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 tomorrow and try again. 

Thanks again Sonavor !!

The voltage adjustment on the Display board can keep the Beomaster from switching out of Standby mode.

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.

The next time your are seeing the problem check 8TP14 and make sure it is correct. You might also monitor your +5 VDC supply on the Power Supply board (PCB 6). Perhaps it isn't regulating properly.

-sonavor

Hi, there, sorry for jumping on the thread, I have just finished recapping BM8000 since it was completely dead, 

All the functions are working, but no sound and reservoir capacitors are measuring 105VDC. 

any suggestions?

Sehrbug wrote:

Hi, there, sorry for jumping on the thread, I have just finished recapping BM8000 since it was completely dead, 

All the functions are working, but no sound and reservoir capacitors are measuring 105VDC. 

any suggestions?

Are you meaning that the Beomaster 8000 begins in Standby mode when you plug it on and you can switch to the various music sources okay?

If that is the case do you hear the power relays RL1 & RL2 engage and can you measure +-55 VDC on the output amplifier rails?

Did you check for sound via headphones?

Also...It would be better if you create your own thread.

-sonavor

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 the front frame and I can imagine the box along with the weight rolled around inside the frame and the PCB got pulled by the wires. As a result the PCB has a crack right in the middle. Not too bad I think. Should be able to recover. (Could not post pictures due to site issues). I will keep my fingers crossed on the second one.

Maybe I'll start another thread for this.

Darn...you are running into quite a flurry of issues on this project.
I can't imagine how the midrange and tweeter assembly could get ripped away from the frame but the MS150 crossover board does mount to the back of them. You must mean that tweeter/midrange/crossover assembly got pushed into the cabinet from the front. I hope that doesn't mean the metal mounting clips for the assembly broke any of the frame. Maybe all of the mounting clips were not installed (or not installed correctly).
Examine that carefully as you may need to file a damage claim.

When you get a chance you need to post some photos including the inside. I wonder if everything inside is complete.
If you haven't already, check out my old Beovox MS150 forum posts. It is from 2012 but they will give you an idea of what you should see inside.

-sonavor

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 😁

Finally am back on the project.

On the positive side I fixed the unresponsive tuner dial. Replacing the OP240A fixed the issue. (same as the volume sensor module - https://beolover.blogspot.com/2018/02/beomaster-8000-repaired-rotary-volume.html). 

Added Beolab 5000 speakers to my collection.

So the BM8000 works well .....only when it works. Issues -

1. There are times it wont come out of standby..pulling out power and plugging it in again fixes the problem. Takes couple of retries sometimes.

2. When it does come on, the keys/dials become unresponsive after couple of minutes. and the first indication is that the display characters start displays random pattern. Music continues playing without any issue but I cant use the keyboard and the displays have random characters. Also can't put system in standby. Only way out switch off power and start again.

3. A new symptom I am seeing is that in standby, there are times one one of the bars on the frequency display flickers or the source indicator display will come on...This is all random. Again, when this happens the keypad is unresponsive. power cycle gets it back to normal.

So for the CPU and Display boards, I have changed all the connectors. Checked the via's.

Looks like the CPU board is still the issue. 

Any other suggestions ?