Beogram 4004 (5525): Restoration of Arm Lowering and Tracking Mechanisms

As usual I started the restoration of this Beogram 4004 (5525) with the arm lowering mechanism and the tracking system. Here is a picture of the solenoid and the damper that control the arm lowering:

I removed the linkages and the damper for cleaning and lubrication:

This video shows how to rebuild the tone arm mechanism in detail. After putting everything back together I turned my attention to the linkage that connects the damper to the arm. For getting to this one has to take out the sensor arm> This shows the sensor arm from the back:

and after removal:

Then I removed the circlip and the spring that hold the linkage down and removed it:

This video shows how to get to the damper to arm linkage and re-lubricate it. After putting everything back together it was time to adjust the lateral parallelism of the arms:

Then I replaced the original tracking sensor light source with one of my SMD LED based replacements to ensure trouble free operation down the road. This shows the original fixture:

After taking off the light source assembly the tracking control aperture becomes visible:

Then I installed the replacement:

It has a potentiometer which allows easy fine tuning of the tracking feedback via changing the light intensity of the LED in the assembly. This part is available. Just send me an email or use the contact form on the side bar of the blog. There is a video that shows the tracking sensor adjustment procedure in detail. 

The next step was to exchange the wobbly original plastic pulley with a new aluminum pulley provided by Nick (I'll be happy to get you in touch with him if you need one!). This shows the original pulley:

And the new one:

Allright! All good again in the arm lowering and tracking departments!