Sudden slowdown on TD126 MK III

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DarthMaul
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Sudden slowdown on TD126 MK III

Post by DarthMaul » 02 Jun 2019 17:28

Suffered another sudden slowdown on my TD126 MK III. Folks, most of the time today and yesterday it kept its speed up, and it stayed stable. What could be causing this? Could the subplatter's bearing be at fault and need a de-oiling and re-oiling? Could the belt be at fault and need replacement? This slowdown occurred both this morning once and yesterday morning once. It did not happen last night. I do want to mention that I had hit the plinth prior to the slowdown happening, and it got jostled a bit and might have affected the belt and subplatter temporarily. When the slowdown occurred, after I took the stylus off, it sped up again soon after. I am not getting the problem of it constantly speeding up and slowing down.

The motor isn't having any problems starting up (it's not failing me), but upon first use it works more slowly than it should, and upon speeding it up to get the strobe to stay still, several minutes later it speeds up further, causing me to slow it down by turning the fine speed knob clockwise. Usually by this point it doesn't slow down or speed up very much and stays quite stable. Heavier records result in it taking longer.


Also, I should mention that the bottom washers of the springs on the bottom of the plinth came loose when the motor was first taken out weeks ago. I epoxied them back on. Getting the cups back in place, two of them went easily, the rear right one was tough.

Overall, the problems have become lesser but can still happen. At least I have the platter perfectly level.

DarthMaul
long player
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United States of America
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Joined: 18 Aug 2010 02:58
Location: Michigan

Re: Sudden slowdown on TD126 MK III

Post by DarthMaul » 02 Jun 2019 19:25

DarthMaul wrote:
02 Jun 2019 17:28
Suffered another sudden slowdown on my TD126 MK III. Folks, most of the time today and yesterday it kept its speed up, and it stayed stable. What could be causing this? Could the subplatter's bearing be at fault and need a de-oiling and re-oiling? Could the belt be at fault and need replacement? This slowdown occurred both this morning once and yesterday morning once. It did not happen last night. I do want to mention that I had hit the plinth prior to the slowdown happening, and it got jostled a bit and might have affected the belt and subplatter temporarily. When the slowdown occurred, after I took the stylus off, it sped up again soon after. I am not getting the problem of it constantly speeding up and slowing down.

The motor isn't having any problems starting up (it's not failing me), but upon first use it works more slowly than it should, and upon speeding it up to get the strobe to stay still, several minutes later it speeds up further, causing me to slow it down by turning the fine speed knob clockwise. Usually by this point it doesn't slow down or speed up very much and stays quite stable. Heavier records result in it taking longer.


Also, I should mention that the bottom washers of the springs on the bottom of the plinth came loose when the motor was first taken out weeks ago. I epoxied them back on. Getting the cups back in place, two of them went easily, the rear right one was tough.

Overall, the problems have become lesser but can still happen. At least I have the platter perfectly level.
Ok... The motor is having issues but not as many. Sometimes it doesn't spin up and needs a boost. It's not happening as much as before, as it starts on its own more often now.

Made the ultimate decision to get the pulley and rubber motor mount from Schopper AG. I am now leery about the old motor and don't trust it. But the speed problems during play don't seem to be coming back. I do not think a new belt is going to solve the motor issue. Best to have these parts just in case I need to get the spare motor installed. I will need my uncle's involvement due to soldering being needed. He has great soldering skills. If I had to learn, I would have used it for replacing an old game's coin cell battery used for saved games. Not for something like this.

I did spray the subplatter's well with WD-40 Specialist Electronic Cleaner Spray in hopes of getting rid of some oils. Added one drop to the subplatter's axis but no more than that. Last time I spun it super fast without the belt it took over 100 seconds to come to a stop. If I had CRC Lectra-Motive, I would have carefully sprayed it in there instead, because it's more powerful.

Edit: Just tested the motor with the platter on. 10/10 times it started. But some starts were slow, while others were fast. I bet if the other motor were installed, performance would go up. However, I need the pulley and motor mount, so that's why I went and bought them.

Now, if problems persist afterwards, I will send the turntable to "ddarch". But there's one thing I must mention that is not happening now: Drastic slowdown when the stylus is on the record. The strobe is a telltale sign. That happening is a playback killer for me.

DarthMaul
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Re: Sudden slowdown on TD126 MK III

Post by DarthMaul » 03 Jun 2019 02:01

Any advice for getting the pulley I bought onto the spare motor? The rubber mount will be the easy part. Also, advice for getting the wires from the old motor to the new would be appreciated. I know the wires coming from the can can be desoldered from the rectangular plate. I'm talking about the wires going to the other solder joints, the ones on the bottom of the can. Will the heat of a soldering iron damage the motor's speed sensor any?

DarthMaul
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Re: Sudden slowdown on TD126 MK III

Post by DarthMaul » 03 Jun 2019 03:24

Should I heat the pulley with a hair dryer to make it expand? It has cracks in it already. This pulley had cracks in it even when NOS.

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