Sony HMK 70 help needed - UK Vintage Radio Repair and Restoration Discussion Forum

Matthew D · 31st Aug 2019, 1:07 pm

Hi, I wonder if anyone could give me some advice of how to reset the mechanism of my Sony HMK 70. I purchased it from a charity who advertised it on line and insisted on posting it. When it arrived the Plato had come off its location point, I replaced it but it makes contact with the base of the turntable. The centre spindle lifts up and down and when I look at the mechanism I can sort of work out how it works, the Plato will turn then the spindle drops down making the Plato catch the base.

Am I missing something silly ?

Any help would be much appreciated

Regards, Matthew.

ms660 · 31st Aug 2019, 1:47 pm

https://www.vintage-radio.net/forum/...d.php?t=141377

?

Lawrence.

Marconi_MPT4 · 31st Aug 2019, 1:53 pm

Hi Matthew, welcome to the forum.

A common problem is failure of the lower bearing thrust washer which supports the turntable shaft and results in the turntable almost touching the deck.

Attached link to an older thread showing bearing location.

https://www.vintage-radio.net/forum/...59&postcount=3

Well worth fixing but can you confirm if the thrust washer has failed?

Rich

Matthew D · 31st Aug 2019, 2:55 pm

Hi Rich, thanks for your reply and guidance. What I can't work out is why the centre spindle teeth are below the point that's required for them to make contact with the teeth on the large white disk with teeth, excuse my lamen terms, I don't know the correct names for the parts. How does the splindle lift in order to make contact ?
Regards
Matthew

31st Aug 2019, 1:07 pm	#1
Matthew D Retired Dormant Member Join Date: Aug 2019 Location: Barnsley, South Yorkshire, UK. Posts: 2	Sony HMK 70 help needed Hi, I wonder if anyone could give me some advice of how to reset the mechanism of my Sony HMK 70. I purchased it from a charity who advertised it on line and insisted on posting it. When it arrived the Plato had come off its location point, I replaced it but it makes contact with the base of the turntable. The centre spindle lifts up and down and when I look at the mechanism I can sort of work out how it works, the Plato will turn then the spindle drops down making the Plato catch the base. Am I missing something silly ? Any help would be much appreciated Regards, Matthew.

31st Aug 2019, 1:47 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Sony HMK 70 help needed https://www.vintage-radio.net/forum/...d.php?t=141377 ? Lawrence.

31st Aug 2019, 1:53 pm	#3
Marconi_MPT4 Heptode Join Date: Mar 2011 Location: Dorset, UK. Posts: 522	Re: Sony HMK 70 help needed Hi Matthew, welcome to the forum. A common problem is failure of the lower bearing thrust washer which supports the turntable shaft and results in the turntable almost touching the deck. Attached link to an older thread showing bearing location. https://www.vintage-radio.net/forum/...59&postcount=3 Well worth fixing but can you confirm if the thrust washer has failed? Rich __________________ To an optimist a glass is half full; a pessimist half empty; an engineer twice as big as need be!

31st Aug 2019, 2:55 pm	#4
Matthew D Retired Dormant Member Join Date: Aug 2019 Location: Barnsley, South Yorkshire, UK. Posts: 2	Re: Sony HMK 70 help needed Hi Rich, thanks for your reply and guidance. What I can't work out is why the centre spindle teeth are below the point that's required for them to make contact with the teeth on the large white disk with teeth, excuse my lamen terms, I don't know the correct names for the parts. How does the splindle lift in order to make contact ? Regards Matthew