|
|
Post by jukenorman on Jun 1, 2023 10:08:54 GMT
Hi Tony,
No, nothing missing there - that's exactly how it is! I've no doubt said this before but the mechanical action of the A&B side transfer should be mechanically identical execpt that the motor direction is reversed and the tone arm carriage is moved across. With NSMs, lack of adequate lubrication is often an issue. Not a hugely helpful response though, I concede!
Norman.
|
|
|
|
Post by teegee777 on Jul 24, 2023 20:56:34 GMT
Nearly another 2 months, so I thought I would have another look. The problem is definitely the lever which doesn't raise enough so consequently the toner arm has a lot of pressure on it and skips the tracks instead of moving inwards.
img-0923 is the B side playing, img-0925 is the A side.
The strange thing is it appears to lift OK if I turn the motor by hand, but not when it's in the jukebox. I've checked the diameter of the small wheels which run on the cog and they're 10.36 mm and 10.41mm
The other difference between A & B side is that the main shaft and gearing is turning in the opposite direction, but I guess the cam is arranged in the same manner. Can you skip a tooth and be 1 tooth out or something? Obviously by hand I don't know the exact position the record doesn't track.
**EDIT*** . Talking to my pillow last night , well awake thinking about it. It must be the switch ! The switch must be operating too early when on the A side, which then stops the shaft with the cam lobe, from lifting the lever. That's why when I turn the motor by hand it works OK. When I turn by hand I hadn't taken into account that the motor would have stopped (didn't listen to the micro switch) When I have time I'll let you know how it goes. Thanks Tony
|
|
|
|
Post by jukenorman on Jul 25, 2023 9:01:40 GMT
Hi Tony,
It's great when people respond to their own queries! The switch is probably a good shout and something that we've maybe overlooked.
Norman.
|
|
|
|
Post by teegee777 on Jul 25, 2023 21:22:52 GMT
Thanks Norman and others for allowing me to share the problem. It was the switch! (the operating switch) I was doing some other work on it at the same time as changing the switch and it hadn't struck me as a feasible issue. As you are aware you can't get the same switch as the original but the juke box spares company assured me that their micro-switch would work. I had to have a few goes at adjusting it and even now the B side lifts the lever higher than when it's on the A side (but as long as its lifted it works). I should note for people here that the cam goes clockwise for one side and anti-clockwise for the 2nd side. I think the manual says there's a 1.5 to 2 second braking period which I assume means the cam continues to turn for that period after the switch has disconnected the motor.I was fooled by the fact the lever lifted on the A side, when the motor was a turned by hand but perhaps that should have been a pointer to an electrical issue. There's some fine tuning to do now on "run off" at the end and the lifting of the toner arm,but hopefully I can find a happy medium on cutting off records early and not running off. One final question , what is that 2nd arm which some carriages have (I have) beside the record transfer arm? It's slightly bent but doesn't seem to do anything? Thanks.
|
|
|
|
Post by jukenorman on Jul 28, 2023 9:50:49 GMT
Hi Tony,
I don't know what you mean by "that 2nd arm which some carriages have". Another picture required maybe?
Norman.
|
|
|
|
Post by teegee777 on Jul 28, 2023 17:37:05 GMT
It's this arm, Tony  |
|
|
|
Post by jukenorman on Jul 29, 2023 10:17:29 GMT
Hi Tony,
Simple answer, I don't know! I have looked through the mish mash of NSM manuals that I have but none seem to show that in the parts list.
Norman.
|
|
|
|
Post by Hildegard on Jul 30, 2023 13:53:28 GMT
|
|
|
|
Post by teegee777 on Jul 30, 2023 18:30:35 GMT
Hi Hildegard, This photo shows the extra arm in use. The arm has a small wheel on it which operates off a cam on the bottom of the transfer arm assembly. Thus when the transfer arm is in the up position (record playing) then the extra arm has raised at the far end into the magazine assembly. It's almost like it has additionally "locked" the carriage in that position  A further update on my original issue. I had to readjust the operating switch again, as the switch was still allowing the main camshaft to stop too early. The lever had lifted, but not enough, consequently with the toner arm on its "weighted" pivot and moving inwards, the lever came close and slightly touching the plastic round stop and was therefore stopping the stylus from "running off" at the end of the record. I have now readjusted the "operating switch" so that by hand, approximately 34 revolutions after the stylus has touched the record, the micro switch operates. So far everything looks fine. Thanks Tony |
|
