Sony PS-X70 dead motor pole? - diyAudio
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Old 31st October 2007, 12:28 AM   #1
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Default Sony PS-X70 dead motor pole?

I have 2 Sony PS-X70 direct drive Turntables and both exhibit the same behavior. The platter motors run but, they do not start from a dead stop at all platter positions. I can start the table with the platter at one position but if I turn the platter 90 degrees, it won't start without a push. One table I have had for several years and the other I bought for parts on Ebay. Both have the same problem. Where do I start to solve the problem with these turntables???
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Old 31st October 2007, 02:37 AM   #2
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Possibly one of the Hall effect position sensors is dead so that in some positions the table doesn't know where the platter is. Your chances of fixing this are very slim, declining to nearly zero if you don't have the service manual.
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Old 31st October 2007, 03:27 AM   #3
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Does this model have those wire-wrapped connectors on the boards? If so, first thing I'd be doing is to make sure they're well-soldered. Those connections will have oxidized over the years.

I did this with my PS-X6, the earlier generation, and most any 70's vintage amp I see.

It may not be the answer to your problem, but it will eliminate one source.

Cheers,

David
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Old 5th November 2007, 08:32 AM   #4
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U should be able to find the faulty hall sensor and replace it.
There will be at least three of them. So compare their output pins by rotating the motor manually, so that the sensors get activated.

When the magnet pole reaches the sensor, it will change the output. What pole the sensor senses, depends on its design. Some sense only north or south magnet pole and others sense both.

Gajanan Phadte
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Old 5th November 2007, 08:58 AM   #5
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You might be able to find a suitable hall-effect sensor from an old VCR head motor,or an old floppy drive spindle motor,if you can't source a new one from Digikey,etc.
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Old 5th November 2007, 09:12 AM   #6
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U can get replacement parts from the second unit.

Gajanan Phadte
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