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post #1 of 12 Old 04-14-2008, 09:25 PM - Thread Starter
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A friend of mine has a good ol' Technics belt-drive turntable (forgot to check which model; hopefully he'll jump in and say) which suffers from speed fluctuations. He's changed the elastomeric belt a couple of times, he says, but the problem persists.

Is it worth getting fixed or should he replace it, and if so, with what model?
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post #2 of 12 Old 04-15-2008, 12:33 PM
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He can buy a new Technics beltdrive for less than $100. Fixing his old one would cost at least as much.

If you can't explain how it works, you can't say it doesn't.—The High-End Creed

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post #3 of 12 Old 04-15-2008, 07:28 PM - Thread Starter
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He says his model is a Technics SL-23 from the mid-seventies.

What replacement model would you recommend?
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post #4 of 12 Old 04-15-2008, 08:02 PM
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I was thinking of the SL-BD20, $90 at J&R. He can spiff it up with a better cartridge ($40-80) at lpgear.com. But this isn't as good as the table he's got now, if it were working properly. He might find some good advice on fixing it here.

How much would he consider spending for a new table?

If you can't explain how it works, you can't say it doesn't.—The High-End Creed

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post #5 of 12 Old 04-19-2008, 09:20 AM - Thread Starter
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He says:

Quote:


The information provided in the link is very useful; the trouble seems to be
worth it for a turntable of such sturdy construction. I am ready for my
Science Project.

Thanks

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post #6 of 12 Old 01-30-2010, 11:12 AM
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I will post a repair guide soon.
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post #7 of 12 Old 01-30-2010, 11:13 AM
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I will post a repair guide as soon as I have two more posts, to comply with anti-spam
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post #8 of 12 Old 01-30-2010, 11:13 AM
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Only one more to go!
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post #9 of 12 Old 01-30-2010, 11:37 AM
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If you have a 25+ year-old Technics belt drive turntable, and it won't maintain a steady speed, replace the belt.

If that doesn't work, probably the speed controls themselves are ruined. These "trimmers' or "potentiometers" are composed of carbon, and deteriorate over time. There are two of these devices, located on the underside of the turntable.

First, remove the headshell and put it in a safe place. You don't want to spend the time to repair the turntable, only to have destroyed your stylus in the process! Then lock down the tonearm and remove the platter.

Remove the bottom cardboard cover, and locate two circuit boards containing the "pots".



The "coarse adjustment" board is here. One is for 33 RPM, the other for 45:



Here is the other; the Pitch Control:



If you feel lucky, you can give both of these a shot of WD-40, and work them back and forth. Sometimes that fish oil does the trick, at least temporarily.

For a permanent repair, purchase the following equivalent parts. Mouser Electronics is a Web source, and these are their part numbers:

coarse: 652-3309P-3-203 (need two if replacing 45RPM)
pitch control: 531-PC16SH-4.7K

The pitch control pot is held in place with barbs moulded into the body:



Trim these off, unsolder the bad pot, and enlarge the metal bracket to accomodate the new one.



The new one is a little longer than the old one; trim the shaft.



The new pot is held in place with a washer and nut, supplied with the device.



Replace one or both of the coarse adjustment pots. Set the value with a small screwdriver to the middle of the range of adjustment.



Reattach the pitch control knob. You may need to enlarge the hole on the knob, or trim the shaft. A little hot-melt or epoxy may be required. Ensure that the knob turns freely without rubbing the case before reattaching the bottom cover.

Enjoy!
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post #10 of 12 Old 01-30-2010, 12:02 PM - Thread Starter
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Thanks for this!

May I suggest that to be more effective, you re-edit your guide to include the pictures as visible images rather than links. Just use the Insert Image button rather than the Insert Link button. Also, make sure your pictures are big enough to see details, i.e., about 640x480 or so.

I've got a friend with one of these, and we made plans to fix this great old turntable one of these days. Maybe your guide will be the impetus that finally gets us to do it.
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post #11 of 12 Old 01-31-2010, 01:20 PM
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Thanks for the suggestion!

Go for it!
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post #12 of 12 Old 01-31-2010, 02:40 PM - Thread Starter
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Very nice, now! I printed it out and will show it to my friend. Thanks again!
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