Faulty Beosound 3000 – Can it be brought back to life?

[matador]

Sorry to say , and I “might” be wrong, but the answer is – NO –

BS3000 Small clamper are well know for “fried IC” issu.

I Believe there is a solution, involving buying new, custom made IC’s but I think it not worth the hassle.

I Sympathized (got one too that made a very good facia for a cheap and aesthethicaly wasted BS2300.

Regards

Location: Paris France

[dudu_mec]

Hi Matador,

That’s unfortunate to hear. So I might have a glorified paperweight or a potential parts donor.

Some questions are still brewing in my mind:

• Is the small clamper more prone to frying ICs than the large clamper? and why? Thought the differences circuitry were not that big. At least on the preamp board which seems to be the same in Ouverture/3000 and 3200
• From looking into the service manual I’m pointing at IC1, IC2 and IC4 in the preamp board. Apart from IC4 which I could not find new, only NOS replacements, the others are still available.
  • IC1 – CD4052
  • IC2 – CD4094
  • IC4 – TDA7318D
• You talk about custom made ICs. How is that possible?

 

[jacek1313]

Hello, have you tried giving a “fingertip” signal to R93 and R91? Maybe you have the TR42, TR64, TR60-64 transistors driven, i.e. the MUTE signal from IC1?

[dudu_mec]

jacek1313 wrote:

Hello, have you tried giving a “fingertip” signal to R93 and R91? Maybe you have the TR42, TR64, TR60-64 transistors driven, i.e. the MUTE signal from IC1?

That’s actually a good point. It can also be the mute circuit.

What’s a fingertip signal?

applying a signal to one or the other resistor, thus bypassing the TDA?  That way if I have sound then it’s not the mute circuit. If I continue without sound it can be the mute circuit or the ICs.

but does the mute also apply to the masterlink output? Currently I also don’t have output there

cheers

[jacek1313]

Masterlink comes from PCB12 IC4 (7,17) through PCB14 IC1-4 and IC8-9 (CD4066), so if there is no signal then PCB12 IC4 does not work or the AF or CD signal (12,13,8,9) does not reach it ). For tests, with the RADIO turned on, I would short input 12 (AF L) with output 25 through a 1kohm resistor. I think you checked all the power supplies, because there are quite a few of them.
Finger signal – you hold the screwdriver by the metal part and touch the elements, a sound should appear.

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