My restoration of the Beogram 4002 (5523) began, as always, with the arm lowering mechanism. The lubricants in these mechanisms often harden with age, preventing the tonearm from lowering correctly. The mechanism is shown here in its original condition:

Each moving part was removed

for cleaning and re-lubrication before reassembly. Next, I lubricated the damper-to-arm linkage pivot point. This required removing the sensor arm, as pictured below from the back:

The sensor arm assembly could then be removed by extracting two screws at its base:

Once the retaining clip on the pivot shaft was removed (being careful not to lose the small spring underneath!), I was able to remove the linkage:

Following cleaning and lubrication, I reinstalled the assembly and adjusted the arm’s parallelism:

The next task was replacing the tracking sensor’s light bulb with an LED assembly. The original tracking sensor light source is shown here:

With the light source removed, you can see the aperture that relays information about the tonearm’s angle relative to the carriage travel axis to the photoresistors in the base:

The original bulb fixture is pictured here alongside the LED replacement:

Like all of the Beolover parts shown on this blog, this assembly is available to other enthusiasts. Interested individuals can contact me by email or through the contact form to the right. This is the installed LED:

I was pleased to find that this Beogram 4002 had a metal, rather than plastic, carriage pulley. The latter is prone to cracking.