the device to the service, but in my area no one wants to undertake diagnostics. Only one electronics has tried and said he could’t find the cause of the fault…

[Author]

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