dual CS 522

twice the fun
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davewakey
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dual CS 522

Post by davewakey » 23 Jan 2020 21:21

I just noticed something odd, the turntable goes in reverse sometimes, anyone seen this before ?

dualcan
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Re: dual CS 522

Post by dualcan » 23 Jan 2020 23:42

Hi,
The 522 has the synchronous SM100 motor:
P1010083.jpeg
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These are the first non-induction motors from Dual for belt drive TT's.
With an induction motor, the motor will always turn in a predetermined direction because of the induction pole placement.
With a synchronous motor, there are many poles (16 in the case of the SM100). There are no mechanical provision on these types which direct the motor to start clock, or counterclockwise. To accomplish this, a capacitor is used. A capacitor is always ninety degrees out of phase voltage wise and this phase shift tells the motor in which direction to start.
For all Duals with the SM100 motor, there is a power box which contains the start switch and several capacitors and a resistor:
Defective condenserrs.JPG
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The resistor is used to switch the motor from 220 to 110 volts and almost never causes problems. The "direction finding" capacitor is the 0,33uF larger one. If that the SM100 has "direction amnesia", it must be changed.
As well, all the capacitors on that board are originally Rifa brand with safety factor of X2. All X2 Rifa units will have developed cracks in the plastic casings over age:
RIFA cracked.JPG
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With these cracks, humidity enters the "guts" of the capacitor and at a certain point, the humidity shortens out the cap which can cause it to explode, making a mess- but no fire- as X2 are designed not to burn.
If any crack is seen on any Rifa cap, it must be changed.
Although right now your problem is only the 0.33uF, it is advisable to change the two (sometimes three) capacitors on that board.
Check your local supply house for Rifa-Kemet capacitor for the values and voltages inscribed on the caps.
Regards,
k

davewakey
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Joined: 06 Jan 2020 16:15

Re: dual CS 522

Post by davewakey » 24 Jan 2020 13:42

I'm wondering if this turntable is worth putting the money into as it won't play in auto either, any thoughts ?

Tinkaroo
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Re: dual CS 522

Post by Tinkaroo » 24 Jan 2020 14:21

If you can do the work yourself then the parts are not expensive, plus you will learn some new skills you can be proud of.

davewakey
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Re: dual CS 522

Post by davewakey » 24 Jan 2020 21:09

Thanks I will give it a shot.

davewakey
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Joined: 06 Jan 2020 16:15

Re: dual CS 522

Post by davewakey » 24 Jan 2020 21:23

Would these have anything to do with the mechanical sequence of the table as it seems to have a mind of its own as to the record speed and record size and the arm movements. sometimes the needle touches down then returns, then repeats the process, I looked under the table and can't see any obvious mechanical problems with any of the arms, springs,cam, etc, very odd and frustrating.

davewakey
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Joined: 06 Jan 2020 16:15

Re: dual CS 522

Post by davewakey » 24 Jan 2020 21:36

I just watched a video on Youtube and it looks like I need something called a Stueuerpimpel as I know mine does'nt have one of these, probably explains the odd arm movements, does anyone know where I can get one ?, thanks.

Tinkaroo
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Re: dual CS 522

Post by Tinkaroo » 24 Jan 2020 21:48

davewakey wrote:
24 Jan 2020 21:36
I just watched a video on Youtube and it looks like I need something called a Stueuerpimpel as I know mine does'nt have one of these, probably explains the odd arm movements, does anyone know where I can get one ?, thanks.
Yes contact member mrow2 aka Don. He also includes a service guide in PDFs format with purchase.

dualcan
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Re: dual CS 522

Post by dualcan » 24 Jan 2020 21:59

Hi,
In Europe the clutch pimple is available from several sources. I have had good results with and use the pimple from this source:
https://schall-und-crema.webnode.com/dual-ersatzteile/
Although Oliver's site is in German, he speaks/writes in English and can be reached at:
O.Aichholz@web.de
Regards,
k

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