[carljh]

Reply to the KolfMaker: I started to connect the Sonos player via the RCA connectors and that worked for one speaker but not the other one. Now I have one speaker connected via the RCA connector and the other one via the DIN connector and 4,5V power supply to pin 4 in order to activate the speaker. This work but ideally I want it to work with the RCA  auto start method for both speakers.

I will try to find the problem this weekend if I can find some time.

[carljh]

I will also look into this in the weekend and try to measure around the “auto start” circuit and compare the difference between the good speaker and the bad one. Please find the service manual attached which include circuit schemes and block diagram as well as some instructions that can help. It mention that you can short-circuit the C83 in order to block the autostart so this capacitor could be the error cause. I will check the electrolyte capacitors because these can show strange behaviours if the are old.

If you want to make your own RCA to DIN cable, connect pin 4 to maximum 5V and pin2 to ground. 

Please note the the RCA-DIN connector will be mirrored compare to the picture above.

Please keep me informed if you make any progress.

/Carl

[carljh]

Interesting, I got the exact same problem! You can check my post here: https://forum.beoworld.org/forums/topic/beolab-8000-turn-off-after-some-hours/

[carljh]

I made some more testing yesterday and realised that I connected the wrong pin in the DIN connector for the 5V power on activation signal. When the speaker get into the error stage after some hours it is possible to turn it on by 5V on pin 4 in the DIN connector. I assume this mean that the error is in the autostart circuit so I will look there, see attached picture I found in another post.

[carljh]

Many thanks for the advice, I will start to check the voltage levels on the PCU board.

[carljh]

Thanks for the feedback KolfMAKER, appreciate it a lot.

I am a little confused with the generation terminology. I got the impression that the first generation BL8000 with a 2,5 way speaker was called MK1 and then the upgraded bass 1999 called MK2 and finally the ABL 2003 called MK3 but I am not sure.

Anyhow, back to your questions:

• I got two speakers and one works perfect and one has this error.
• Smart proposal! I will check if I can feel any temperature difference this evening.
• I have removed the PCU/AMP module and the speaker got the newer white foam. It is possible that some changed this because I just bought the speakers and don’t know the history. I can’t see any foam remainings on the PCB, it look clean as new.

I have downloaded the circuit diagram and got a multimeter and soldering iron but don’t know where to start looking unfortunately. Any help is welcome.

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