Thorens motor runs backwards! - Page 2 - diyAudio
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Old 16th September 2006, 11:28 AM   #11
AndrewT is offline AndrewT  Scotland
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Hi,
I don't think it is a start cap.

I think the synchronous motor is a two phase device that needs the leading phase from the cap connection as well as the standard phase from the direct connection. Then it runs.
But why backwards.
Could the connections into the two phases have been swapped? or would that cause backwards always?
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Old 16th September 2006, 01:33 PM   #12
lohk is offline lohk  Europe
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if one winding is broken or not connected, I sometimes just twiddles or sometimes run in both directions - by chance. I do not know why, but this happend to two decks already (which I had in repair). Both could only be cured with new motors.
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Old 16th September 2006, 01:35 PM   #13
lohk is offline lohk  Europe
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Well, I did not run in reverse - although I must have been funny- but the motors did... (sorry for the typo)
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Old 16th September 2006, 01:46 PM   #14
AndrewT is offline AndrewT  Scotland
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Hi,
a two phase motor with one phase disconnected will usually not start. If it does start it will run very rough and could go in either direction.
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Old 16th September 2006, 08:54 PM   #15
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sounds to me like the phases are out of alignment with each other. I think I'd go for the phase shift cap first. Its also very cheap fix! If you can't get a .22uF cap, then 2 x .1uF in parallel will do the job nicely.


Its not that big a deal, you can stop the platter and give it a shove in teh right direction and it will run. However, it would be very easy to drop the needle on the platter and not notice it was running in the wrong direction with doom ahead for the cart!

Fran
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Old 16th September 2006, 11:46 PM   #16
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OK, I looked in the PS box and all I could see was one square yellow cap...should I get the same type?

it doesn't seem to make a difference if I push it.
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Old 17th September 2006, 12:07 AM   #17
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yes, get the same value, type and rating.


Fran
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Old 19th September 2006, 04:29 PM   #18
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Just to let you know that I did a bit of looking at my ariston rd80sl last night and found that if I switched the motor pos leads around (i.e one goes through the capacitor, one straight from power in) I could make the motor always start in one direct or the other. It might be worth your while to try this too,


Fran
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Old 20th September 2006, 05:56 AM   #19
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Default Fixed prob accidently

Hi ... My situation is similar. I inavertantly wired my Thorens motor backwards, then the cap went out. Sounds great, now. Zene
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