Sony PS-X70 dead motor pole?

Don Nebel · 31st October 2007, 12:28 AM

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???

Mark Kelly · 31st October 2007, 02:37 AM

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.

doodlebugs · 31st October 2007, 03:27 AM

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

gmphadte · 5th November 2007, 08:32 AM

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

DigitalJunkie · 5th November 2007, 08:58 AM

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.

gmphadte · 5th November 2007, 09:12 AM

U can get replacement parts from the second unit.

Gajanan Phadte

31st October 2007, 12:28 AM	#1
Don Nebel diyAudio Member Join Date: Jan 2006 Location: Kentucky	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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31st October 2007, 02:37 AM	#2
Mark Kelly diyAudio Member Join Date: Feb 2006 Location: Geelong	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.

31st October 2007, 03:27 AM	#3
doodlebugs diyAudio Member Join Date: Jan 2007	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

5th November 2007, 08:32 AM	#4
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	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

5th November 2007, 08:58 AM	#5
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	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.

5th November 2007, 09:12 AM	#6
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	U can get replacement parts from the second unit. Gajanan Phadte