Beogram 4002 (5523): Restoration of the Arm Lowering and Tracking Systems

As usual I began the restoration of the Beogram 4002 (5523) that recently arrived at my bench with the restoration of the arm lowering mechanism. At this age the lubricants are often hardened and the tonearm does not lower anymore reliably. This shows the mechanism before I took it apart:

I removed all moving parts

and cleaned them before I re-lubricated and installed everything again. The next step was to lubricate the damper-to-arm linkage pivot point. This requires to remove the sensor arm. This picture shows the arms from the back of the deck:

Removal of two screws at the base allows taking the sensor arm assembly out:

After carefully removing the retaining clip on the pivot shaft (and not loosing the small spring that sits underneath...;-) the linkage can be removed:

After cleaning and re-lubricating I installed the assembly again and adjusted the arm parallelism:

The next step was to replace the tracking sensor light bulb with a LED based assembly. This shows the original tracking sensor light source in place:

Removal reveals the aperture that informs the photo resistors in the base of the tracking sensor about the tonearm angle relative to the carriage travel axis:

This shows the original bulb fixture in comparison with the LED based replacement:

Like all Beolover parts featured on the blog this assembly is available to other enthusiasts. Just send me an email or use the contact form to the right if you are interested. This is how it looks after installation:

It is nice to see that this Beogram 4002 already came with a metal carriage pulley instead of the usual (cracked) plastic pulley.