Question about Technics SL-1200 Turntable

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My technics 1200 hums when connected to the amp even when the power cord is disconnected.

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Is the ground wire from the deck connected to the mixer?.

If everything is connected ok then the ground wire or phono cord could be faulty - look here for replacements :-
http://stores.ebay.co.uk/methleykev

Could also be a "ground loop" - try a ground loop isolator.

Posted on Jul 13, 2010

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1 Answer

My technics 1200 mk3d powers up and the platter spins but I'm not getting any sound out of it when my cartridge is in? Any help would be appreciated.


Disconnect ALL of the wires to the cartridge. With the amplifier on, the turntable connected, put your finger on each one of the wire ends to the cartridge one at a time. On two of the wires you should hear a loud hum, one on the left and one on the right. The other two wires are earths and will probably make little or no sound at all.
If you hear the hum then the amplifier is working and the connections between the deck and amp are good. In which case you have a faulty cartridge or poor connectors to it.
If you get no hum, then either the wires between the deck and amp are faulty. Or there is a fault in the magnetic cartridge pre-amp inside the amp. If the hum is weak, that too could indicate a faulty pre-amp. Or that your amp doesn't have one. In which case you will need to connect one between the deck and amp. This will apply if the amp has no dedicated "phono" socket.

Jul 15, 2014 | Audio Players & Recorders

1 Answer

Guitar amp continuous humming from speaker


Firstly, do not disconnect the speakers from the amp when it is on. Damage is possible.

You have a bad ground somewhere in the hookup. The first suspect would be your guitar-to-amp cord shielding connections at each plug, then, the wiring in your guitar. Try changing each of these to another as a trial, one at a time.

Here is Marshall's spiel on hum

http://www.marshallamps.com/support/faq/hums-hisses/

Mar 11, 2014 | Audio Players & Recorders

2 Answers

Replace Power Cord - Technics 1200 MK2


It's an ac cord. there is no positive and negative. the solid black side is "hot" and the ribbed or striped side is "neutral".

Apr 28, 2013 | Technics SL-1200MK2 Turntable

1 Answer

Need to replace power cord - Technics 1200 MK2


As long as the only thing damaged is the power cord, this should be easy. You said that you needed to know how to tell which side is positive and which is negative? The power cord carries alternating current not direct current. So in this case, polarity really isn't important. The same applies to the two yellow wires supplying the main motor board. They are A/C too. As long as the replacement cord you use is of equal or higher power handeling, and you make sure your connections are solid, it will work fine regardless of polarity. Just be sure the only problem is the cord. Check this link to be sure. Good luck, EW.
This link is a must have for anybody diagnosing a problem with a SL1200/1210. Take a look:
http://www.deckdoctor.com.au/TECHNIC%20SL1200%20PCB.pdf

Apr 28, 2013 | Technics SL-1200MK2 Turntable

1 Answer

False paper out message


An 'Out of Paper ' error message displays on the product control panel display, and the product does not pick up or feed paper from the photo tray.

Try to reset the printer:
  • Disconnect the power cord from the electrical outlet.
  • Disconnect the USB or Ethernet cable from the back of the product.
  • Disconnect the power cord from the back of the product.
  • After 30 seconds, connect the power cord to the back of the product.
  • Connect the power cord directly to an electrical wall outlet.
  • Connect the USB or Ethernet cable to the back of the product.
  • Try the print job again.


If you need any technical help on printer then you can reach at http://www.vtechsquad.com/

Nov 16, 2012 | Xante ScreenWriter 4 Laser Printer

1 Answer

Major hummimng noise when sub is connected to receiver.


Is the hum in the receiver-attached speakers or the sub?


Self-powered sub?


How is the sub attached - RCA or speaker-level?


Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.


If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.

Mar 25, 2011 | Yamaha RX-Z9 Receiver

1 Answer

There is a significant high pitch running through my speakers. I checked speaker wires, & plugged in power cord into a different outlet. Still no luck. Any suggestions?


Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Mar 06, 2011 | Harman Kardon AVR 300 Receiver

1 Answer

I have a spider III 15W amp that has worked for a year. plugged in last night and it's getting power but no sound. Not even a hum from the speaker. checked everything and it's definitely the amp....


Try disconnecting the speaker from the amp with the amp unplugged from your power. Never work on an amp when its plugged in unless you know how dangerous it is. Check for resistance across the speaker terminals with a volt ohm meter to see if you have a blown speaker. Thats the first thing to look for. You should here a hiss or a low hum when your amp is on and you plug a guitar cord into the input without the guitar. Check those two things first.

Jul 15, 2009 | Line 6 Spider Iii 15 Modeling Guitar...

2 Answers

Bought a used Martin Logan Dynamo subwoofer a couple days ago and have a very loud hum when the ac cord is plugged in, even if the speaker is not connected to an audio source. The "hum" can be heard in any...


Neither the amp or the sub have grounded power cords.

I have discovered the ML Dynamo takes about 30 minutes to switch to standby in auto mode.

With speaker level inputs connected to the Onkyo A807 amp, both units powered from the same wall outlet, Dynamo sub on Auto, the sub hums for about half an hour after the Onkyo is switched off, then the sub goes quiet. Not so good.

I connected a bonding wire between the two units on 3_7_09. If I smoked some old audio gear I could just look at that as an opportunity, right?

Works fine. Now I have the ML powered from the wall and working normally.

Jun 30, 2009 | Dynamo MartinLogan Subwoofer Speaker

1 Answer

Technics 1200 turntable - no power Musical Fidelity AMP - no power


Technics 1200 - if the mains cord connectors and fuses are ok - it could be the power switch - when you rotate the switch do any lights come on? If it is just no rotation of the turntable platter then it could be the motor controller IC.

There is an internal regulator - often the associated zener and transistor fail.

Please rate this as a genuine cure - I know these inside out and with a bit more information I can give you a solution.

Mar 19, 2008 | Audio Players & Recorders

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