Technical Difficulties Thread

HiFi Guy

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Got the new belt on, it definitely turned without an issue like the old one had but then I noticed it was playing things verrryyy slow.

Ive since then adjusted the pitch control and it seems like things are running as normal but I'm not feeling like I don't have the pitch dialed in accurately. I used a phone app put the phone on the table and I come approximately close to the expected speed. How would I be able to ensure I've got the right pitch?

I'm planning to take this in at the end of August when the guy at the use gear shop is back from holiday to get it properly tuned up.
The best way is with a strobe disc. Get one that is smaller in diameter than an LP. Gently place it on top of a record on the platter. I keep an old beat up LP around for just such things.

Then play the exposed part of the record. You’ll be able to adjust the speed while taking account of stylus drag.

Accelerometers in smart phones aren’t really precision devices.
 

uvwxVinyl

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The best way is with a strobe disc. Get one that is smaller in diameter than an LP. Gently place it on top of a record on the platter. I keep an old beat up LP around for just such things.

Then play the exposed part of the record. You’ll be able to adjust the speed while taking account of stylus drag.

Accelerometers in smart phones aren’t really precision devices.
Would you still use your phone for the strobe light?
 

uvwxVinyl

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@uvwxVinyl Hold it. Does your turntable have a strobe on the platter?
Haha actually I realized that just before I went to bed by reading the manual about changing the pitch control timing belt (which ill do anyway I'm the next few weeks). Anyway the discovery helped me sleep easily.

I have 4 rows of dots on the platter and I flashed them with the 60hz and 50hz strobe app and was able to dial the pitch and verify until the respective line of dots appeared to stand still at the corresponding speed.

I think it sounds pretty good now. They said in the manual it should ideally be a light source from the same AC main so there's a chance I'm slightly off with the smart phone but I can't hear it anymore.
 

uvwxVinyl

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I had another hiccup today I believe it actually is indeed a lubrication issue.

The motor was getting jammed again and you could see it spinning slightly counter clockwise as it struggled to turn the platter.

I removed the platter and notice the rotor spindle also required a bit of an effort to spin by hand. I wish I took pictures when I took it apart but I removed 30 and 2 as shown in the service manual below.

I noticed there was some oil still in there so I twisted it a bit so that the rest of the shaft would get greased. When I put it back together I could spin rotor really smoothly by hand.

Screenshot_20200802-140218.jpg

Anyway everything is working again now. I guess I should have it properly lubed in the service as well. I don't really know how much or what I should put in there, so I guess I'll leave that to the turntable service guys. The new belt has helped, I do notice the wow platter to have gone away but I assume the reason for the problems in the first place was dried up lubrication on the rotor.

Im an Engineer but I feel pretty pleased taking this apart and solving the issue myself. Learnt a lot about my turntable this way and its pretty cool to see how great these things were designed back in the day. You don't see service manuals like this these days either.
 

HiFi Guy

All Things Audio
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I had another hiccup today I believe it actually is indeed a lubrication issue.

The motor was getting jammed again and you could see it spinning slightly counter clockwise as it struggled to turn the platter.

I removed the platter and notice the rotor spindle also required a bit of an effort to spin by hand. I wish I took pictures when I took it apart but I removed 30 and 2 as shown in the service manual below.

I noticed there was some oil still in there so I twisted it a bit so that the rest of the shaft would get greased. When I put it back together I could spin rotor really smoothly by hand.

View attachment 59566

Anyway everything is working again now. I guess I should have it properly lubed in the service as well. I don't really know how much or what I should put in there, so I guess I'll leave that to the turntable service guys. The new belt has helped, I do notice the wow platter to have gone away but I assume the reason for the problems in the first place was dried up lubrication on the rotor.

Im an Engineer but I feel pretty pleased taking this apart and solving the issue myself. Learnt a lot about my turntable this way and its pretty cool to see how great these things were designed back in the day. You don't see service manuals like this these days either.
Good news. Yes, all turntables require periodic lubrication.
 
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