Sony PS T22 - UK Vintage Radio Repair and Restoration Discussion Forum

112stereo · 8th Jan 2020, 5:44 pm

Can anyone help please ?
My son in law acquired a sony pst22 record deck over Christmas at a car boot sale, it was supposed to be working. To a point it does but it runs fast.
Had a look on various forums and found a few pointers, but none seem to work.
Cleaned the pitch control and associated pots all appear to work, but they won't slow it down far enough.
There is a circuit board for the servo with various pots on it, but they don't say what they do so I am reluctant to touch them.
Does anyone have a knowledge of this board or better still a circuit cot it ?
I have a service manual and it shows the board but not how to set it up !
Any ideas would be appreciated.

kevinaston1 · 8th Jan 2020, 5:57 pm

Service manual available at vinylengine, you need to register (free) to download it.

112stereo · 8th Jan 2020, 7:12 pm

Thank you, this is the one I have and the only adjustment it shows is the speed detecting head output level adjustment.
This is correct, but there are a further 7 pots that can be adjusted and there is no information on these at all.
The pitch control works but not enough to make the lines on the turntable static.
I don't have a scope only a multimeter.
It could be a fault, caps, or any other components but without a circuit I am in the dark !

John123 · 8th Jan 2020, 8:04 pm

If it's anything like my PS-6750, there should be two preset pots for 33 and 45 indicated underneath the deck, and adjustable with a small Philips through the casing.

tri-comp · 9th Jan 2020, 12:47 am

The PS-T22 manual on Vinylengine obviously is only partial, missing actually the most important parts, like a schematic diagram and the instructions for adjustment.
Since the Japanese producers liked to make equipment i number-related series, so is the case with this turntable/record deck.
Find another model with a corresponding typeno. and you could be in luck to find it's quite similar.
A corresponding no. to be expected in this series would be perhaps PS-T11. Cheaper model with less features, not the direction to go.
(There isn't really a Sony PS-T11 so just to make an example)
Then there's the possibility of a PS-T33 which would have been an upgrade, more expensive model.
Perhaps fully automatic as opposed to semi-automatic or something else, but still very similar.
The theory actually seems to hold in this case.
Take a look at the full PS-T33 service-manual available for free here:
https://freeservicemanuals.info/en/s...al/Sony/PST33/
Good luck with repairs. I would start by replacing all electrolytic capacitors BEFORE fiddling with the pot's.

/Torben

112stereo · 9th Jan 2020, 6:17 pm

Thank you.
So far I have found 6 variations of the pcb, I have never seen so many board variations as Sony have put in their decks for the same motor.
It's going to take time to go through them and see which is the nearest to mine.
There is even one for sale on eBay that's different again from mine yet from the same model.

112stereo · 19th Jan 2020, 1:55 pm

Just to finalise, there was a control pot open circuit.
Managed to adjust to correct speed with the bars in the turntable all good finally.
Just wish I had a sheet with the set up procedure then I would be happy.
Many thanks for all your assistance.

8th Jan 2020, 5:44 pm	#1
112stereo Pentode Join Date: Jan 2014 Location: St Albans, Hertfordshire, UK. Posts: 215	Sony PS T22 Can anyone help please ? My son in law acquired a sony pst22 record deck over Christmas at a car boot sale, it was supposed to be working. To a point it does but it runs fast. Had a look on various forums and found a few pointers, but none seem to work. Cleaned the pitch control and associated pots all appear to work, but they won't slow it down far enough. There is a circuit board for the servo with various pots on it, but they don't say what they do so I am reluctant to touch them. Does anyone have a knowledge of this board or better still a circuit cot it ? I have a service manual and it shows the board but not how to set it up ! Any ideas would be appreciated. Attached Thumbnails

8th Jan 2020, 5:57 pm	#2
kevinaston1 Hexode Join Date: Aug 2014 Location: Featherstone, West Yorkshire, UK. Posts: 386	Re: Sony PS T22 Service manual available at vinylengine, you need to register (free) to download it.

8th Jan 2020, 7:12 pm	#3
112stereo Pentode Join Date: Jan 2014 Location: St Albans, Hertfordshire, UK. Posts: 215	Re: Sony PS T22 Thank you, this is the one I have and the only adjustment it shows is the speed detecting head output level adjustment. This is correct, but there are a further 7 pots that can be adjusted and there is no information on these at all. The pitch control works but not enough to make the lines on the turntable static. I don't have a scope only a multimeter. It could be a fault, caps, or any other components but without a circuit I am in the dark !

8th Jan 2020, 8:04 pm	#4
John123 Heptode Join Date: Jan 2007 Location: Luton, Bedfordshire, UK. Posts: 891	Re: Sony PS T22 If it's anything like my PS-6750, there should be two preset pots for 33 and 45 indicated underneath the deck, and adjustable with a small Philips through the casing. __________________ Regards, John

9th Jan 2020, 12:47 am	#5
tri-comp Heptode Join Date: Oct 2008 Location: Aalborg, Denmark Posts: 903	Re: Sony PS T22 The PS-T22 manual on Vinylengine obviously is only partial, missing actually the most important parts, like a schematic diagram and the instructions for adjustment. Since the Japanese producers liked to make equipment i number-related series, so is the case with this turntable/record deck. Find another model with a corresponding typeno. and you could be in luck to find it's quite similar. A corresponding no. to be expected in this series would be perhaps PS-T11. Cheaper model with less features, not the direction to go. (There isn't really a Sony PS-T11 so just to make an example) Then there's the possibility of a PS-T33 which would have been an upgrade, more expensive model. Perhaps fully automatic as opposed to semi-automatic or something else, but still very similar. The theory actually seems to hold in this case. Take a look at the full PS-T33 service-manual available for free here: https://freeservicemanuals.info/en/s...al/Sony/PST33/ Good luck with repairs. I would start by replacing all electrolytic capacitors BEFORE fiddling with the pot's. /Torben

9th Jan 2020, 6:17 pm	#6
112stereo Pentode Join Date: Jan 2014 Location: St Albans, Hertfordshire, UK. Posts: 215	Re: Sony PS T22 Thank you. So far I have found 6 variations of the pcb, I have never seen so many board variations as Sony have put in their decks for the same motor. It's going to take time to go through them and see which is the nearest to mine. There is even one for sale on eBay that's different again from mine yet from the same model.

19th Jan 2020, 1:55 pm	#7
112stereo Pentode Join Date: Jan 2014 Location: St Albans, Hertfordshire, UK. Posts: 215	Re: Sony PS T22 Just to finalise, there was a control pot open circuit. Managed to adjust to correct speed with the bars in the turntable all good finally. Just wish I had a sheet with the set up procedure then I would be happy. Many thanks for all your assistance.