Question about Technics SL-1210MK5 Turntable

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Buzzing from one Technics MK5 1200

Hello,

There is a buzzing sound coming from one of my turntables. I have changed the channels around and it still only comes from the same turntable. The other one is fine and there is no buzzing, but as soon as i move the crossfader slightly the buzzing can be heard. I've not plugged them into an amp, i'm running them a pair of creative speakers but as the buzzing is only from one turntable and not both i do think this is the problm. Could it perhaps be loose wiring within the specific turntable? Please help me out.

Thanks

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Where can i get the technic 1210 mk5 internal wires in the tone arm that connect to from the circuit board to the needle (the really long one inside the tonearm)

Posted on Jan 27, 2010

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More than likely your RCA's need to be replaced. There is no need to open it up, as the ground wire rarely every comes loose. It's held down by a screw & soldered to the circuit board. Unless you pulled on the ground wire.

There are only 3 issues which can cause this:

1) Technics Tonearm - Check the 4 prongs inside the tonearm. Make sure they are all clean (shiny gold), and all protruding the same distance. There are springs behind these prongs, and often times they do come loose over time or overtightening.

2) Technics RCA Cables - This is more than likely the culprit.

3) Cartridge/Headshell - swap out with your good unit. If it works, then your good. Just replace cartridge

With the exception of #3, the other 2 will require assistance from a qualified service technician, otherwise you could cause more damage to your turntables.

- OPTiC
Master Tech, 1200s.com
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Posted on Aug 29, 2009

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I just bought a used Technics 1210 MK2, its in great cosmetic condition, however when I turn it on its just a buzzing noise coming from the turntable, should I be worried...? and is there a cure?


The noise will be earth feedback. You might need to connect a wire to an earth point on the turntable - that goes to earth (a metal pipe etc). Sometimes the earth feedback is caused by the earth cable (green/yellow) in the plug either connected or not!

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The thing to remember with turntables is that if you touch the audio imput of where the deck connects and it doesn't buzz then there's something up with the amp. If it does buzz, then remove the leads to the cartridge and touch them one at a time with your finger. One should buzz in one channel and the other in the other channel. The two other wires are earths and generally don't buzz.
If you get the two channels to buzz the cartridge is faulty. If they don't then inside the deck is a fault (perhaps an internal pre-amp has failed).

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I hope you have it connected to the Phono input on the left rear of the receiver. Otherwise the minute signal generated by the phono cartridge is too small for the other inputs to process.

The buzzing noise/bad channel is probably a bad connection in the tonearm/headshell connection or one of the 4 wires attaching the cartridge to the shell. If you DON'T want to blow up your speakers, TURN YOUR RECEIVER OFF, turn the volume to 0 or select another input before messing around with the tonearm.

Swap the two channels from the tonearm to the Phono connectors to prove the buzzing is external (at the turntable). I think the Dual CS415 uses the old standard headshell. With the volume down flip the lever toward the back, carefully remove the assembly and look over the tiny multi-colored wires with the brass crimp-on ends. We're looking for tight kinks or broken wires. Then put it back. maybe reseat it a few times to wear off any oxidation and try it again.

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It is not suggested that you remove the ground cable. Performing the mod for the ground by soldering a bridge on the circuit board doesn't really do anything either than remove that buzz/ground hum. You've essentially removed the wire that grounds the turntable cabinet to the earth. The buzz is gone, but now your turntable is no longer grounded properly.

I would suggest replacing the ground cable to it's original state, then attach the Monster cables.

If this does not work, then either there is an issue with the soldering to the board, or the board itself might be damaged. You might want to look at the trace paths to make sure none are lifted, or damaged in any way on the board. Another issue might be faulty tonearm wires or not properly soldered wires.

FYI, monster cables are not good for this purpose. I would suggest the following cables:

MOGAMI RCA CABLES

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The ORIGINAL 1200 TECHNICIAN.

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Mar 20, 2009 | Technics SL-1200MK2 Turntable

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Sound noize


Hi again,

Appreciate the postback and additional information. Have you tried running the turntable without the cartridge/needle? If the buzzing is still there, try removing then the new wires that you have installed. Since it is a process of elimination, the point where the buzzing disappears would be the point of further diagnosis then.

It it were a hum, the it is possibly spillage of the AC power supply, but since it is a buzz, then it is relatively high frequency.

Cheers.

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check connection of ground wire (thin black cable)

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