Technics SL-1210MK2 - weird speed problem - Page 6 - diyAudio
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Old 2nd March 2007, 11:03 AM   #51
Netlist is offline Netlist  Belgium
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It will surely give you many more years of pleasure now.
This is what I call a rewarding repair.

/Hugo
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Old 3rd March 2007, 01:29 AM   #52
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Yes it feels very good being able to fix the turntable. It sounds good too. It came with a Shure M91 cartridge which sounds not bad at all. Better than an older Technics cartridge.
Can anyone recommend a good cartridge to go on the EPA120 arm ? Not too expensive.
Thanks.
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Old 3rd March 2007, 12:01 PM   #53
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Nice to hear that the problems where solved by replacing some transistors gone bad.

I think the tonearm has quite a high effective mass, probably a bit higher than the one on my SL-1300, which is on the heavy side already.

If so, then what you need is a low compliant cartridge. When looking at the cartridges still available, the low compliant Denon DL-103 MC cartridge comes to mind. Since it's a low output MC cart you will need a good MC preamp or an MC step-up with a MM preamp.

A bit more compliant but probably still low enough are the high-output MC's Denon DL-110 and Denon DL-160, and the MM Audio Technica AT440MLa. Especially in the US the AT440MLa is very affordable: about 85 USD. The DL-110 is not expensive either, though the DL-160 probably offers a better performance/price ratio.

Apart from the match from a technical perspective you might also think of the match with the rest of your system. If your system is already on the bright side to your tastes, my experience is that a DL-160 (and probably too a DL-103) or AT440MLa can be too much out of the box. If this is the case, you could try to compensate for this by lowering the capacitive loading (MM) or lowering the cartridge load resistance (MC). See
moving coil loading for a discussion on cartridge load tuning.
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Old 7th March 2007, 07:17 AM   #54
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So I replaced the AN6680, but it did not remidy the problem. It did make the table run a little more stable but I'm still can't get 2 tables to stay in sync when trying to mix. I've worked with many others 1200's so I do have a point of reference. I suppose my next step will be to replace the crystal. Btw, I have checked the pitch control settings with a voltage meter and everything is coming up good, so the pitch control is not thie issue here. Just wanted to give an update on my experience.
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Old 7th March 2007, 07:32 AM   #55
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A few more tips:
Check if transistor Q201 and surrounding resistors are well soldered.
If you have a frequency counter, with platter removed, and motor active, check TP27 for a stable 262.08kHz.

/Hugo
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Old 13th March 2007, 11:17 AM   #56
rapala is offline rapala  Romania
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my problem solved! The main motor was the problem.It was fixed by some specialists.I hope it will last. Thx guys!
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Old 25th May 2007, 01:16 PM   #57
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Default Technics SL-1200 Service

here`s a link for the sl 1200 Manual
free download,schematics (pdf)
http://www.eserviceinfo.com/download...s_SL-1200.html
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Old 7th March 2008, 02:46 PM   #58
kemes is offline kemes  Finland
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Hi,

I recently bought a pair of sl1200 and both of them have the same problem.


sl1200 speed bounce


This affects the platter speed also when i'm trying to slow down the platter just a little bit. It speeds up a bit after i've slowed it down and then it returns to a stable speed.
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Old 5th July 2008, 06:25 PM   #59
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Woohhaaawooow!

I guess it's one of the only place where people talk about this freaky problem...
I didn't find a single page in French on this.

Well, I bought a couple of 1210, that was 3 years ago, and I had a problem with the first one after 8 months...
Sent it to the shop since it was still on warranty and I got a new one which hopefully won't die.
The guy told me that Technics had a bad stock, with messy ICs or Quartz.

I didn't have any problem until now, but of course, now that I'm screwed with the warranty, the second one shows the exact same problem than the first one: after 5 minutes, the speed starts to oscillate around -8%, and then after 10 minutes, it goes all crazy all the way from -8 to +8.

I dld the manual, and was about to go and get a scope at my lab to fix this stuff tomorrow.
But now I think I have the answer to my problem!
Thanks a lot guys, I may still verify with a scope, but I know where to check at least!!!

By the way, anyone knows where to buy the IC (AN6680) in Europe?
I'd like to buy it from the US, but last time I was f**d by the custom when I bought records from detroit

Thanks again!
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Old 1st February 2011, 01:32 PM   #60
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Sorry to revive an old thread, but I had to say thanks to everyone who contributed to solving this problem. Cheers guys, you have saved me a massive headache!

My 1210 started showing the symptoms of a failing IC201 and I had no idea what was causing it until I came across this thread. Luckily in my case I didn't need to replace the chip, a resolder was enough to fix the problem.

Again, cheers guys.

Chris
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