Beomaster 6000 4-Channel Repair: Replacing the Belts (O-Rings) in the Motor Unit
The O-rings or belts in the motor unit of the Beomaster 6000 4-Channel are often degraded at this age. They can be replaced by modern EPDM polymer o-rings. Unfortunately, the replacement of the O-rings requires the disassembly of the unit. The indicator bands need to be removed, and the volume, treble, bass, balance and front-back fade potentiometers need to be extracted to be able to insert new O-rings. The YouTube video to the right gives a detailed account of this procedure.
You can also check out my blog entry at http://beolover.blogspot.com for a detailed account of this restoration procedure: The photo on the right shows the new 3D printed clips for attaching the indicator bands to the potentiometer wheels. I used a Makerbot II. In my case the original black clips were too brittle to be able to be squeezed together sufficiently to get them back into the gaps that hold the bands. They broke immediately when I tried. The 3D printed ones were made from PLA. This material is not very elastic, but a 'pre-squeeze' reduced their angle a bit and gave them enough elasticity to fit comfortably into the gaps that hold the bands while leaving enough spring action to clamp the bands securely into place. The STL file for the clips is posted below. You should be able to print this file on any Makerbot II, as well as most commercial 3D printers. If you have access to ABS as printing material, it would probably be the better choice (more elastic). ![]()
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