Tocadiscos Dual 1257

[Sambigote12345678]

Hola, tocadisco Dual 1257 gira en sentido contrario, por favor alguien me puede ayudar a como corregir esta falla?
Saludos.

[Jan7]

Basándome en esta respuesta -en inglés -

https://audiokarma.org/forums/index.php ... ap.811086/

https://organdonorparts.com/Dual-1257-T ... P480-7.htm

Creo que el problema puede estar en alguno de los condensadores de la fuente de alimentación esté defectuoso.

So I’ve decided to keep a Dual 1257 changer I picked up from GW. After a clean and lube, all functions work well. Speed direction is another issue, however; it will run backwards 1 time out of 5.

AK to the rescue: this is a motor recap issue, as found in a search. Indeed, one of my RIFA caps is cracked, so I will replace all three.

My question is do these caps show polarity? Looking at these, no obvious polarity to me...

Here is a pic of the caps:
B68E04F1-31C3-44B9-943D-CADC84768A51 by Mrv8q posted Feb 20, 2018 at 4:55 PM

Thanks in advance to get this little guy working great again!

From a previous post, here is a response to the needed caps:

Here is your answer. Underneath, remove the power supply cover (red lid). No need to remove the motor connections, the PC board pops loose for access.

There are 3 labeled film caps:

C1: .01uF, 250v
C2: .33uF, 250v
C3: .068uF, 250v

#2 is the one that is energized when you 1st turn it on and controls platter rotation direction. I changed it out and no more problem. But, I highly recommend that you change out all 3 (I did). 2 of the 3 were bad - only a matter of time before the 3rd one would go.

BTW, I used .047uF, 400v film caps for 1 & 3, and .39uF, 250v radial/mylar cap for 2 (stuff I had in stock). All functions are now normal.
Problem solved!

[AntonioII70]

Si, el fallo está en los condensadores.

Saludos.

[Sambigote12345678]

Gracias por la respuesta, voy a proceder a cambiar los condensadores.

[AntonioII70]

Aquí te indican unos equivalentes en tamaño:

https://www.vinylengine.com/turntable_f ... hp?t=54267