[filip_kbh]

I have now tested for continuity between all pins. There is only continuity where there should be continuity. My money is on the BM7000. I saw Die Boegener made reply to someone around datalink not working after a thunderstorm. Since I did not have my BM7000 since the beginning, I have no clue what has happened to it previuosly.

At https://archivedforum.beoworld.org/forums/p/28464/223667.aspx he replies:

…

some parts in the datalink section are dead. Nothing special, 50 cents on the pre amplifier board.

Replace:

D5= 12V zener diode 0.5W

TR1=BC547

That’s all…

Not sure if I should look into that at some point.

[Guy]

filip_kbh wrote:

Not sure if I should look into that at some point.

That would make sense – those components connect to the TV/AUX AAL data (pin 6) which would explain why the rest of your datalink (between BS7000 products) is working fine.

[filip_kbh]

Great – I will order those parts and let you know how it goes.

There are several versions of the BC547 – an A, B, and C version. Which one to choose? Or will they all do?

[Guy]

filip_kbh wrote:

Which one to choose?

Service manual states BC547B

And for the diode it states: 1N4148

[filip_kbh]

Thanks a million. I really appreciate the help.

/Filip

[Guy]

No problem – happy to help and good luck with the fix. I hope it resolves the problem! ?

[filip_kbh]

Just reporting back. Everything works now. Still there is the high-pitched noise that I presume may come from the display of the BL3500. The display does not show the clock – but I guess it would take it from a video source and not just the BM7000?

I inspected the pre-amp board of the BM7000 and could see multiple cracked solder joints, also for D5, so I presume that is where the fault was.

[filip_kbh]

I spoke too soon. It worked on my living room table.

And I have narrowed down the problem. I have an Almando surround box II connected to Powerlink. When that is plugged in, the datalink does not work. Argh.

[Madskp]

The powerlink data pins also has connection to this transistor, on the line going out to the left side of the diagram. So there might be something disturbing between the data signals

[Guy]

Madskp wrote:

The powerlink data pins also has connection to this transistor, on the line going out to the left side of the diagram.

That was well spotted – I took a while to find that link even after you had explained it! It does add an extra level of complexity o-if third-party devices (like the Almondo) are added to the datalink/powerlink setup, and I am not surprised that it can present problems in some circumstances.

[Author]

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