-edible zone-
-- Date: March 2024
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-- Above two photos: just before the take-down.
-- Above photo: yes, I had given the platter bearing plenty of lube. Straight 20 wt turbine oil.
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-- Above photo: Retainer stud assembly. One next to each coil spring. Purpose is to keep the subchassis from falling off should the turntable become inverted. And you have to unscrew and remove the nuts and washers and seals from underneath before you can remove the subchassis.
It's a sprungie. The suspended subchassis is supported from
beneath on a steel plate .083 inches thick. (2.1mm) More info on
that later as I collect data. Of particular note is that this
not-very-thick steel plate has threads that engage those.of the
adjustable cups - which hold the springs that float the subchassis.
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-- Above: Dirty motor pulley. Last time I cleaned it was 2016, or thereabouts.
Now it's clean. Rubber jacket too.
Note how the motor appears to be wearing a rubber jacket. I wonder
what it looks like underneath. Additionally, I gather, these motors are
scarce. Nonetheless I'd like to see one disassembled. But
not this one. It seems to be working right.
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-- Above photo: the underside of the motor.
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-- Abve photo: The cast subchassis stands on its springs.
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above photo: retainer stud detail The insulation is still soft and pliable --- its purpose: to keep the retainer stud assembly from making metal to metal contact with the steel plate holding the subchassis cups. The same plate that also holds the motor.
casting serial numbers
-- Above: the sealant goo is showing signs of partial hardening. It took some time and care, using just fingers, to break the grommets and springs free of the bond. The sealant had a firm hold on those parts.
-- Summary: Initial disassembly. We see the construction of the plinth and how the subchassis is held. More details on that to follow. The subchassis itself is die cast zinc. (you know, zinc --- the other white metal ;-^ Bare, the subchassis weighs 7 lbs. (bathroom scales) Another thing is quite obvious; the subchassis rings like a bell when you thump it with your fingers. It clangs.
Also of note is that the motor is held directly on this steel plate that also holds the threaded plastic cups which in turn hold the conical coil springs that are isolated with rubber grommets. It would be interesting to measure motor vibrations when under load and to discover how these vibrations travel through this .083" thick steel plate. (2.108 mm)
-- End Part 2
-- Back to TD126-III ... In the beginning (part 1)