Beosound 9000 MK2 does not react on any button

[69er]

Hi guys – merry christmas to You all.

 

Using some freetime i want  to make one Beosound 9000 Mk2 coming back to real life again.

Behaviour: When connected to AC, red light comes up. No reaction on any button, neither the lid opnener, nor the CD, nor any of the ones in the door.

 

BUT: When using a Beo 4 it plays radio, i can change volume, jump top the CDs, play them.

So i run TM 27 and sometimes i got errors in ML ERR32, CD Err 2, IIC Error 104, SLC Error 42, APS Error 14 and 15. PWR Error 20.  As tehre are some old ones in the cache  – after deleting the errors, only the CD Err the pwr err and the slc err comes up again.

TM71 ran perfectly.

 

As everything else is working fine – is there maybe just a cable which is disconnected (all buttons to the PCB or so?

 

Best regards and enjoy your holidays

69er

[billbriscoe]

I had a similar problem on one of my BS9000s and it turned out that the cable from the keyboard had come loose at the PCB connector (PCB 3, connector P13) or it might have been P71 on PCB13 (secondary keyboard) but I think it was P13 on PCB3.

Good luck,

Bill

[69er]

Hi Bill,

thank You for your hint.

unfortunately it isn’t that easy. I was hoping for a quick win.
i checked mentioned cables and now I am one step worse.

still no button response and now

only radio is working.

Tm27 does show the slc err, but in tm71 the whole unit shuts down after opening and closing the door.

Before my opening, tm71 was running quite good. what did I made wrong?

best regards

69er

[69er]

Update

 

you need to put the glass on.

now tm71 runs through and states ok.

i can now play radio and cds with the remote.

 

buttons still dead

 

best regards

69er

[matador]

Are you sure the keyboard is correctly installed? Sometimesput it can look like ok but it is only hold by the magnets and not correctly put.

If correctly installed, maybe you could try to clean the contacts on both sides, or see if any key is stuck?

[69er]

Really curious – never saw this behavior before.

i could live without the keyboard, but always opening the lid by hand (against the spring) doesn’t make fun.

 

what I also don’t understand. Why both sides don’t work, assuming they are not connected via one cable

69er

[69er]

So, I dismantled close to everything. What a mess.

followed the cable from the lid opening and cd buttons to the respective pcb.

attached and loosened it all several times.

assembled everything together and …

 

 

 

 

 

 

 

 

… nothing. No change. This beosound currently just wants to be controlled remotely.

 

Doesn’t want to be touched directly ?

 

i think now, I need a replacement pcb, just don’t know which one.

 

i think I checked all TMs

 

best regards

 

69er

[69er]

Am I really the only one who has/had this issue?

best regards

69er

[Mark-sf]

I would focus on the Primary Keyboard and put a scope P72 or P12 connector and check that the signal correct routing occurs when each button is pressed.

[Beobuddy]

I happens sometimes. Not often.

It then happens that one of the ic’s on the board underneath the cover has died.
Replace the PCB or just the defective ic.

[69er]

@Mark-fs: what does put a scope mean?

@Beobuddy: which IC should I look first?

 

i don’t have an oscilloscope.

 

thank you all for your help

 

69er

[Mark-sf]

69er wrote:

@Mark-fs: what does put a scope mean?

Scope means oscilloscope. Since the remote is working, likely the CPU is fine. The keyboard interfaces with the CPU with a decoder/demux chip using 5v logic. Since you don’t have a scope, I would disconnect the keyboard and check for switch continuity between the matrix of connections on P72 as well as its soldered connections.

[69er]

Hi Mark-fs,

thank You for the hint – i will do so.

What i am wondering, that both (the cd allocaton buttons plus the door opener button) and the main keyboard are not working. Arent these two seperate cables, or do they connect to the same IC and PCB?

Best regards

69er

[Mark-sf]

The Primary and Secondary keyboards use the same logic through different decoder ICs and connect to the CPU. You should perform the same test with the P81 connector of the Secondary keyboard as that has the door control buttons. The Primary has the direct CD access buttons which I assume is what you meant by “cd allocation buttons”.

[billbriscoe]

I believe that what you are describing as the cd allocation buttons and the door opener are in fact the primary keyboard (there is a left and and a right) and these are PCBs 11 and 12. PCB13 is the secondary keyboard (volume, bass, treble, tuning, etc). B&O has referred to the secondary keyboard as the close up operation panel in some of the user reference materials. Both the primary and secondary keyboards plug into PCB3, the main microcomputer and power supply.

Have you double checked to make sure that the secondary keyboard has been properly attached and seated? It might be a good idea to remove it and try reseating it again (connector plug first) and maybe even try it in both orientations?

[69er]

I checked the secondary keyboard several times (as i had the issue of not sitting correctly with another BS9000). Bu – no – it wasn´t that.

Now i am somehow guessing (after trying to understand the circuit) that the IC14 on PCB32 (74HC138) could be a candidate. I ordered one and will try to exchange that one. Somehow everything around keyboard one and two goes through that IC.

Am i totally wrong?

 

Best regards+

69er

[Author]

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