BeoLab 4000 mkII schematics

10 replies
RE
retrorepair
Bronze
5 posts
Posted October 6, 2020 at 08:23 GMT
#2144890

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

 

Location: Maastricht, Netherlands

MA
marexy
Silver
785 posts
Posted October 6, 2020 at 14:44 GMT
#2144891

Hi 

There is no service manual with shematics.

The same goes for BL4. 

What is the problem?

AK
akoitidis
Bronze
364 posts
Posted October 6, 2020 at 18:24 GMT
#2144892
retrorepair wrote:

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
DI
Dillen
BronzeModeratorFounder
12777 posts
Posted October 6, 2020 at 20:04 GMT
#2144893

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

Martin

RE
retrorepair
Bronze
5 posts
Posted October 7, 2020 at 07:58 GMT
#2144894

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

Location: Maastricht, Netherlands

MA
marexy
Silver
785 posts
Posted October 8, 2020 at 12:07 GMT
#2144895

May be bad solder joint or amplifier PCB.

RE
retrorepair
Bronze
5 posts
Posted October 11, 2020 at 17:25 GMT
#2144896

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

Regards,

Richard

Location: Maastricht, Netherlands

J(
Jekame (archived2)
Bronze
5 posts
Posted February 16, 2022 at 17:51 GMT
#2144897

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

gr Jef

RE
retrorepair
Bronze
5 posts
Posted February 17, 2022 at 08:31 GMT
#2144898

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 

Location: Maastricht, Netherlands

J(
Jekame (archived2)
Bronze
5 posts
Posted February 17, 2022 at 18:10 GMT
#2144899

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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