Schematic for ICEsystem from Beolab 7-4 wanted

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W.Frankenberg / Gandalf Posted: Wed, Oct 16 2019 7:51 AM

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hello, is there anyone who has a schematics of the built in BL 7-4 ICE system (ICE250)?

there is only a block diagram and a wire diagram in the service manual.

As a spare part, this board is not listed.

Best regards

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marexy replied on Wed, Oct 16 2019 9:10 AM

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I think there is no shematics ..

or ..maybe there is but not for public :(

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W.Frankenberg / Gandalf replied on Wed, Oct 16 2019 10:00 AM

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oh, that would be a pity.
is there no B & O technician who has ever repaired these boxes and has a copy of the schematics?

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marexy replied on Wed, Oct 16 2019 12:05 PM

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there is ..but if you know electronic ..go step by step..it can be repaired in component level.

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W.Frankenberg / Gandalf replied on Wed, Oct 16 2019 12:47 PM

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I'm searching for an error in tweeter connection, the tweeter is ok, but I hear no sound (except the bass)

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marexy replied on Wed, Oct 16 2019 12:57 PM

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so no soud from tweeter ..zerro..zilch ?

are you 100% that tweeter is ok ?

if so ..check mosfets and resistrors ..ect..

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W.Frankenberg / Gandalf replied on Wed, Oct 16 2019 1:11 PM

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marexy:

are you 100% that tweeter is ok ?

if so ..check mosfets and resistrors ..ect..

 

I'm not 100% sure that the tweeter is ok,

have another tweeter (4 ohms) connected, it comes out no sound.

When I short the tweeter I hear the woofer.

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marexy replied on Wed, Oct 16 2019 1:28 PM

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I am not sure that tweeter 4 ohm is ok.  if it is same as geleraly most of B&O..than is 6 to 7 ohm.

What do you mean short...hope you are not shorten + and -  on tweeter cable.

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W.Frankenberg / Gandalf replied on Wed, Oct 16 2019 4:21 PM

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marexy:

...

What do you mean short...hope you are not shorten + and -  on tweeter cable.

..

I'm afraid the original tweeter has already done that, it has only about 1 ohm resistance (short circuit!).
Anyway, with this tweeter the bass woofer is active,
only high notes do not come from the tweeter

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W.Frankenberg / Gandalf replied on Thu, Oct 17 2019 9:26 AM

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I send you an email

leosgonewild:

Tell me if you need a new 7.4

 

I have one extra.