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BeoLab 4000 mkII schematics

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This post has 9 Replies | 2 Followers

Retro-Repair / Richard
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Retro-Repair / Richard Posted: Tue, Oct 6 2020 8:23 AM

Dear all,

I have a pair BeoLab 4000 mkII speakers that have a problem. I downloaded the Service Manual but unfortunately no schematics, only a block diagram. Is there perhaps someone that can help me with the schematics of these BeoLab 4000 mkII speakers?

Thank you,

Richard

 

marexy
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marexy replied on Tue, Oct 6 2020 2:44 PM

Hi 

There is no service manual with shematics.

The same goes for BL4. 

What is the problem?

Tassos
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Tassos replied on Tue, Oct 6 2020 6:24 PM
retrorepair:

Dear all,

I have a pair BeoLab 4000 mkII speakers that have a problem. I downloaded the Service Manual but unfortunately no schematics, only a block diagram. Is there perhaps someone that can help me with the schematics of these BeoLab 4000 mkII speakers?

Thank you,

Richard

I have schematics but of mki, I think the only difference is that mkii has class d amps whereas mki has ab class. If you want I can send them to you via email
Dillen
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Dillen replied on Tue, Oct 6 2020 8:04 PM

MkI and MkII are far from identical. In fact they are quite different.

Martin

Retro-Repair / Richard
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Retro-Repair / Richard replied on Wed, Oct 7 2020 7:58 AM

Besides a small humming sound in both, one speaker makes a cracking noise...but not always. Sometimes it plays for minutes without any disturbances.

marexy
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marexy replied on Thu, Oct 8 2020 12:07 PM

May be bad solder joint or amplifier PCB.

Retro-Repair / Richard
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Retro-Repair / Richard replied on Sun, Oct 11 2020 5:25 PM

That solved it! A bad solder joint on the main PCB. Thanks a lot!

Regards,

Richard

Jekame
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Jekame replied on Wed, Feb 16 2022 5:51 PM

Ik heb hetzelfde probleem wat hoe zag het er uit de slechte soldeer verbinding ?

gr Jef

Retro-Repair / Richard
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Retro-Repair / Richard replied on Thu, Feb 17 2022 8:31 AM

Hallo Jef,

De slechte soldeerverbinding was optisch niet te onderscheiden van de goede soldeerverbindingen. Door met een multimeter diversen SMD weerstanden door te meten kwam ik toevallig op een weerstand waarvan de gemeten waarde behoorlijk afweek van de aangegeven waarde. Nadat de soldeerverbindingen opnieuw waren gedaan, gaf de weerstand de juiste waarde weer aan en was daarmee ook het probleem verholpen.

Groet,
Richard
Retro-Repair 

Jekame
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Jekame replied on Thu, Feb 17 2022 6:10 PM

dank voor je reactie en moeite 

 de aangegeven waarde heb je van de SMD zelf ?   of heb je een overzicht 

Veel vragen maar ik probeer een helder beeld te krijgen van waar te zoeken 

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