Taking into account the testing you have already done, then its going to be caused by either:-

• Interference from another electronic device.
• The BeoSound 9000 receiver has become faulty

matador43 wrote:

Hi Alls,

Since this morning, the IR sensibility of my BS9000 as decreased.
I Usually can point the remote in any direction, including all opposite to the unit and get perfect control.
Now I need to point the remote at the device for it to receive commands.

I've tried different remotes, cleaning glass and sensors but nothing works.

Is there something common and if so what is the cure?

 

Thanks all.

Depending on which MK version it is, the MK1 and some MK2's has the same problem as Beolink 7000/LC2, in that the 2 SMD caps in the receiver circuit, dies. It is an easy fix once the pcb is out of the unit.

Getting it out is a bit more troublesome, the easiest way, is to loosen the aluplate, and slide it 5 cm to the right, this gives access to the PCB ir. It is also possible to just loosen the plate, and lift it up in the left side, but be careful with the sledge wires and so on.

If I remember, you have had a unit completely disassembled, so you know the drill :)

But first try to relocate the unit, or make sure no light gets in that can interfere and so on. I have not seen the drop in IR sensibility, only that it is totally dead, so do a lot of testing before removing PCB and changing caps :)

/Weebyx

Keith Saunders wrote:

Interference from another electronic device.

Thank you Keith,

That was it!

For the record I didnt suspect this because the only changes around didnt have any IR receiver: a Beogram 5500 through an RIAA preamp and a passive source switch into the A.AUX port of the 9000. As soon as I disconnected it all it reverted to normal.

There is some magical mysteries into those things!

Weebyx wrote:

If I remember, you have had a unit completely disassembled, so you know the drill :)

Thank you too Weebyx,

You remember well. Now I must say I rather not to do it ever again.

Thank you both for your help.

matador43 wrote:

Keith Saunders wrote:

Interference from another electronic device.

Thank you Keith,

That was it!

For the record I didnt suspect this because the only changes around didnt have any IR receiver: a Beogram 5500 through an RIAA preamp and a passive source switch into the A.AUX port of the 9000. As soon as I disconnected it all it reverted to normal.

There is some magical mysteries into those things!

Wow, that was strange ?

A.AUX on pin 6/7 seem to have AudioLink connected to the cpu, in the MK3 it shows as disconnected, but maybe it is connected on earlier versions.

Does your DIN connector have the pin 6/7, or is it a straight L/R/GND 5 wire connector ?

/Weebyx

Weebyx wrote:

Does your DIN connector have the pin 6/7, or is it a straight L/R/GND 5 wire connector ?

On the A.Aux socket of the Beosound 9000 there is a DIY 4 RCA to DIN plug that came with my Beomaster 1001.
Then all is RCA - RCA through the two devices (switch and RIAA preamp) and finally DIY RCA to female DIN in which the beogram (5 pins) is connected.

Honestly I didn't try to connect/disconnect each stage one by one to find the culprit: as the RIAA preamp introduced a muffled channel and the loss of sensibility of the 9000 IR was a real concern, I just took it all of.

But appart of the Beogram, I also have a Beocord 5000, through the same RCA to female DIN and same passive source switch and it dont interfere with the IR beam.
I know nothing about interference but it seems to come from the RIAA preamp or its separate PSU.