Thorens TD 320 Power Supply

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I just got a TD 320 with no wall wart. I have been unable to find a stick replacement on the internet. I was wondering if anyone knows the specs on this item. AC or DC, Voltage, amperage?
Thanks
The wall wart (ac adaptor) looks like this from follow URL:
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/2lEAAOSwBLlVewz1/$_3.JPG
I have measured all voltages under the different modes (wall voltage was 233VAC).
1) off-mode: 18V6AC (same value also at disconnect AC plug)
2) ON, stop-mode: 18V0AC and 22V8DC behind rectifier
3) ON, play-mode: 16V5AC and 19V2DC behind rectifier (across the main capacitor 1000uF, 35V).
Now a question: For the motor control Unit No 214753 (PCB No 6 646 056) of the second version (Thorens TD320 MKII) I am looking for the schematic. This is different from the schematic of the first version - go to
Thorens TD320 Manual - 2-Speed Belt-Drive Turntable - Vinyl Engine
http://www.theanalogdept.com/images/spp6_pics/TT manuals/Thorens/TD3xxsvcman/3xx08.jpg
http://www.theanalogdept.com/images/spp6_pics/TT manuals/Thorens/TD3xxsvcman/3xx09.jpg
I need it to find out the reason for a burnt resistor, which is connected between the GND for motor control and the signal GND - go to
http://new-hifi-classic.de/Gallery/albums/userpics/normal_img_5401.jpg
and
http://new-hifi-classic.de/Gallery/albums/userpics/normal_img_5402.jpg
Who can upload the wanted schematic diagram ?
And what ist the actually aim of this resistor, which is not present at TD320' first version
Thank you very much.
 
Last edited:

Colehreed

Member
2018-01-20 3:07 am
Thorens TD320 Burnt Resistor

“I need it to find out the reason for a burnt resistor, which is connected between the GND for motor control and the signal GND - go to
http://new-hifi-classic.de/Gallery/albums/userpics/normal_img_5401.jpg

I’m curious if you ever figured out anything about this burnt resistor. I have the same pcb on my Thorens TD320 with the same burnt out resistor. I’m hoping I can replace it but I can’t find any information. I picked up this TT at a garage sale very cheap and in poor shape, but I like a challenge. Any help would be appreciated.
 

msdin

Member
2006-09-09 11:46 pm
The resistor looks to be 100R.
 

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elwood625

Member
Paid Member
2013-01-30 4:15 pm
Elkhart Lake, WI
I have owned a Thorens TD-321 since I bought it new in 1984. The 321 is the version without a tonearm. I also have a TD-320 MK3 for the past 5 years. They use a 16vac wall wart. I upgraded to a GBC rated at 1.25A instead of the original 100mA version with no problems. I bought them at American Science and Surplus in Geneva, IL. They cost $4.50 each, they have 1A and 1.25A versions.
American Science and Surplus


It sounds like the resistor issue is caused by to high of voltage for the wall wart.
 

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adelcura

Member
2018-12-20 6:38 am
I have owned a Thorens TD-321 since I bought it new in 1984. The 321 is the version without a tonearm. I also have a TD-320 MK3 for the past 5 years. They use a 16vac wall wart. I upgraded to a GBC rated at 1.25A instead of the original 100mA version with no problems. I bought them at American Science and Surplus in Geneva, IL. They cost $4.50 each, they have 1A and 1.25A versions.
American Science and Surplus


It sounds like the resistor issue is caused by to high of voltage for the wall wart.


Thanks for answering elwood, but I have the same problem than tiefbassuebertr in this post.

I have the same burnt resistor in my board and the TT doesn't work. I changed it but nothing happens.
 

elwood625

Member
Paid Member
2013-01-30 4:15 pm
Elkhart Lake, WI
Actually it improved the speed variations that the speed control could not handle on my TD -321 MK2. I did need to readjust the 33 and 45 rpm speeds using the two pots on the speed control board. Now both 33 and 45 rpm are dead stable.
The TD-320 MK3 uses a 24 pole motor with improved speed control, the updated wall wart was only helpful when the local mains were fluctuating. I live a mile away from Fermi Lab, when they fire up the light dim.
 

elwood625

Member
Paid Member
2013-01-30 4:15 pm
Elkhart Lake, WI
TD-320 info

adelcura - Here is info from my TD-320 Service manual. If your turntable has the Thorens arm, it has an auto shut off feature, this is the first page, the other two pages give electrical info and test point values.
 

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elwood625

Member
Paid Member
2013-01-30 4:15 pm
Elkhart Lake, WI
TD 320 scematics

Here are the two different schematics for the speed control unit and PC boards, you will need to match the schematic to your speed control.
I hope this helps you, these are outstanding turntables which will match almost any current VPI and are certainly better than any REGA, I know, I have a P8 with the NEO speed control.
 

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