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Tuesday, April 4, 2017

Beogram 6000 (5512): Restoration of Arm Lowering and Carriage

Usually the first step of a Beogram restoration is to restore the arm lowering, tracking and carriage drive systems. Here are a few impressions of this process as performed on the Beogram 6000 (5512) that recently arrived from Norway:

This shows the arm lowering mechanism in assembled condition:
One needs to remove all the linkages and then clean the pivot shafts and the sleeves. Furthermore the damper needs to be disassembled and relubricated. This shows all the parts of this assembly:
After lubrication and reassembly it was time to do the same to the damper to arm linkage. It can only accessed by taking out the sensor arm assembly. This shows the sensor arm in place:
After removal of the two screws at its base the linkage can be accessed:
This shows the linkage removed:
Don't loose the small spring that is under the circlip...it likes to jump behind a cabinet or similar - never just on the floor...;-).
After cleaning and lubricating the arm needs to be installed again and then it is time to adjust the arm parallelism:
The next step is replacing the tracing sensor light bulb with a Beolover LED assembly. The black square part is the bulb housing of the tracking sensor:
This shows the tracking aperture below:
The LED replacement part has a white SMD LED in the position of the filament of the light bulb:
On the backside of the assembly a potentiometer allows adjusting the light intensity:
Adjusting the light intensity takes most of the fuzziness out of the adjustment process of the tracking sensitivity. Like all Beolover parts, this LED assembly is available to other enthusiasts!

This shows the assembly installed:
The final task is to clean the carriage threaded rod and implant a new aluminum pulley. The black plastic pulleys tend to crack and then they are wobbly, which creates an unbeolovely vibration when the arms are moving. This shows the original pulley in place:
The new pulley in comparison with the original:
And here it is installed:
Beotiful! I'd be happy to get you in touch if you wanted to obtain one of these lovely pulleys for your own Beogram! Just send me an email, or use the contact form on the right.

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