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Hi - I have a strange problem on my BS9000. It functions perfectly fine but about two days ago, the power and aux buttons on the control panel stopped working. All the rest of the buttons do work (radio, timer, etc.) and the CD player itself is functioning fine. I have disconnected the CD player from the power supply several times and it has not helped. I have reseated (and even flipped upside down) the control panel and this has not helped either. My father in-law says that there was an audible noise (static discharge?) when he tried to push the power button two days ago and after that it stopped working. I'm guessing some electronic component within the control panel is blown? Can I just replace it with another control panel and it'll work?
Thanks in advance for all your help!
Hi ciotera
Are you sure ALL of the other buttons work? Specifically you need to check the 'PAUSE', 'TUNE', and 'RADIO DOWN ARROW' buttons as they share the same line as the 'STANDBY' and 'AUX' buttons according to the diagram below (from the mk3 service manual).
If these buttons still work, I would be fairly confident that replacing the keyboard would resolve the issue, but if these three buttons also do not work it is more difficult to say whether the problem lies within the keyboard or within the BS9000 itself.
If you can check these first and let me know the outcome and I will see if I can narrow things down from there.
Kind Regards,
Martin.
Hi, Martin-
Thanks for the quick reply! You are absolutely right, PAUSE, TUNE, RADIO DOWN also do not work. How can we track down to whether it's the keyboard or the player that's at fault?
Ok, so looking at the diagram, what all these buttons have in common is that they are connected to the line marked 'P81-2'.
First thing to check: please remove the keyboard from the BS9000 and have a look at the soft silicone rubber type strip inside the keyboard recess (left hand end if you have the BS9000 mounted horizontally) - this is what the contacts on the rear of the keyboard make contact with. Check whether there are any visible signs of damage or a buildup of dirt or debris which might be preventing the keyboard from making good electrical contact.
Likewise, please check the contacts on the back of the keyboard (although I think it is unlikely to be these as you said you had tried flipping the keyboard upside down which would use the other set of contacts)
Do you have access to any sort of multimeter or continuity tester?
Thanks.
I have tested with the remote and the aux and standby functions work, so it's definitely the keyboard or its connection to BS9000, most likely the latter because, as you point out, flipping the keyboard doesn't seem to matter.
Unfortunately, I do not have access to any equipment to do anything sophisticated. I've cleaned up the connection (little rubber strip) but it didn't help.
Do you know anyone else local to you with a BS9000? - if you could try your keyboard on another machine it would determine whether it is the keyboard that is at fault or the main unit.
From looking at the circuit diagram, if it is not the keyboard it will almost certainly be either the contact rubber (part no 3333021) or PCB13 (part no 8005313) at fault.
I wouldn't expect either of these parts to be particularly expensive as there is not much to them, although obviously there will be a certain amount of workshop time involved in dismantling the BS9000 to replace these parts. PCB13 would also be pretty simple to repair if necessary as you are only looking at 1 resistor and 1 decoder IC (total component cost less than 1USD) that could be causing this fault.
Hope this helps, please let me know how you get on.
Thank you, Martin! You have been extremely helpful!
I'll try to find someone with a BS9000 to test my keyboard.
Where do you live ?
New York City