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Beocenter 7000 heating and shutting off issue

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CrabbyHermit
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CrabbyHermit posted on Mon, Feb 8 2016 9:11 AM

Hello all, hope you're well today.

Story:

I purchased a Beocenter 7000 (type 1801) from a genlteman that had recently retired and was planning on leaving the country. He had purchased it back in '79-'80 and has had it stored away for almost 20 years if not more. I have been using an old Sansui system myself, but I have really fallen in love with this machine. It sounds phenomenal and its gorgeous. It works perfectly aside from one issue.

Problem:

Through 15-20 minutes of playing/running the machine shuts off to standby mode on its own. The heat sink fins become very hot to the touch. I have tried running it with the speaker disconnected, speaker selection button disabled, and the volume at zero. Yet, the problem persists. I have even disconnected the cables leading to the output circuit (seen here and cables here).

I recently found a local B&O store and too the machine there. I discussed the problem technician; his diagnosis being that the problem is from the left output amp IC (Which he indicated to me on the schematic I had). Sadly, B&O stopped supporting the product and replacement parts are unavailable.

So, the reason I am here is

1. To ask for your second opinion if this problem is in fact due to the faulty IC seen in the schem above.

2. I am also not quite sure which of the number codes represents the component it need to find replacements for. I would like to replace both left and right channel ICs.

3. Would the replacement of the component have any impact on the tone of the sound?

4. Which brand of ICs would you trust in as a solid replacement?

Technical Specs:

Beoncenter

Speakers I am using (got them from the person with the Beocenter)

I would appreciate any help anyone can provide. I have come to really love Beocenter and want it to be able to utilize it to its full potential.

- The Crabby Hermit in his den.

 

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Dillen
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Copenhagen / Denmark
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Dillen replied on Mon, Feb 8 2016 11:31 AM

Welcome to Beoworld !

If the Beocenter is actually playing fine - before it gets warm and shut down, ask your repairer
to replace the idle current trimmers and adjust the idle current.
Common fault.

Martin

CrabbyHermit
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Thank you very much for your reply.

- The Hermit

Mattb61
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Hello there, I bookmarked this as I was having similar problem with my Beocenter 7007. I could make it stay on longer using a fan pointed at the amp but recently it has stopped working. It starts and shuts off almost immediately. I wonder if you were able to correct yours with parts and whether you could advise me. I live in a place where a Hi Fi repair shop is non-existent.

Mattb61
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I have had a similar problem with my Beocenter 7007 which would shut down after an hour or so; now it shuts down after several seconds. I need to know what IC trimmers I need to find and as I have no access to a repairer if there is a step by step guide to their replacement available online? Thank you.

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