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Beomaster wont powerdown Beolab Speakers

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Weebyx
Top 100 Contributor
Denmark
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Weebyx posted on Mon, Oct 2 2017 7:54 AM

Hi....

I am having trouble with a Beomaster 7000 which is almost back to life :)

The issue is that it will not put for instance Beolab Penta into red led mode, but remains in green even though the beomaster is in std.by, but with display off.

It seems as the 12v line keeps the speaker on, because of the voltage remaining at 1.3/1.4v.

I have compaired the 28v line with the 12v line in std.by, and it looks like there is AC on the 12v line ? is that a correct understanding, and does anyone have any ideas on what is going on ? All caps in the powersupply has been replaced with new, and the voltages around the board is very much as they should when powered on.

My measurements on the scope has been at TR2 and TR5 collector. The 28v line is nice and flat, but the 12v line is not as nice..

 

 

 

 

 

I would appreciate any input as this is one of the last issues I face, but cannot seem to get a hold of :)

If anyone has an open BM6500/7000 they could compare measurements on, that would also be nice :)

 

/Jacob

Answered (Verified) Verified Answer

Weebyx
Top 100 Contributor
Denmark
825 Posts
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Verified by Weebyx

I am an idi.... !!!

Could really not figure out what was happening with the Beolab Penta MK2.. It behaved really weird when connected to the BM7000.

Decided to connect my Penta MK3's to the BM instead.. all is fine with the BM7000, there must be something wrong with the Penta 2. I have completely restored the amplifier in both the MK2 and 3, and they are identical inside, so it really puzzles me. Maybe I have reversed 2 wires from the powerlink socket in the MK2. need to disassemble them, and find out :)

Sorry for the spam :)

/Jacob

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Weebyx
Top 100 Contributor
Denmark
825 Posts
OFFLINE
Bronze Member
Verified by Weebyx

I am an idi.... !!!

Could really not figure out what was happening with the Beolab Penta MK2.. It behaved really weird when connected to the BM7000.

Decided to connect my Penta MK3's to the BM instead.. all is fine with the BM7000, there must be something wrong with the Penta 2. I have completely restored the amplifier in both the MK2 and 3, and they are identical inside, so it really puzzles me. Maybe I have reversed 2 wires from the powerlink socket in the MK2. need to disassemble them, and find out :)

Sorry for the spam :)

/Jacob

Beobuddy
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Utrecht, The Netherlands
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The mk2 and mk3 are not completely identical.

The difference can be found in pin 1 and pin 4 Cut the trace(s) on the socket PCB coming from pin1. Join then the rest of the trace (from pin 1) going into the amplifier together with the trace comping from pin 4.

Beobuddy
Top 25 Contributor
Utrecht, The Netherlands
3,207 Posts
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Founder

You forgot to mention the small "MK2" detail...

Beobuddy
Top 25 Contributor
Utrecht, The Netherlands
3,207 Posts
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Founder

As posted in the general forum, here (again) the picture with the mofified trace at pin 1 (and shortened to pin 4).

 


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