Beogram 3000 5901, motorcontrol schematic

[on4dag]

Hello,

Has someone a schema of the motorcontrol unit on the PCB of the motor? I have taken the motor apart and it’s running, but the controller PCB has a problem. On the PCB IC808 (hall ic or PWM?), a thyristor, some capacitors and resistors.

 

I just want to see how this functions and if their are parts availbale. The IC808 search didn’t show something on google.

Thank you for help.

Kind regards, Erik

[on4dag]

Some photos of the situation.

 

 

[Mark-sf]

The motor was considered a single part so B&O did not publish the control-board schematic. What is the nature of the problem you are experiencing. Most of the time its the bearing drying out not an electronic issue.

[on4dag]

Hi Mark,

I had a blown fuse and only the motor module caused this.

I have tested the motor and it runned but with noise. Now I have re oiled the bearings but didn´t test the whole again. Can dry bearings cause an overcurrent to blow the fuse? If so, then I have to install it again and test it. What is your experience?

 

 

[on4dag]

I have reinstalled and motor is functioning!

Motor makes still some noise, from the brushes. So I have to look if these are still available.

 

[garncarz1988]

https://beomanuals.com/manuals/Beogram/Beogram%203000/

[on4dag]

Thanks all for your help.

 

I have a question on the main bearing (nylon fitting) but I will make a new topic / post

[Mark-sf]

You do not apply oil to the bearing. It needs to be infused in a vacuum. My experience is that they are still the source of your noise.

[on4dag]

Hi Mark,

thank you for your remark. I have seen some posts on this topc and I am thinking of doing this (“oil-vacuum”) as well. But first I had to check if the other parts were all doing well.

Thanks for your help.

[Author]

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