Faulty Dual CS 410 turntable

[Electronpusher0]

Being a black deck it is possibly a CS-420, the spec for this deck is 12Vdc 150mA
https://www.dual-plattenspieler.eu/p...al-cs-420.html

Peter

[GeoffK]

When you say you could list the many skills you do have, could you list one where there may be a common comparison thread to make things easier to understand. I am not a rocket scientist either but understand the basic concepts of that, in fact rockets aren't all that complicated.

[WalterGibbons]

Sorry, life got in the way!

This is the TT I have:
https://www.ebay.co.uk/itm/DUAL-CS-4...UAAOSwW-heFxoc

There is no marking at the input but there is a sticker which states "12V=(DC)"

[Station X]

This thread is going nowhere fast.

No help has been offered by members in Glasgow. I don't criticise them for that.

We been several times round the loop of discussing as to whether the PSU is adequate for the job. The OP states that the TT worked for 30 years before failing, so obviously it is/was up to the job, even if labelled incorrectly

It would be a good thing if the OP tested it as shown in post #16. Given a result of that test we might make some progress.

[Chiltern]

By chance at an auction this week I gained a job lot of hi fi.

Included is a Dual turntable, similar series to the OP's, a CS435. It is clearly marked 12vDC on the rear, but the included power supply (which I have no reason to believe is not the original), is a Dual product but is shown, output 10.5vDC at 40Ma. And that is what it is, output plug, not one I'm familiar with, centre pin positive. The deck, after another belt (the original very 'set', almost impossible to straighten out) the deck functions fine and for something very lightweight sounds surprisingly good.

Mat has cleaned up, unfortunately the deck used in a fitted cabinet, so no hinges/lid.

Alan
Pics attached.

[WalterGibbons]

Originally Posted by Alan SP15

By chance at an auction this week I gained a job lot of hi fi.

Included is a Dual turntable, similar series to the OP's, a CS435. It is clearly marked 12vDC on the rear, but the included power supply (which I have no reason to believe is not the original), is a Dual product but is shown, output 10.5vDC at 40Ma. And that is what it is, output plug, not one I'm familiar with, centre pin positive. The deck, after another belt (the original very 'set', almost impossible to straighten out) the deck functions fine and for something very lightweight sounds surprisingly good.

Mat has cleaned up, unfortunately the deck used in a fitted cabinet, so no hinges/lid.

Alan
Pics attached.

Thanks Alan, this is a big help!

[barretter]

The other stupid question which has not been asked or answered is: has the fuse in the mains plug for the power supply blown? They do wear out with time and a replacement would be cheap and not a waste of money - they always get used eventually.

[WalterGibbons]

Originally Posted by barretter

The other stupid question which has not been asked or answered is: has the fuse in the mains plug for the power supply blown? They do wear out with time and a replacement would be cheap and not a waste of money - they always get used eventually.

Unfortunately there's nothing in there that I recognise as a fuse - just all circuitry.

However, I'm just back from RS where the guy kindly tested for me and it seems it's only reading 4v. So at least now I'm almost certain I need a replacement PSU - which they didn't have! Not with the right connection anyway.

Can anyone point me in the direction of a replacement. I see plenty of things that *might* work, but I'm never 100% sure!!

[Station X]

If we're to recommend a PSU we'll need to know the type of connector fitted and its size ie external and internal diameter.

I have a box of wall warts and may be able to find something suitable, but the connector type and polarity is important,

[WalterGibbons]

Just send you a message, Graham. Thanks.

[Station X]

I received your PM.

I checked my box of wall warts and the nearest match I could find was 12V 300mA centre positive. Unfortunately it's unregulated and when loaded to 20mA the output voltage was far too high.

-----------------------------------------

This should do the job. If the connector is the wrong type you could cut the connector off and use chocolate block to connect the lead from your old PSU to the new PSU.

BEING CAREFUL TO OBSERVE POLARITY.

https://www.ebay.co.uk/itm/2-x-Plug-...AAAOSwd7BZohfW

Other PSU's and suppliers are available.

[WalterGibbons]

Originally Posted by Station X

I received your PM.

I checked my box of wall warts and the nearest match I could find was 12V 300mA centre positive. Unfortunately it's unregulated and when loaded to 20mA the output voltage was far too high.

-----------------------------------------

This should do the job. If the connector is the wrong type you could cut the connector off and use chocolate block to connect the lead from your old PSU to the new PSU.

BEING CAREFUL TO OBSERVE POLARITY.

https://www.ebay.co.uk/itm/2-x-Plug-...AAAOSwd7BZohfW

Other PSU's and suppliers are available.

Ordered!

[Nickthedentist]

BTW, "polarity" means getting the + and - wires the right way round. Getting it wrong is like putting a battery in backwards. Doing this can destroy chips and transistors and might spell the end of your turntable and/or your new power unit, so please check and ask us to double check for you

[WalterGibbons]

Originally Posted by Nickthedentist

BTW, "polarity" means getting the + and - wires the right way round. Getting it wrong is like putting a battery in backwards. Doing this can destroy chips and transistors and might spell the end of your turntable and/or your new power unit, so please check and ask us to double check for you

Thanks! Yes, that's one thing I did grasp! Hopefully this unit may fit straight out of the box. If not.. well, I'll cross that bridge when I come to it

[WalterGibbons]

Its a fit!! We have power.

But now a new problem..

The turntable is now spinning at the speed of sound. I'm almost enjoying this now - what's my next step?

[Station X]

I suggest you obtain the service manual to see what electronics are associated with the motor.

https://www.vinylengine.com/library/dual/cs-410.shtml

[WalterGibbons]

Originally Posted by Station X

I suggest you obtain the service manual to see what electronics are associated with the motor.

https://www.vinylengine.com/library/dual/cs-410.shtml

Yes, the guy who struggled with a paper clip and fairy light bulb will definitely be able to work out how to fix this with a service manual. In German.

[Station X]

You're going to be struggling with any advice given.

Circuit diagrams are the same in any language.

I suggest you download the manual, extract the circuit from it and post it here. Someone, with more knowledge of motor control circuitry than myself, may be able to advise you on how to test and repair the electronics

[WalterGibbons]

Originally Posted by Station X

You're going to be struggling with any advice given.

Circuit diagrams are the same in any language.

I suggest you download the manual, extract the circuit from it and post it here. Someone, with more knowledge of motor control circuitry than myself, may be able to advise you on how to test and repair the electronics

I don't mind a struggle

I'm not convinced I need to be looking at circuits and stuff though - this wasn't an issue with the old PSU, so it surely has to do with this new one? And they sent two, both of which give the same result, so it's fairly safe to assume it's not faulty.

Is there a reason the PSU itself would do this?

[WalterGibbons]

Originally Posted by Station X

I suggest you download the manual, extract the circuit from it and post it here. Someone, with more knowledge of motor control circuitry than myself, may be able to advise you on how to test and repair the electronics

Here's pretty much the complete manual, just in case!