Beocenter 3500 issue

7 replies
MA
Offline
Martin@WAVS
Bronze
Posted March 21, 2024 at 11:58 GMT
#1643456
Hi all,

This is driving me mad.

I have a B&O Beocenter 3500 in for repair.
The lift/start/stop mech just doesn’t work, it has a thin metal lever arm which has many bends and twists in it, which engages the cam which in turn moves the tone arm. None of this is happening. I have a service manual that doesn’t help, I can’t find any photos on the internet showing the mechanism.
Don’t know If anyone has any experience with this unit.

Regards,
Martin
Ninni
Offline
Ninni
Bronze
Posted March 29, 2024 at 20:07 GMT
#1663671
A difficulty with this mecanism is that you can't normallly watch it operate, as it's on the underside of the deck.
You say nothing happens. Have you tried pressing the button gently and keeping it depressed for a second or so?
Does the platter start spinning when you press the button?
DI
Offline
Dillen
BronzeModeratorFounder
Posted March 30, 2024 at 06:41 GMT
#1663683
I have seen cases, where too much friction between the metal arm on the microswitch and the actuator arm that rubs against it inside the contact housing kept it from activating.
Clean the parts and add a little teflon oil to lower the friction.

And, as mentioned above, the deck will not work correctly upside down, which makes
it a little tricky to diagnose and test.

Martin
MA
Offline
Martin@WAVS
Bronze
Posted March 30, 2024 at 11:30 GMT
#1663692
Thank you for both replies.

The unit does nothing is to press the button, whether it's a short or long press.

The unit will work if move the lever to engage the motor switch, so the turntable rotates fine and the tone arm will drop. But when it returns to it's rest position, you can't restart it.

Regards,

Martin
Ninni
Offline
Ninni
Bronze
Posted March 31, 2024 at 17:45 GMT
#1663743
So the problem is that it doesn't activate the switch, to start the motor.
DI
Offline
Dillen
BronzeModeratorFounder
Posted March 31, 2024 at 19:34 GMT
#1663748
Did you try what I suggested?

Martin
MA
Offline
Martin@WAVS
Bronze
Posted April 2, 2024 at 11:08 GMT
#1663815
Again thank you for the replies.

The auto playing doesn't do anything, no rotation, nothing.

The manual setting will will rotate the turntable but the lifter does nothing, so the tone arm doesn't lower on to the record.

I have cleaned the and added a very small amount of silicon grease to the plastic housing but made on difference.

Regards,

Martin
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