Discosound DJ turntables loud popping noise - UK Vintage Radio Repair and Restoration Discussion Forum

uk_snowman · 24th Jun 2016, 11:51 am

I have a Discosound DJ with twin turntables.

When the turntable on the right switches off there is a very loud popping noise from the amp. The left turntable is fine so the problem must be on a part that affects the right side only. I'm wondering whether this is likely to be a cap problem or not.

Any ideas would be appreciated, as this is something I've never had before.

Thanks

Jonster · 24th Jun 2016, 11:53 am

There should be a capacitor across the terminals of each motor switch, probably 0.1uF 500v. You should be able to find a replacement inside an old PC SMPSU.

Nickthedentist · 24th Jun 2016, 12:28 pm

But if there's no capacitor fitted, and yet the other TT works fine without one, then the fault is probably that the switch has dirty contacts or is "tired" and doesn't break the current cleanly. Have a look inside.

These turntables are BSRs and are probably fitted with AC (mains) motors.

N.

uk_snowman · 24th Jun 2016, 7:24 pm

The left one has a 5000pf cap fitted which is a .005uf, the right one had none, so I have fitted a .0045uf cap and this has stopped the poping noise in the mid to low volume

Edward Huggins · 24th Jun 2016, 9:44 pm

....er, otherwise known to us old (and unforgiving) Farts as a "switch click suppressor". Edward

24th Jun 2016, 11:51 am	#1
uk_snowman Hexode Join Date: Jun 2013 Location: Norwich, Norfolk, UK. Posts: 281	Discosound DJ turntables loud popping noise I have a Discosound DJ with twin turntables. When the turntable on the right switches off there is a very loud popping noise from the amp. The left turntable is fine so the problem must be on a part that affects the right side only. I'm wondering whether this is likely to be a cap problem or not. Any ideas would be appreciated, as this is something I've never had before. Thanks Attached Thumbnails __________________ Now where did I put that part again!!!

24th Jun 2016, 11:53 am	#2
Jonster Heptode Join Date: Apr 2008 Location: Eastbourne, East Sussex, UK. Posts: 671	Re: Discosound Dj turntables lould poping noise There should be a capacitor across the terminals of each motor switch, probably 0.1uF 500v. You should be able to find a replacement inside an old PC SMPSU.

24th Jun 2016, 12:28 pm	#3
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,861	Re: Discosound Dj turntables lould poping noise But if there's no capacitor fitted, and yet the other TT works fine without one, then the fault is probably that the switch has dirty contacts or is "tired" and doesn't break the current cleanly. Have a look inside. These turntables are BSRs and are probably fitted with AC (mains) motors. N.

24th Jun 2016, 7:24 pm	#4
uk_snowman Hexode Join Date: Jun 2013 Location: Norwich, Norfolk, UK. Posts: 281	Re: Discosound Dj turntables lould poping noise The left one has a 5000pf cap fitted which is a .005uf, the right one had none, so I have fitted a .0045uf cap and this has stopped the poping noise in the mid to low volume __________________ Now where did I put that part again!!!

24th Jun 2016, 9:44 pm	#5
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,336	Re: Discosound Dj turntables lould poping noise ....er, otherwise known to us old (and unforgiving) Farts as a "switch click suppressor". Edward