NSM City II - Rotation Speed adjustment?

[jukenorman]

So about three per cent too fast! I think I would now be inclined to replace the turntable rubber tyre (tire) - jukebox-world.de - if I were in your position. It's probably slightly worn and maybe a bit compressed.
Norman.

[Ron Rich]

I shoudda knowed-- NYC--Of course--"Con ED" stirkes again !! LOL Ron Rich

[jbnyc341]

Norman, the rubber looks ok at first sight, but your explanation makes total sense - I would not be able to tell if it shrunk from its original size or not.
Will order this rubber tire and hopefully that will fix this little problem. Thanks for the great idea!

[Hildegard]

Hi Julien,

I followed up this again just now. To be honest, I can't give any suggestions to solve that speed issue.

In general I also tend to think that a speed of up to 46.5 was "usual" back then. Most people, especially in bars or so, probably never realized. Because in a location they did not listen to the music like somebody would do at home.

If the rubber ring on the TT would be worn, then it happens that

- the sound is cranky: The rubber does not have enough grip any longer, the little axle slips from time to time and the speed in not even, it varies.

- a noise is disturbing the sound quality: When the rubber got hardened or brittle or damaged one would hear a noise every time the little axle hits this damage.

So far I never heard that the speed would get faster when the surface of the rubber is too smooth. But of course it should have enough grip.

Hildegard

[jbnyc341]

Sorry for the late reply - did not check on the forum lately as I was awaiting for the new rubber ring as my next step.

Hildegard, thanks for the appreciated follow up - problem addressed though (see below)

Norman, I received the rubber ring yesterday and .... you're a GENIUS !!! - it now works as it should and turns at 45rpm! (verified with your stroboscopic disc and by playing MP3 in parallel)
At first, the sound was not great because rotation was not even, but that was due to the glue residue of the initial ring that were causing slight bumps under the new one.
I sanded very gently the dried glue with a Dremel, put the new rubber on and cleaned it up with rubbing alcohol to optimize the grip (some white powder was on the new one) - the speed is now just P-E-R-F-E-C-T! Thank you so much!

An "old" problem came back though as the carriage is now moving erratically when trying to access a disc after a selection. It was happening when I first acquired the juke and I thought it could be a broken wire in the harness that was not energized continuously depending on the way the harness was bent. It went away after working on other issues with the carriage board, so I forgot about it after that. It's back now although I noticed that the problem seems to fade away after 10-15min of having the juke powered (will have to confirm that over time) - So I am now wondering if it could be a failing electronic component (capacitor?) on one of the boards. Not sure where to look though.

Anyway - I'm super happy with this old speedy problem that is now resolved. Thank you very much!

Julien

[jukenorman]

Pleased to hear the speed problem has been sorted finally! With regard to your other problem, check that the harness is adequately supported where it should be. NSM plugs and sockets are relatively flimsy so it's important that the connections are not strained in any way.
Norman.