Schletti82 wrote:

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

 

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

 

Hi John,

No such issues with my two BM8000, no.

 

Spassmaker wrote:

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 

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

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.

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

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.

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