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  • Re: Beomaster 8000 Restoration

    So lets say volume level is currently 4.0. I have only one speaker connected on right. When I press balance right, (1 > 6), i can definitely hear a volume increase with each press, and so does the balance indicator BUT not the main volume indicator. Similarly when I am at max ">" on right and I start reducing (press balance left).. there is a audible volume decrease till 0..then as I move towards left 6, the volume does not reduce till 6. It cuts out for right speaker at "<"
    Posted to General Discussion & Questions (Forum) by dahiyas on Thu, Nov 26 2020
  • Re: Beomaster 8000 Restoration

    Thanks Sonavor. What about the balance control - When moving sound balance towards a side..does the volume on that side go up ?
    Posted to General Discussion & Questions (Forum) by dahiyas on Thu, Nov 26 2020
  • Re: Beomaster 8000 Restoration

    I checked the connections again and they are ok. Volume Offset adjustment ? I did replace both the trimmers on the tone control board. Can I do this without a scope ?
    Posted to General Discussion & Questions (Forum) by dahiyas on Thu, Nov 26 2020
  • Re: Beomaster 8000 Restoration

    To be honest I have read about the 105°C rated capacitors but feeling the heat coming from the regulators after just 5-10mins and the BF858s, it makes more sense now. Played a bit more today and no more heating of heat sink. New challenge - I just have one speaker connected. BALANCE controls - When moving balance to the right the speaker volume increases and when moving to left the volume on right comes down again till 6 and then cuts off completely at "<". I would have expected
    Posted to General Discussion & Questions (Forum) by dahiyas on Wed, Nov 25 2020
  • Re: Beomaster 8000 Restoration

    Looks like our messages crossed !! It did work. Sonavor...I really appreciate your guidance on the additional equipment. I have quite a few things on my list and projects that can use the items. But just when I am ready to buy the next item..something else shows up. I was ready to order power supplies (3 x 60V) and a MS150.2 showed up in DC. I ended up buying it (Cost of shipping from DC to ATL is same as the MS150.2 :-() so power supplies get pushed out ..for now. Have to deal with a upset better
    Posted to General Discussion & Questions (Forum) by dahiyas on Wed, Nov 25 2020
  • Re: Beomaster 8000 Restoration

    Yesss !! It works. Looks like it was the capacitor. So now the sound does not fade in and out. No distortion. BUT 1. I felt the BF858s were really hot. But Krais also mentions the same and Martin/you confirmed that its normal. 2. I also noticed that D5 on the power PCB is also hot. Is it because of the proximity to the voltage regulators ? 3. I checked the trimmers again. The idle current keeps increasing in small increments after setting to 18mV. Similarly, the offset output keep on going higher
    Posted to General Discussion & Questions (Forum) by dahiyas on Wed, Nov 25 2020
  • Re: Beomaster 8000 Restoration

    Yes Sonavor, the trimmer settings were done prior to me pulling out the board and transistors. 18mV and 0mV. After performing the settings, I figured that the right channel was not ok. Yes, all of the components tested ok on the component tester. Only thing I can think of is the bad solder joint. I had done the recap without pulling out the boards on a vertical board. Soldered all the caps again also checked the polarity again. But not sure if that would lead to the BF857 heating up so quickly. I
    Posted to General Discussion & Questions (Forum) by dahiyas on Wed, Nov 25 2020
  • Re: Beomaster 8000 Restoration

    I de-soldered and checked all transistors and diodes. everything checks out ok. Did the loose capacitor cause the volume and heating issue ? I was able to set the trimmers to the right specs. Sonavor - Any other checks you can recommend before I put the board back ?
    Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Nov 24 2020
  • Re: Beomaster 8000 Restoration

    I looked at the PCB carefully and I think one of the legs of a 200uf capacitor was not soldered properly. (Lesson to others - please listen to the experts who recommend pulling out the PCB for recap.). Can that explain the volume fading in and out ?
    Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Nov 24 2020
  • Re: Beomaster 8000 Restoration

    I looked at the PCB carefully and I think one of the legs of a 200uf capacitor was not soldered properly. (Lesson to others - please listen to the experts who recommend pulling out the PCB for recap.). Can that explain the volume fading in and out ?
    Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Nov 24 2020
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