Hello, fellow B&O aficionados! And greetings from Stockholm, Sweden!
First post by a longtime lurker. I have just added a beautiful Beogram 4002 (Type 5511) to my small B&O collection. It works just fine after som CLA, thanks to the generous advice offered on this forum. The pickup is an MMC 5000.
The only problem is audible rumble noise (both mechanical, and through the loudspeakers) when the pickup arm motor adjusts the arm position.
If I press START<< with no record on the turntable, the pickup arm will "cycle" in 24 seconds, with the motor buzzing like an electric razor.
The voltages seem to be correct, with 5,5V for >, and 12V for >>.
I feel that I have done the obvious things: I have cleaned and greased the two rods and the long spindle, and put a drop of sewing machine oil on the spindle bearing and the nylon roller that rests on the rear rod. The spindle is parallel with the two rods. I have not replaced the spindle drive belt, but it looks fine and doesn't seem to slip at all. It's wedge shaped, and the sharper edge rests inside the V-shaped grooves on the pinions.
I have also taken the motor apart and cleaned the tiny electrical contacts inside and put a drop or two of oil on the front end of the shaft. The motor is labelled "Maxon DC motor 2023.913-11.111-002".
I have been in contact with Maxon, but they weren't able to suggest a suitable replacement. And according to my local B&O repair shop, spare parts are of course long gone.
Q 1: Any tips on fixing the pickup arm servo motor to be quiet?
Q 2: Has anyone found a suitable replacement for it?
Q 3: Has anyone got any useful information about this motor, so that I can search for a replacement?
My apologies if this has been covered before, but I haven't been able to find any details about this particular problem (apart from others suffering from it!).
Any advice greatly appreciated! /Folke
