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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

Latest post 12-20-2011 10:39 AM by chartz. 87 replies.
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  • 09-25-2011 2:49 PM In reply to

    Re: Beomaster 8000 tuner : nothing past 97 MHz

    I always put a ceramic 100nF between + and GND on my controller's power supply.

    There seems to be a 1nF only here; can't see if they are ceramic - sadly I don't own a BM8000: I would put those 100nF in parallel to C16 / C46 and try again as filtering the 7805 obviously helped a little.

    Just a thought....

      Gunther

     

  • 09-25-2011 4:28 PM In reply to

    • Step1
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    How strange, and frustrating Jacques, I feel for you mate! Definately sounds like a noise issue! How do the little supply inductors look? They aren't unwound / distorted or otherwise in-effective are they? Have you looked at the crystal area I am sure it isn't impossible to have a minor stability issue that throws off certain functions...? How about a small decoupling cap actually across the micro supply pins and lay the thing across the chip body? I dunno, funny ideas for a funny problem!

    Olly.

  • 09-25-2011 5:09 PM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Hi Olly,

    The inductors are fine. Do you mean the crystal itself could be the cause of the problem?

    The frequency counter increments fine (displays correctly) but I'm not a processor specialist... Some kind of instability happens somewhere but I can't see it. I wish I knew how to test a processor!

    Thanks for suggesting this. A new 2MHz Xtal, perhaps?

    Jacques

  • 09-26-2011 4:52 AM In reply to

    • Step1
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    I guess it is a bit of a stab in the dark Jacques but unless anyone else thinks otherwise you not got a lot to loose? Of course, you still can't entirely rule out the processor but it is looking much less likely now!

    Olly.

  • 09-26-2011 12:05 PM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Opening that can again... not something I'm looking forward doing!

    Jacques

  • 09-26-2011 12:13 PM In reply to

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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Put a hinge on the thing Laughing

    Olly.

  • 09-28-2011 1:08 PM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Step1:

    Put a hinge on the thing Laughing

    Opened the can again. Nothing wrong in there... Xtal just fine.

    Checked the protection zener (D6), the cap (new). I get 4.93V, 4.97V with processor unplugged. 

    I'm going to give up, unless someone comes up with:

    1) a stroke of genius,

    2) a processor board for rent! Laughing

     

     

    Jacques

  • 09-28-2011 1:24 PM In reply to

    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Did you already try the 100nF blocking ceramic caps directly at the processor's supply as me & Olly suggested?

  • 09-28-2011 1:28 PM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Yes, they are in place!

    Jacques

  • 10-30-2011 10:58 AM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Hi all,

    This is pathetic. Still no idea what to do. Ever since the 7805 change the tuner has remained stable, but it won't go over 102 MHz.

    I haven't been able to source another processor board. The last Beomaster 8000 receivers I saw on eBay were sold for ridiculous prices and they weren't even nice to look at!

    Sad

     

    Jacques

  • 10-30-2011 3:39 PM In reply to

    • Step1
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    How much are they going for Jacques? I figured they must fetch a fair sum but as I have not yet seen one sell on UK ebay I haven't a clue what they are worth!

    Olly.

  • 10-30-2011 3:46 PM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Hi Olly,

    Well the last one went for 380€!

    It wasn't even looking good...

    Olly, I still have that Beocord 9000 pinch roller for you!

     

    Jacques

  • 12-20-2011 10:39 AM In reply to

    • chartz
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    Re: Beomaster 8000 tuner : nothing past 97 MHz

    Hi,

    Finally found the remote... but still no processor module!

    Jacques

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