Beogram 4002 Type 5513: Inside Work

The restoration of the Beogram 4002 from Houston continues as I worked on the inside of the turntable. In this post I worked on the tangential arm assembly components and the Beogram reservoir capacitor replacement.

Here is an updated photo of this Beogram 4002 with its chassis and tangential arm assembly removed.

The tangential arm assembly components on this Beogram 4002 are in excellent shape.  Most of my tasks were just cleaning and lubrication the Beogram chassis parts. In the photo above you can see the arm lowering damper removed and disassembled. The parts were nice and clean but the lubrication fluid for the damper was gone. I applied a fresh coat of PMX-200 silicone fluid per the service manual. The tangential drive spindle was also cleaned and lubricated along with the nylon nut (that drives the arm assembly). The tangential arm assembly tracking components were checked and all looked to be in great shape.

Two components I did change out were the tangential arm assembly position sensor lamp and the tangential drive pulley.

I replaced the old plastic pulley with a new aluminum one.

Just for reference here is a photo of the underneath side of the Beogram 4002 tangential arm assembly carriage. It isn't seen very often in restoration photos but is a good thing to examine.
The thin wires from the phono cartridge come out of the base of the tonearm pivot and connect to a transfer board. From there they are picked up by a larger, shielded cable that takes the audio signals over to the audio muting circuit just prior to exiting the Beogram (to a preamplifier).

....and finally here is a photo of the new Beogram 4002 reservoir capacitors. As usual I installed the nice Beolover replacement capacitor assembly.

There were no surprises with this Beogram 4002 turntable and these components are now ready to be reassembled back in the Beogram cabinet.

Beogram 4002 Type 5513: Floating Chassis

This will be a quick and short post just to show an interesting change in the Beogram 4002 Type 5513 suspension mechanics.

In the previous Beogram 4002 Type 5513 project the floating suspension lockdown mechanism was like this -

Bang & Olufsen used some stacked concave washers between the suspension lock and the top plate (removed in this photo). There were also a couple of the washers on the bottom lock. The above Beogram 4002 was serial number 1312615.

This current project Beogram 4002 Type 5513 unit has a suspension mechanism like this -

Its serial number is 1311076. A slightly earlier production of this Type 5513 turntable.  When it was produced Bang & Olufsen was using a single, concave piece of metal between the suspension lock and the top plate. There is also one on the bottom lock. No big deal really but little differences to take note of when you are restoring various Beogram turntable types.

Here is another "interesting" thing ;-)...
The plastic suspension lock bushings in this current Beogram are still pliable and intact. Yet this turntable is older than the first one where the bushings crumbled when touched.

I broke out the Meguiar's Vinyl & Rubber Cleaner/Conditioner #40 and soaked the three sets of bushings. It appears they can be saved.

Here are a couple more pictures of the lock down mechanics of this Beogram.

The lock down screws will be cleaned and oiled so they perform like new again.

Two other things that caught my eye were some corrosion spots on the floating suspension leaf springs and the noticeable missing eccentric cabinet guide washers. I did find some broken plastic remnants of the original cabinet guide washers. That is another Bang & Olufsen Beogram 4002 change. In the newer serial number 1312615 unit the guide washers are metal, as are the guide washers in the Beogram 4004 models.

I will clean up the corrosion on the leaf springs and the eccentric cabinet washers (there are five of them) will be replaced using Beolover's 3D printed replacements.

Next up I will start on the tangential arm assembly and related components.