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Monday, June 25, 2018

Beogram 4002 (5513): Floating Suspension, Reservoir Capacitor & Platter Motor

This project is heading into the home stretch now. In this post I am showing the remounting of the floating chassis in the cabinet along with changing out the reservoir capacitor and installing the rebuilt platter motor.

Here are the components for mounting the floating suspension back in the cabinet.

The longer end of the threaded pin goes on the bottom. It is important to attach the wing-nut so that it is right at the start of the thread. I attach mine so there is enough thread in place to hold the nut and the outer part of the nut is flush with the top most thread. The idea here is to provide maximum space for the floating chassis when the the lock is disengaged. Turning the threaded pin will move the two lock nuts closer together (locking the suspension) or further apart (unlocking the suspension).

Because most of the Beogram 400x turntables have deteriorated transport lock bushings Beolover created replacements using 3D printing technology. Here are a set of the Beolover transport lock bushings for the three Beogram suspension mounts. There are a total of six 3D printed parts.

Now the rest of the suspension mount pieces can be attached. Just like the first wing-nut I started out with the top of the nut flush with the first thread.

The next re-installation in the cabinet is the reservoir capacitor.  The original reservoir capacitor is actually two in one. Not all Beogram 400x turntables have this same type of reservoir capacitor so make sure you check carefully and identify what your 400x type has.

I removed the wires and installed the Beolover replacement capacitor assembly.

It looks great. Now to install the platter motor that Beolover rebuilt for this project.

One more look over the reassembly so far shows everything looking good.

The next step is to work on the main board and the output board.

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