Hi everyone,

Sorry to resurrect an old thread here, but I think it is worthwhile since my problem is so similar. 

My Beosound 9000 has a solid red light, doesn't respond to any button presses or remote commands apart from eject, which does open the glass lid (and yes I've shorted the correct pins in the speaker connectors).

After reading Henryk's experiences here, I checked out TR17 - sure enough it was dead. I replaced it and powered up - i briefly heard the relay click, and then a high pitched rising whine sound. The relay clicked off again and the new transistor i had soldered in at TR17 was dead.

From looking at the schematic, I can only assume that IC7 - a 4094B is faulty and drawing too much power, though i cannot find any obvious shorts on the line. I also cannot find any replacements for this chip, apart from one listing on ebay from china (2 month delivery). I have checked C47 and R82, no shorts or problems there.

Can anyone lend me their wisdom? 

Many thanks,

P

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Hi,

The TR17 power up RL1 only. If it got burned straight away maybe there is an issue with that relay itself?

If you see red LED on it means you have 5V in the system. When relay switched then output of T1 changed its voltage to higher one (ff I remember correctly). Maybe this pushed 5V domain to higher level and that in turns burned TR17?

Power supply for Beosound 9000 is quite tricky. Be patience with it. It operates differently in standby and differently in normal operation mode. For now focus on components around transformant and D1 rectifier.

BTW, PSU will not start without 100Hz from mains. Also you have to have glass panel in place and do not block IR beam if you want to check operation of the unit.

Regarding 4094B. I think this suspicion might be a bit premature. If you still think that this IC is faulty you can by one from any electronic shops for few cents: link For now though, focus on power supply itself. Maybe start from examining main components and the try to see if voltages are right with new TR17 but most of the circuitry disabled from PSU board.

Cheers,

Henryk

Thanks a lot for your reply and help mate.

I can't imagine how a relay would burn it up? It's not like it can draw too much current, just open or closed right? Unless you're suggesting the 5V line could be shorted to a higher voltage line?

I actually didn't realise you need the glass in place for operation, the manual suggests just having the hinge in the 'upright' position is enough. Where is the IR beam exactly?

I will hold off on ordering a replacement 4094B based on your suggestions! Unfortunately the one you have linked is the one i ordered, which, while being the correct chip, is the wrong shape and structure. The one in this ebay link is the only one i've found which matches the one in the B&O - 

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Hi,

You are correct with your assumption. Relay transistor can be burned in case when there is a short in the relay (unlikely) or voltage that is applied to the relay is too high (probably).

Follow Beobuddy suggestion (earlier in this tread) and first remove ribbon cables (that power other blocks) from the power supply unit. That way potentially you can limit collateral damage.

Then install new transistor and try to power up unit again. This time though power it thru old school light bulb in series on the mains side. Basically something like that: link

For unit that is fine you should see bulb lights up during start up and then light will go away when current draw is small. If there is an issue with your unit (which we suspect it is), light most likely will light up and stay on. This should prevent relay transistor from burring up again and might give you chance to check voltages after transformer. They will be lower compare to operation without light bulb and they should be lower (if there is an issue with power supply) compare to schematic numbers due to light bulb on the primary side of transformer. If relay stays on, using voltmeter go around board checking voltages. Looks for animalities at the regulator outputs.

Focus on power supply first. Once you figure out what is wrong with it, you can move to other blocks and then having glass panel on or remembering about hinges up is important. IR beam is in front of CD compartment (two glass-like triangles in the corner of CD compartment).

Yes, hold of will replacements for now. You might ended up with longer shopping list than just 4094B.

Good luck,

Henryk

Thanks a lot for this, I'm afraid I am no further forward.

I changed the transistor and powered it up using the lightbulb method you laid out. The lightbulb behaved normally and went down again after the unit started up. The relay transistor seems fine now, I have started it without the lightbulb connected and the transistor seems fine - perhaps the first replacement i got was faulty. 

I have my 5v and 12v lines, yet the device does nothing. I've tried operating it with the glass lid installed, and i've shorted the pins in the DIN sockets too. All that happens is the red light flashes for a moment and then goes solid red, after about 30 seconds the relay clicks and i stop reading 5vac on TR17 and instead read 5vdc. The eject button works in that it lifts the glass lid. If i free up the sledge's movement using the gear underneath it - it goes rigid again once power flows, so it's doing something there. While on, the relay clicks every minute or so and the unit sort of 'resets', going breifly back to the flashing red light and the sledge moving a tiny bit.

Nothing comes up on screen, remote buttons do nothing, buttons on device do nothing aside from Eject.  

Would really appreciate any help anyone can give. I've tried following the flow chart in the B&O manual, but my problem doesn't seem to be covered by it - it seems to assume that if one has a red light they will also have display.

Thanks again.

Hi to all,

I´ve suffered from the same problem in last week, Stand by issue take control of my BS9000 MK3, after some tries to figure out the problem i´ve come here and found this Post. I´m a sound technician and not from electronic even had any formation in this area, so this post "saved my life"  😁, first i´ve measured the 2 fuses on PCB34 and they were OK, so i gone forward to TR17, it was painful to me to get the PCB out to be true, behind a dinner table with my two very young kids always taking my attention (I took advantage that my wife gone to hairdresser and i don´t hear "again around and fixing B&O old stuff"), with Board off i saw that the transistor is bellow a processor (i´ve looked dozen of times to Schematic and never noticed that to be true), with Processor out i´ve measure the transistor with multimeter and seems all has it should, but after all that work i´ve insisted to substitute anyway, result... my BS9000 is back on life!!

Two reasons to come here again. First of all to thank to Henryk from sharing is knowledge! Many Thanks, really! Second reason, to talk a little about the pre-symptoms of the Player:

• First alarm it was 2 weeks ago, after about 6hrs playing when i was to shut him off he didn´t answer to any command, Door, Keyboard, CD change or Beo4, so, i had to turn off in main power, when turned on after 1 minute he stayed in stand by, then i turn off again from main power and turned on in day after, it worked.
• Last week, the same thing, after 6 or 7 hours playing, then turned off on main power again, same thing, after some minutes i´ve turned on and "stan by issue", i´ve wait till the next day and he never wake up again.
• after that, some times he light the stand by led, other times no (70%).
• I got BL8000 connected, always he turn on the BL8000
• All times he turn on the laser len light, i can see it between glass door and equipment

Thanks once again

Hugo

Thanks a lot for sharing your experience Hugo!

I'm afraid I am no further forward with mine. Does anyone have any ideas of what I could check next? Symptoms are... 

Red light, but not turning on - have replaced TR17 twice. 

Thanks a lot in advance.

Thanks a lot for sharing Hugo!

I still haven't gotten there with mine :(. 

Can anyone help?

Symptoms are - Red Light, no power beyond that, except that eject button DOES open glass lid. I've replaced TR17 twice, to no avail.

Thanks so much in advance.

Sorry to read that!
You could have a bigger problem, maybe the Main MicroComputer is faulty (8000513) 🙁. If you have access to some official B&O service they probably and easily can check that possibility.

Hope to hear some good news from your BS9000 soon!

Regards

Hi,

Hugo,

Great to hear that this forum helped you but I can’t take all the credit. We both got there thanks to comments left by other people. It is perfect example of team work in action. I hope your wife and kids appreciate BS9000 working again :)

passmore,

Sorry to hear that you are still far from getting BeoSound up and running.

To be honest my knowledge about fixing such unit is limited to just one that I worked on. I’m sure there are people there with much more expertise. With that in mind, I can offer few more suggestions from my side:

-          Check and confirm all voltages in power supply unit. Compare numbers to the schematic  one and make sure they do match.

-          Make sure that unit you have is for correct region. Its PSU expects 100Hz for regions where mains are 50Hz and 120Hz for regions where mains are 60Hz

-          Try 9000 with sledge motor driver PCB disconnected from PSU board. Maybe issue is with motor bridge transistors or some control circuitry around them? Maybe this is the reason why unit resets itself after ~30 seconds?

-          Follow Hugo suggestion. If I’m not mistaking it is possible to start 9000 without firmware EEPROM installed. If this is the case, maybe try it? Pull out EEPROM and try to start the unit without it. Maybe this will make some difference to the overall operation and that way point you to faulty firmware EEPROM IC or its content.

-          There are people on eBay who offer service of BS9000. It is costly and it is basically giving up on your side but it is another option I guess.

That is all that comes to my mind I’m afraid.

Good luck,

Henryk