This post describes the work done on the Beogram 4000 from Massachusetts that I recently put on my bench. Please, see this post for the initial assessment of the unit.
This shows the unit in original condition with the panels removed:
As usual, I started out by restoring the carriage. I focused first on the mechanical aspects. This unit had a lot of grease applied to the carriage sliding mechanism, while the arm lowering assembly showed sign of the usual hardened lubricants: