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Vintage DD turntables. Are we living dangerously?

I have just acquired a 32 year old JVC/Victor TT-101 DD turntable after having its lesser brother, the TT-81 for the last year.
TT-101
This is one of the great DD designs made at a time when the giant Japanese electronics companies like Technics, Denon, JVC/Victor and Pioneer could pour millions of dollars into 'flagship' models to 'enhance' their lower range models which often sold in the millions.
Because of their complexity however.......if they malfunction.....parts are 'unobtanium'....and they often cannot be repaired.
128x128halcro
jpjones3318's avatar
jpjones3318
148 posts
 
Three hall elements = hall effect sensors.  They control the commutation. 

If the display blanks and the motor coasts to a stop, the over-current protection circuit is being tripped.  

This is a picture of the sensors - the windings are on the other side of the board.  This should show enough detail that you can trace the wires connected to the sensors to allow you to test them without opening the motor.  

http://fidelisanalog.com/wp-content/uploads/sites/3/2017/09/IMG_1634.jpg
lewm
12,845 posts
 
With all due respect to Mr Thalmann, he did not repair my TT101, perhaps because my TT101 always worked properly when it was at Bill's shop in Virginia. That is to be expected when something is "intermittent".

JP fixed my TT101, and it still is working perfectly to this day.  Do what JP says.
lewm
12,845 posts
 
And don't lose any of those five copper washers shown in the photo.  Also, when you put the motor back together, make sure you put the washers back exactly where you found them, as they effect critical spacing between rotor and stator inside the motor.
best-groove's avatar
best-groove
842 posts
 
Wow wow wow, great !!!

All of you have both given great hope to get my TT running.
Photography is very useful to understand a few things, on the internet there is no image of the TT-101’s engine content even on Japanese forums.
This is the first picture of the inside of the engine I see.

If it does work, it’s my wish to check and clean the pivot and bearing assembly to get some new oil, but I prefer to take a step at a time.

Many many many thanks to all the advice, I will keep you up to date on developments.


jpjones3318's avatar
jpjones3318
148 posts
 
Here's the other side of the board: http://fidelisanalog.com/wp-content/uploads/sites/3/2017/09/IMG_1633.jpg

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