Beosound 9000 MK1 no standby led/like dead

in BeoSound · Mar 26, 2024 10:57 GMT

I continue my monologue :D a new CPU is on the way. In the meantime I checked the PROM of the code and it seems intact.

Beomaster 901 stereo light not working - FIXED was weak FM aerial signal

in BeoMaster · Mar 26, 2024 10:55 GMT

oups wrong topic.

Beomaster 901 stereo light not working - FIXED was weak FM aerial signal

in BeoMaster · Mar 26, 2024 10:53 GMT

when TR10 is removed and you are sure to receive stereo signal, what is the B-E voltage?

Beomaster 901 stereo light not working - FIXED was weak FM aerial signal

in BeoMaster · Mar 24, 2024 21:58 GMT

Ok and 2C56 capacitor was originally a tantalum one? What was the original TR10 reference?

Beomaster 901 stereo light not working - FIXED was weak FM aerial signal

in BeoMaster · Mar 24, 2024 19:33 GMT

if you have 0v at the base then the light is not turned on. have you tried to remove the transistor and measure the base voltage again (to see if the transistor is not base/emitter shorted) you can even measure 2C56 is t…

Beosound 9000 MK1 no standby led/like dead

in BeoSound · Mar 24, 2024 18:10 GMT

and if you never seen what's inside a beosound 9000 CPU box, here is the answer ;) (removing the pins is not easy, the pads are very fragile) (sorry I can't remove the second attachement ^ ^)

Beosound 9000 MK1 no standby led/like dead

in BeoSound · Mar 24, 2024 18:05 GMT

I was wrong, the 30h I2C call is made by the link processor to the main processor. after more analysis, it's the main processor the problem. the CPU seem to be dead. no memory access (ram/prom etc) only the oscillator is…

Beosound 9000 MK1 no standby led/like dead

in BeoSound · Mar 22, 2024 08:50 GMT

Hello everybody :) I just bought a faulty Beosound 9000 and I am trying to repair it. but i need help to understand how the beosound 9000 starts on power on. Does it move the clamp or do something before turning on the s…