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Beovox MS150

Last week I saw a MS150 come on the market and decided to buy it as I saw this as the perfect partner for BM8000 I am working on currently. Only challenge, I had to trust UPS to pack and ship the speakers safely from DC to Atlanta. (and without the speaker grilles). They didn't survive the trip and I have filed a claim with UPS but there is damage. Cosmetically the speakers are fine..no damage to frame...there are normal scuffs on the black frame but that can be cleaned up easily. Speaker 1

Posted to General Discussion & Questions (Forum) by dahiyas on Wed, Dec 2 2020
Filed under: MS150

Re: Beomaster 8000 Restoration

You can say that again Sonavor... UPS is giving me a helping hand here. The other speaker was to show up today and didn't get delivered. The UPS hub is about 10 miles from my house. Is has been sitting there for about 72 hrs now..the status shows EXCEPTION. Either they broke it completely or some UPS guy is enjoying the speaker right now

Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Dec 1 2020

Re: Beomaster 8000 Restoration

Sonavor - I did not see the standby issues come up again today. I will later remove amp for another Penta and try the balance functionality. Thanks ------------------------ Meanwhile - I have another project at hand. The MS150 showed up - only 50%. Two speakers two separate packages. Shipped together. Both reach Atlanta local hub and then 1 delivered @ home today . Looks like they were too big for the delivery van . AND for the one that reached, the tweeter and midrange speaker box got ripped from

Posted to General Discussion & Questions (Forum) by dahiyas on Sun, Nov 29 2020

Re: Beomaster 8000 Restoration

The system has now gone to where I started. Not getting out of standby mode. Looks like the CPU PCB is still causing issues. I will check again today. I also have the ribbon cable connectors on my list (already bought). Need to change those. Couple of them are loose. Have adjusted the pin for tighter fit for now but I will replace them. Yes, I had forgotten about the voltage adjustment on the display PCB. I will do that if and when the standby issue is fixed. I will wait for my MS150's to arrive

Posted to General Discussion & Questions (Forum) by dahiyas on Fri, Nov 27 2020

Re: Beomaster 8000 Restoration

So before I tried anything on the system I tried getting it out of standby and it came alive without changing anything . Standby..TP1..standby..tried multiple time...it behaved properly except once where after switching on the volume indicator showed ".4" and system became unresponsive again. I am going to leave it on for sometime to see if I see the issues come up again. Meanwhile I did measure v at 8TP14. It was 5.075V. I did get it to 5.0V.

Posted to General Discussion & Questions (Forum) by dahiyas on Fri, Nov 27 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

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

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

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

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