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ambroiseg
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Post subject: [LD-S2] Power supply issue Posted: 08 Jan 2021, 17:12 |
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Joined: 08 Mar 2020, 20:51 Posts: 10 Location: France Has thanked: 2 times Been thanked: 5 times
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Hi there, I'm Ambroise from Paris, and I had the chance to buy a not working LD S2 for a small price several days ago, and as I was suspecting, someone screwed up the transformers putting 230V instead of 110V... Anyway I'd like to install new transformers that can work with 230V, so I'm looking for secondaries voltages info : there is nothing in the service manual so I tried to guess with the schematics : VTT1075: 80VA (written on the transformer, confirmed by size) : 6-0-6V, 12-0-12V, 0-9V or 0-10V and 5-0-5V but not sure of the last two underlined parameters. I used the schematics but it's quite difficult to know. VTT1076 :20VA (idem) seems to be 0-9V and 0-9V because the power-on voltage (5V) is adding to this voltage once regulated. Could someone open his LD S2 and check the transformers secondaries voltages of these two transformers ? It can be done removing the bottom and you'll see 2 strips (CN311 & CN310) on a power board (with big capacitors : VWR1034) and one strip (CN405) on the board under the copper film near RCA audio outs. Thank you so much, and I know it will help some other guys worldwide Cheers ! Ambroise
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ambroiseg
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Post subject: Re: Power supply issue with a LD S2 Posted: 09 Jan 2021, 11:24 |
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Joined: 08 Mar 2020, 20:51 Posts: 10 Location: France Has thanked: 2 times Been thanked: 5 times
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Thank you for your answer, I though secondary output had to be under the regulated value as diode bridge give a higher DC voltage than AC, am I wrong ? I made a mistake because all my value have to be divided by 2 because of 0 connected to earth on symetrical supply : VTT1075 : CN310 : 3-0-3V=6Vac ->7Vdc 6-0-6V=12Vac->14Vdc CN311 : 0-12Vac -> 14dc and 12Vdc once regulated with Q22 So would you recommand to use higher voltages : 4-0-4V, 7-0-7V and 0-15V for example with standard value ? What could be FL ac voltage, I've no idea... that's a mystery and nothing is explained on the schematics... VTT1076 (audio transformer) : schematics p.67 but I'm a bit lost : it seems to be 0-6Vac and 0-10Vac in 2 diode bridges and a sum is made, or 0-20Vac, 0-20Vac divided then in +/-5Vdc and +/-14Vdc but I'm not sure : Attachment:
2021-01-09_11h19_59.png [ 117.35 KiB | Viewed 1328 times ]
The best would be someone measure it
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ambroiseg
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Post subject: Re: Power supply issue with a LD S2 Posted: 11 Jan 2021, 10:19 |
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Joined: 08 Mar 2020, 20:51 Posts: 10 Location: France Has thanked: 2 times Been thanked: 5 times
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Thank you, I contacted him and he seems to have the two transformers : I'll buy them or get the voltage infos and I'll share it here
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ambroiseg
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Post subject: Re: Power supply issue with a LD S2 Posted: 19 Jan 2021, 12:35 |
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Joined: 08 Mar 2020, 20:51 Posts: 10 Location: France Has thanked: 2 times Been thanked: 5 times
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Hi !
Good news : I received the two transformers : they seem to be the LD X1 versions because it's VTT1071 (audio) and VTT1077 (main). It is surely the same, anyway I took car because in Japan the mains voltage is 100V.
And so on a 100V transformers, without load :
VTT1071 : 17,7V & 17,7V
VTT1077: CN310 orange-brown : 7,9V brown-grey : 7,9V So 16V symetrical yellow-black : 13,7V black-red: 13,7V So nice 27V symetrical
CN311: red-purple: 14,3V green-white: 2,3V white-blue : 2,3V So 4,5V for FL AC
It couldn't be guessed easily !
Thank you for your help, I hope this can help someone to rebuild new transformers.
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