Beogram 4002 (5513): Re-Attaching Keypad Segments

The 'beautification stage' of my current Beogram 4002 (5513) restoration continues: The final touch was to re-attach two delaminated keypad sections. Here is a picture of the issue:

I put a bit of superglue gel under the pads and clamped them down with vise grips:

One needs to be careful to not put too much glue there, since any excess can potentially reach the top of the pads, whose delicate paint surface can easily get irreversibly damaged by the glue. So my recommendation is to start with very little glue and see if it holds. If not put a bit more. Patience always pays off with such projects...;-).

This one worked out well the first time. All good now in keypad land:

Beogram 4002 (5513): Cabinet Repair and Guiding Washers Installation

While I was waiting for the pseudo balanced 'audiophile' RCA cables from Sounds Heavenly, I gave the cabinet of the Beogram 4002 (5513) some TLC. The cabinet was cracked on both corners, and all the guiding washers that hold in place and enable its sliding action were missing. Here is a picture of one of the corners:

It is easy to glue them back together since the cabinet is held together by metal bands. So all one has to do is to put some glue on the wood surfaces and hold it together with carpenter clamps until the glue is dry:

Much more beautiful after glueing the cabinet back together:

This picture already shows one of the new 3D printed guiding washers installed (this one is under the key pad). They enable the cabinet to slide on a precisely defined path (as demonstrated in my YouTube video about the washers). So if you have a 'wiggling' cabinet, then it is time to check if these washers are still there. They were originally made from a flimsy plastic that cracks and degrades over time (B&O realized that soon, and the 4004 models have metal reproductions of them...but the 4002s have usually the (missing) plastic ones. Here is a picture of the replacements. One needs five of them:

Here are the four other locations where I installed them on this Beogram:

Not much left to do except implanting the RCA cables and glueing the two side-tabs of the keypad back down (one can see one of them sticking up a bit on the picture above left of the 'START' label). A Beogram 4002 well on its way to a full recovery!

Beogram 4002/4004: 3D Printed Cabinet Guiding Washers

I am getting closer to finishing up my Beogram 4002. One of the still remaining annoying issues was the loose cabinet, which would not remain in its locked position due to the absence of the guiding washers that hold it in place. In the 4002 these washers were made from plexiglass, which easily cracks during the rigors of transport or just due to old age.

I opened up my Beogram 4004 to see how things look inside there, and it turns out that the 4004 has metal parts instead of the plexiglass ones in the 4002. I took measurements of one of those washers, and printed replacements on a Formlabs Form 1 stereolithography printer.

Here is a picture of the results: 

I also made a short video to demonstrate the functionality of the guiding washers:

The video shows that the new washers perform well. They are a bit elastic since the stereolithography printer plastic appears to be that way, so one needs to be a bit careful to not over tighten the screws when installing them. Otherwise, I was quite happy with the result. The cabinet slides snugly in its tracks.

Beogram 4002/4004: Replacement of the Transport Lock Bushings With 3D Printed Parts

I recently got into 3D printing with stereo lithography. This proved a valuable skill for replacing the decayed rubber bushings in the transport locks of my Beogram 4002. Here is a picture of how I found these bushings upon opening the Beogram up:

Clearly the rubber had seen better times. So I removed the fragments and designed a two-part replacement solution with Autodesk Inventor that could be conveniently installed without having to extract the floating turntable chassis. I printed the parts with a Form 1 stereo lithography (SLA) 3D printer, which produces relatively soft and pliable parts, ideal for the task of dampening impact during transport of a precious Beogram! Here is the result of my labor:

The 10-15 micron resolution of these SLA printers is much superior to filament based printers (~100 microns), i.e. it is a much better technology for small parts that need to have an exact fit. In this case, the fit needed to be pretty good to be able to generate a press-fit, that would hold both halves of the bushing in the opening in the chassis. This worked very nicely as you can see in this video, where I demonstrate the installation. Enjoy!: