Dear all,

I've been looking at B&O stuff for almost 20 years and I've decided to make the step and buy a complete set. Ok it was out of order but as I'm repairing electronic devices for almost 30 years I've make the deal.

Beolab 8000 were having common problem with the foam and also the problem with the copper no-contact on the power supply PCB (rusted by the wet foam).

Anyway, the Beosound 9000 were not functioning at all. The good point is that it is a MK1 retrofitted with MK3 head. With Beo4 I've checked the error list. With that I manage to repair the IR circuitry (SLG ERR42), have done the calibration and now I can play a CD and it's great... But the sledge refuse to move (It is alive because at the startup it moves from millimeters to find CD1). When I check the error list I have the SLG ERR31.

So I start to dig... The sensor were pretty nasty so I've change the optical sensor but no change. I've made a long cable between the PCB18 and the optical sensor so I can test with my scope easily. I'm lost because I've the correct signals on the input of the processor (after IC9/IC11) and also checked the IC3 and the clock on the IC4. Everything seems correct, I've a switch between 0 and 5v when I click on CD2 and after it tilt to standby mode.

My questions : 

1/ I've remarked that the wheel on the motor is not solid attached and it can move for 1-2° (not loose)

2/ Does the ERR SLG31 mean another thing ?? Regarding the service manual it says that the microprocessor cannot sense puls from PE1... Witch I have...

3/ I've a extra motor PCB but not a PCB18, a PCB35 from a MK3. Regardless the connector witch can be easily purchase, will that works with a mk1 motherboard ?

4/ Maybe a clue... When I disengaged the sledge and put it on CD2 for exemple, when I start the B9000 it goes very quickly to the right and knock the aluminium... Hall effect sensor pb ?

THANKS for reading ... And in advance for your help... I've spent hours and hours on it and I don't know where to search.

Olivier