Now how's that about step by step progresses....

There's still mono to be pressed or the right channel is very quiet. Output on stereo decoder board is on both channels - lost on the way to the power amp. Left signal on volume slider missing.

STEREO!!!

Balance, Bass, Volume sliders fine. Treble left not functional, slider pot ok. Now what to expect from latest experience?

Yes, broken wire again. Treble now fine as well.

Ok, now it's time for a little cosmetic. Let's have those high-heels corrected:

The four 5k trimmpots are to be left alone according to the service manual so I'll do. Idle current adjusted to ~80mA.

So that's my latest internal status - plenty of caps that could be renewed but they are working fine - probably some homework for the new owner

I've had enough surgery for the day.

Running for approx. 2 hours now on middle volume being barely warm with some RL60s - you newer know what you're going to expect overseas

  BM4000

Look at that doctor go!!! And listen to that, all fixed up and playing in stereo!

Very good work Gunther! Yes, leave the caps for me.. and some other stuff! I need to do something on this project too!

EDIT: I am still clueless as to how so much violent damage could happen to one of these things internally..... Absolutley crazy!

Evan:

how so much violent damage could happen to one of these things internally.....

So do I. Looks like someone with superficial knowledge tried to fix it but was causing more trouble than he repaired. Don't know much where it was done but the guy who sold it to me told me already about some loose wires and the broken PCB behind the meter. It definitely wasn't him for sure, he got it that way.

But I do like challenges - especially if I have time to cure them. Only point I was thinking about givin' up was when suddenly tuner was back to no-function as it looked pretty much like the very first time I switched that buddy on. I wonder if the second PCB trace failure was already latent and got worse as soon as the audio power amp had to deal with real speakers instead of my Form1 that I start listening first on each repair. And the headphone socket had a little loose contact that stopped the tuner with that very effect sometimes - strange. Now it's insensitive on knocking PCB's or parts

Had it running for half of the day on TAPE1 with internet radio out of my Laptop. BM4000 will have to change his listening habits as music style will surely be different. And I think I remember something like you are ok with any music but country - exactly what I am listening mostly now

I'll let BM4000 report when we're finished with testing the phono input so you won't have to deal with Rich's complaints in the future

It's humming a little on both channels when turned up without anything connected and that's a good sign. And I'm thinking of Mika's idea with the reverse RIAA; circuitry is easy to built if it weren't the strange component values. (BTW is it were'nt or weren't? )

Evan:

I need to do something on this project too!

That's why I have to keep myself from starting some cleaning work - it's definitely neccessary. But not to spoil your fun

  Gunther

Well, this certainly is a challenge, huh? You are handling it just fine though! I'm glad you are doing it because I know this is over my head.

Get your country fill now Gunther and 4000! There won't be any of that here! However, Mr. 4000, I can assure you the music collection is great!

Looking forward to the next report.

PS - weren't

hemenex:

Evan:

how so much violent damage could happen to one of these things internally.....

So do I. Looks like someone with superficial knowledge tried to fix it but was causing more trouble than he repaired. Don't know much where it was done but the guy who sold it to me told me already about some loose wires and the broken PCB behind the meter. It definitely wasn't him for sure, he got it that way.

But I do like challenges - especially if I have time to cure them. Only point I was thinking about givin' up was when suddenly tuner was back to no-function as it looked pretty much like the very first time I switched that buddy on. I wonder if the second PCB trace failure was already latent and got worse as soon as the audio power amp had to deal with real speakers instead of my Form1 that I start listening first on each repair. And the headphone socket had a little loose contact that stopped the tuner with that very effect sometimes - strange. Now it's insensitive on knocking PCB's or parts

Had it running for half of the day on TAPE1 with internet radio out of my Laptop. BM4000 will have to change his listening habits as music style will surely be different. And I think I remember something like you are ok with any music but country - exactly what I am listening mostly now

I'll let BM4000 report when we're finished with testing the phono input so you won't have to deal with Rich's complaints in the future

It's humming a little on both channels when turned up without anything connected and that's a good sign. And I'm thinking of Mika's idea with the reverse RIAA; circuitry is easy to built if it weren't the strange component values. (BTW is it were'nt or weren't? )

Evan:

I need to do something on this project too!

That's why I have to keep me from starting some cleaning work - it's definitely neccessary. But not to spoil your fun

  Gunther

Oh, I'll probably still find something to complain about.  That's what I do!

Rich:

And I think I remember something like you are ok with any music but country - exactly what I am listening mostly now

I love country, try this one even Evan wil love it, Cadillac, but will need a subwoofer to get it all out

Nice step by step diagnosing and repairs. And nice photos.
I like.
PM me your address and I'll find a correct S-meter bracket.

Martin

Rich:

Oh, I'll probably still find something to complain about.  That's what I do!

Ok, and we will most likely find something to prove you wrong again

   Gunther

@ Martin: Thanks, PM sent.

Evan:

Looking forward to the next report.

OK, so now I'm in a state I can live with. Now should be able to survive the long travel

First I had to prove the "Rich"-Test:

Phono plays fine - wow. Something that worked without having the need of repair

Well, now's assembling time. Sheet metal screws replaced by pretty similar M4 ones; at least they are black as well. And they have the correct thread

Brackets still missing, screws not original but fitting & one foot fitted who's definitely wrong but to be sure not to scratch my new owner's furniture by chance - he wouldn't be pleased I can imagine.

And as he wants to do something too - here's to you

Great thread, I always enjoy quality photos of B&O innards

I have a BM4000 as well, but now I'm not sure if I've ever opened it... it worked fine when I got it (even without apparent idle current problems) but has a noisy transformer, so I haven't really set it up for use anywhere.

And finally - something's missing here. But it's an easy mechanical fix - if you're not someone with 2 left hands.

I can imagine a piece of black plastic will do.

Unless there are new findings (hopefully not) I will have several days of test run through the day and will be quiet for now.

This thread will be continued when travel time gets closer. So much for now, here's an actual picture how I look like after all these treatments.

All the best,

   BM4000 (happy again )

hemenex:

Evan:

Looking forward to the next report.

OK, so now I'm in a state I can live with. Now should be able to survive the long travel

First I had to prove the "Rich"-Test:

Phono plays fine - wow. Something that worked without having the need of repair

Well, now's assembling time. Sheet metal screws replaced by pretty similar M4 ones; at least they are black as well. And they have the correct thread

Brackets still missing, screws not original but fitting & one foot fitted who's definitely wrong but to be sure not to scratch my new owner's furniture by chance - he wouldn't be pleased I can imagine.

And as he wants to do something too - here's to you

The Rich test is very important, it is critical to the foundation of my TT!

Good, proper hardware, always a plus! I have actaully planned some new furniture for this installation, furniture that would have the reverse effect - damaging the BeoMaster potentially. But, that foot will protect it. I wouldn't be pleased if either happened!

Ok, I can handle the rest! You are looking FANTASTIC 4000!!!! Thank you so much Gunther!!

tournedos:

 

I have a BM4000 as well, but now I'm not sure if I've ever opened it... it worked fine when I got it (even without apparent idle current problems) but has a noisy transformer, so I haven't really set it up for use anywhere.

Oooohhhh, open it, open it, open it!  You know what waits inside....

Rich:

Oooohhhh, open it, open it, open it!  You know what waits inside....

I certainly know what should wait in there, but for some reason it has been robbed from nearly all the kit I've bought

Anyway, the forum unfortunately has a better memory than me: of course I have been in there and even found the schematic

I love this thread, mr. 4000! Nice to see you in better condition. I happen to own a couple of your big brothers in natural aluminium, Beomaster 4400. Going through one of them with new capacitors when I have the time for it

Just a quick update: Look what came on Tuesday

I'm gonna have the artificial part removed and replaced by an original

I do have friends !!!

Martin sent me some genuine parts to make me feel better. So much for the bracket:

And the black thingies - what are they?

They are definitely NOT plastic - should have remembered that

And look - I have a new ID - and it's NOT a copy!!!!!!!!

Thanks so much for all this - I'm really being cared of

And the looks get better every day - gaps are closed.

So long - will be back if any news..

  BM4000

@Soren H: You could have a look at me next May

THIS IS AMAZING!!! Thank you Martin!!! And Gunther, of course (for your hard work as usual)!!!

Looking great Mr. 4000, just great!!