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Beomaster 5000 goes off.

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Rick
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Rick posted on Thu, Mar 8 2012 3:45 PM

I have a Beomaster 5000 that will now only play about 20 minutes then mutea off.  HIt the phono select button and it comes right back on but for less time each time I do this.  I think it is temp related and when I open it up to observe the fan I never see it spin.  Any known area to look at?  I can bring it right back up with the MCP also but have the same shutdown problem. 

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Rick
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Answered (Verified) Rick replied on Fri, Mar 9 2012 10:44 PM
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ran adjustment and all is perfect.  Ran for 6 hours.  I will most likley be replacing them with the capacitor overhaul.

 

Thanks much

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Peter
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Peter replied on Thu, Mar 8 2012 7:21 PM

It needs servicing - it will be a power imbalance due to variable resistors going out of spec and possibly capacitors doing the same - the latter seems less common in the 5000 than earlier models but not unheard of. How to repair it depends on your electronics skills. If you have a multimeter and know what you are doing, get the service manual and get on with it. Dillen can no doubt supply a repair kit full of the necessary goodies. Otherwise get someone to do it for you!

Peter

Rick
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Rick replied on Thu, Mar 8 2012 7:48 PM

Thanks for the responce.  I can get and install a cap kit from Dillen.  Waiting on one for my 8002 I just fixed.  Is the fan not spinning ever a problem that can be cause by this?  This the the 80's version of the 5000 also.  I have the service manual and will review all spec settings.

 

Rick

tournedos
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Check the "no-load current setting" in your service manual; with good probability it is those particular two trimmers that are shot. Replacing and readjusting those alone will most probably fix your problem. Consider the recap after that if needed.

The fan not working is not the cause... when the idle current setting is grossly wrong, the Beomaster won't have time to heat up enough to start it before the overload protection shuts it down - in fact I have never seen it turning in any of this series Beomasters!

--mika

Rick
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Rick replied on Thu, Mar 8 2012 8:29 PM

Great.  Just now looking at the manual and going to try the adjustement of R126 and R226.  If they are bad I'll order some up.  Hoping I can clean and adjust them though. 

Rick

tournedos
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Better just replace them. They get toasted in 25+ years. Even if they began to work after a clean and adjustment, you'll be back in there soon doing it all over again. You can (and should) of course first just try adjustment and see if that cures the problem, then you'll know you're looking at the right thing. Or just measure the idle current as it is now, I suspect you will find that it is far off.

When replacing, only do one at a time and preset the new trimmer near the position the old one was. If they are far off, the protection circuit may trigger before you have time to adjust anything.

--mika

Rick
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Rick replied on Thu, Mar 8 2012 9:52 PM

Thanks.  Since I am think of doing a full cap replacement on all of my B&O 5000 stuff I might just do it and the controls at one time.  I have been in electronics over 30 years and know that caps are the number one problem.

I'll be starting this in couple of hours.  Darn customer want me to fix their stuff first!!!

Rick
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Answered (Verified) Rick replied on Fri, Mar 9 2012 10:44 PM
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ran adjustment and all is perfect.  Ran for 6 hours.  I will most likley be replacing them with the capacitor overhaul.

 

Thanks much

tournedos
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Good to hear Yes - thumbs up

You will probably notice that it also runs cooler in general now.

--mika

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