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Schematic for ICEsystem from Beolab 7-4 wanted

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W.Frankenberg
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W.Frankenberg posted on Wed, Oct 16 2019 7:51 AM

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

wilfried

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

I think there is no shematics ..

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

 

W.Frankenberg
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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?

wilfried

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

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

 

leosgonewild
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It’s a *** to take apart the components. What are you repairing on it?
W.Frankenberg
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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)

wilfried

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

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

are you 100% that tweeter is ok ?

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

 

W.Frankenberg
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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.

wilfried

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

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.

 

 

W.Frankenberg
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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

wilfried

leosgonewild
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Tell me if you need a new 7.4

I have one extra.
W.Frankenberg
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I send you an email

leosgonewild:
Tell me if you need a new 7.4

 

I have one extra.

 

wilfried

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