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Call Out To Beomaster 8000 Owners

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sonavor
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sonavor posted on Mon, Feb 22 2021 4:41 PM

Hi fellow Beomaster 8000 owners.

As an owner of two fully restored Beomaster 8000 receivers I know how well they perform. My two receivers have been working flawlessly for quite some time. My first Beomaster 8000 has been operating since 2013.  My second one since 2019.

While I have enjoyed my Beomaster 8000 receivers I know of four where the Beomaster units have exhibited some very unusual behavior. 

The reported problem some owners are seeing is the Beomaster 8000 will sometimes turn on (usually to FM preset number 2) from Standby mode by itself.  At first we thought the problem was just some anomaly.  However, the problem persisted for the small group reporting it.  I have been talking to these owners about this problem since 2018 and the problem appears to occur pretty regularly for these Beomaster 8000 units.

I have had one of those problem Beomaster 8000 units in my workshop before. After testing it for three months I could never get the problem to appear.

It would be easy to assume then that the problem has something to do with electric power in the regions where the problem occurs but we have done plenty of tests to rule that out.

My suspicion is that the problem is related to the remote control receiver circuit in the Beomaster 8000 but so far, swapping power supply boards (which have the remote control circuit on it) has not resulted in any change to the owners with the problem.

I would like to know if there are any other Beomaster 8000 receiver owners besides the four I know about who have experienced this problem.  The four owners that I know have the problem are two Beomaster 8000 owners in Canada (they reside on opposite coasts from each other).  One owner in the USA.  Then finally, one owner in Australia.  So the problem is pretty spread out.  I am curious to know if this problem occurs in Europe, Asia, Africa or South America.

Thanks,
sonavor

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Schletti82
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Suggested by Schletti82

Hi, i have a few Beomaster 8000 myself and restored a few others and never had this issue coming from the Beomaster.

I had one Beomaster 6000 with this error but ist was coming from the Remote.

tried this Remote with a few beomasters and it was fully working, but sometimes it sended the Signal to start the Beomaster.

so maybe they should Look at their Remote. Take out the Batteries and see what happens.

 

sonavor
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Schletti82:

I had one Beomaster 6000 with this error but ist was coming from the Remote.

tried this Remote with a few beomasters and it was fully working, but sometimes it sended the Signal to start the Beomaster.

so maybe they should Look at their Remote. Take out the Batteries and see what happens.

 

Hi,

That is very interesting and definitely something I will suggest.

Thanks,
-sonavor

 

Spassmaker
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Hi

That´s funny, I thought I would be alone in the world with a BM 8000 which comes up from alone.

Had the same issue with the amp starting usualy on FM P3.

First I thought, like you, about the IR reciever and a energy saving lamp which stays over the amp. Changed the lamp to a regular bulb > nothing changed.

Fed the amp over a 220 V UPS  > nothing changed.

I searched a lot and found out that the STBY / 5 Volt line comming from PCB 6 via P48-6 has an issue which I could not sort out.

I know it´s the voltage which controlles the relay circurit ...but.

the voltage is near 2.5 Volt in STBY and not the expected 5 Volt.

I opened the line comming from R55 and the voltage comming fro uPC was ok 5 volt or Low level.

headscratching till no hair is there anymore ;-))

I can´t realy remember what I did but I think I changed one or two resistors to another value think R55 and R56 on PCB 9 and R36 on PCB 6, That brought the voltage near 3,5 Volt in STBY and the amp was woking as expected.

I changed the value quiet carefully because I didn´t want to shoot the uPC and as there was no more resonable change of the voltage I let it be as it was.

This is not the ususal way how I work but I rechecked and renewed  following components on PCB 6: TR11, TR12, D12, R67, R68 and nothing changed.

So the Beomaster is still working and I let it as it is.

Maybe you can find something suspect in this area around TR11, TR12, D12 and the involved resistors.

Where is the voltage drawn down to 2,5 volt?

What is about the misery voltage -20 mV between R67/R66, from where comes the minus? and the 43mV at the base of TR11 when the unit is turned on?

Another spot to look at would be the STBY line comming from uPC PIN 14 via R57/R58 P76-7 to PCB 6 P48-4 R50 to TR5.

Hope to give you some points to think about if not already done ;-))

 BTW: 220 Volt in Germany

Kind regards

Christian

 

chartz
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chartz replied on Mon, Feb 22 2021 8:39 PM

Hi John,

No such issues with my two BM8000, no.

 

Jacques

sonavor
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Spassmaker:

Hi

That´s funny, I thought I would be alone in the world with a BM 8000 which comes up from alone.

Had the same issue with the amp starting usualy on FM P3.

First I thought, like you, about the IR reciever and a energy saving lamp which stays over the amp. Changed the lamp to a regular bulb > nothing changed.

Fed the amp over a 220 V UPS  > nothing changed.

I searched a lot and found out that the STBY / 5 Volt line comming from PCB 6 via P48-6 has an issue which I could not sort out.

I know it´s the voltage which controlles the relay circurit ...but.

the voltage is near 2.5 Volt in STBY and not the expected 5 Volt.

I opened the line comming from R55 and the voltage comming fro uPC was ok 5 volt or Low level.

headscratching till no hair is there anymore ;-))

I can´t realy remember what I did but I think I changed one or two resistors to another value think R55 and R56 on PCB 9 and R36 on PCB 6, That brought the voltage near 3,5 Volt in STBY and the amp was woking as expected.

I changed the value quiet carefully because I didn´t want to shoot the uPC and as there was no more resonable change of the voltage I let it be as it was.

This is not the ususal way how I work but I rechecked and renewed  following components on PCB 6: TR11, TR12, D12, R67, R68 and nothing changed.

So the Beomaster is still working and I let it as it is.

Maybe you can find something suspect in this area around TR11, TR12, D12 and the involved resistors.

Where is the voltage drawn down to 2,5 volt?

What is about the misery voltage -20 mV between R67/R66, from where comes the minus? and the 43mV at the base of TR11 when the unit is turned on?

Another spot to look at would be the STBY line comming from uPC PIN 14 via R57/R58 P76-7 to PCB 6 P48-4 R50 to TR5.

Hope to give you some points to think about if not already done ;-))

 BTW: 220 Volt in Germany

Kind regards

Christian

 

Thanks for the reply Christian. I guess you can be Case #5 :-)

When I had one of the Beomaster 8000 units in my shop for three months (and was not successful in reproducing the problem)...
I tried simulating a short power outage as well as momentarily triggering the reset line to the Microcomputer board. Those events will only result in the Beomaster 8000 coming back to Standby.

I think the problem has to cause an event on a source selection control line for the auto-turn-on to occur.
Similar to the test suggested by Beoworld member: Schletti82 which is to remove batteries from the BM8000 remote control I was going to suggest disabling the control lines from the remote control receiver (on the BM8000 Power Supply board).  It still seems like a likely suspect.

Just so you know, I did ask a couple of the BM8000 owners with the problem to unplug/remove their BM8000 control panel to eliminate that component as a problem source. The problem still remained.

That still leaves the remote control circuit a suspect.

-sonavor 

Spassmaker
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Forgot to mention that I exchanged the controlbutton board as well > nothing changed

Completely overhauled with all caps and so on. Desoldered and resoldered all plugs and vias which are involved.

Christian

Lee
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Lee replied on Mon, Feb 22 2021 9:58 PM
Mine used to do this all the time. It was sorted by resoldering the pull down resistor pack on the CPU board for the keypad. The left hand pin that goes through a via was the culprit I believe.
sonavor
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sonavor replied on Mon, Feb 22 2021 10:18 PM

Great.  Thanks for that Lee.

It will be interesting to see if or how these all relate.
I can see an issue in the keypad path causing a problem.
In your case though, did the Beomaster 8000 just randomly turn on by itself and start playing an FM source? Was it always the same FM source (i.e. FM 2 or FM 3)?

In one of the four cases I looked at the keypad was eliminated as a problem source. For that case I think that leaves the remote control receiver which sends its commands to the BM8000 Microcomputer board via P76-10.  P76 has other signals not related to the remote control so it wouldn't be a good test to disconnect P76. I would like to see someone with the problem try removing that remote control path though.  Maybe by temporarily removing transistor 6TR26 (on the Power Supply board).

-sonavor

Lee
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Lee replied on Tue, Feb 23 2021 11:56 AM
It was always a FM source. I think it varied which program though. It’s been that long since it did it that I may be miss remembering. I’m sure Rudy wrote a post about this on your blog.

sonavor
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We have a post about the opposite problem...a Beomaster 8000 going into Standby from playing a music source. That problem was with bad vias on the Microcomputer board.

With this auto-turn-on problem it is sounding like possibly more than one problem. In your case it was with the Microcomputer board.
On the four cases I reported (and now five with Christian's BM8000) the Microcomputer board was replaced and the problem still existed. 

I would like to see if someone that has the problem can try removing transistor 6TR26 (from the Power Supply PCB) to disconnect the remote control connection to the Microcomputer board and see if that stops the auto-turn-on from happening.

-sonavor

Dillen
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Dillen replied on Tue, Feb 23 2021 5:38 PM

I think I would focus a bit on the 5V supply.
Bad filtering - f.e. the 10uF capacitor at the regulator - can cause many problems.
Could perhaps also be a certain batch of voltage regulators causing this.
A little additional filtering when the 5V reaches the processor board wouldn't hurt either (a 10uF and a 100nF in parallel perhaps).

Martin

sonavor
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Hi Martin,

I have done quite a bit in those areas already. I even tried a couple of different BM8000 Power Supply boards. That doesn't guarantee that eliminates the board and its components from the problem of course. I have also tried several different Micrcomputer boards. Both Rudy and I have monitored the +5VDC line as well but no luck catching the problem so far....which, of course, is because I haven't been able to experience the problem first hand.  One of the problem Beomaster 8000 units sent to me never exhibited the problem once.  I had it plugged in and in use here for three months.

I toggle back and forth between whether the problem is environmental or electrical. That is why I created this thread to see if the problem has occurred in other places and to see how common or uncommon the problem is. It appears to be extremely uncommon and there doesn't seem to be any published service bulletin from B&O about it. There is a similar problem that B&O did put out a notice about in the Beomaster 6000 (Type 225x).  In that they do reference the +5 VDC regulator and something in the remote control receiver.  So those two areas are something I would like to see some BM8000 owner with the problem try to investigate.

John

Spassmaker
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Hi John

Had investigated the controllbutton board, cleaned all contacts but no difference.

I've had this problem most times after the Beomaster was plugged into 220 V, wait 1 or 2 miutes and "click" > ON

After the unit was switched off aggain the Amp was quiet. and didn't start on it's own for hours.

When the Amp is continious connected to mains the problem seems to be gone.

Kind regards

Christian

Spassmaker
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A little bit Off topic does someone  noticed the Balance Display glimming parallel to the Volume Display after installing new SMD LED's?

If yes did anybody solve this issue?

Thanks for advice.

Kind regards Christian

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