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 Post subject: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 4:38 pm 
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Hi I have bought a Sony ST-80F TUNER as I had one years ago but the one I have bought says input 117volts ac and as I am in a country (Ireland) which runs off 220 volts ac, can any body advise me how to make the unit run off 220volts ac, regards Antique1


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 6:00 pm 
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Location: Ohio 45177
I found a schematic online that shows a "voltage changeover block" inside that unit, but does not show exactly what the jumpers are inside the "box" However it shows the line input and two transformer primaries that presumably can be connected as either 120V or 220. I will describe the connections here as I cannot attach the schematic.
Terminals on the voltage changeover are thus:

1. 120V
2. 100V tap
3. 0V. These 3 are shown as an isolated primary winding.
4. 120V
5. 100V tap
6. 0V 4,5,6 is shown as the second identical isolated primary winding.
7&8. Line AC input to block.

Thus it would appear that if you connected line input to 1&6, and connected 3 to 4, it would be 240V. For 220 you would have to connect 120V winding in series with a 100V tap so perhaps 3 to 5 and line to 1 and 6. Otherwise a smallish 220 to 120 stepdown transformer externally would function as I suspect the power consumption of the unit is not very great. Data plate on back says only 13 watts. Since you can see the insides of the unit yourself, you can perhaps discern how to connect things and what the jumpers are.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 7:42 pm 
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Instead of going through all that, just buy a 220/110 volt converter off Amazon;
https://www.amazon.com/Mimgo-Store-Conv ... +converter

You might also need a converter for the pins;
https://www.amazon.com/Ckitze-Europe-Ro ... +converter

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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 9:01 pm 
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Yea, well sometimes those mains select jumper boards have easy peasy push on terminals that requires only the removal of jumpers and/or repositioning of the wire connections. If you can puzzle out which goes where, with confidence, you spend nothing. IF it is more complicated than that, maybe soldering and such, or unmarked connections, the alternative seems safer if an added encumbrance.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 9:27 pm 
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Location: Mountains of Mourne. Ireland.
If it's this USA model, you will need a step-down voltage (converter) transformer UK 240v to US 120v
https://i.ebayimg.com/images/g/YDQAAOSw ... -l1600.jpg

If it's this UK/European model... and currently set for 117v
https://i.ebayimg.com/images/g/GGEAAOSw ... -l1600.jpg
as Wazz has already stated, it can be changed over internally.

Greg.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 10:18 pm 
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OK I found that picture of the back with the different voltages listed but I did not see the picture of the one that seems to be 117 only? The radiomuseum schematic showed a resistance to the case in the US and Canadian versions from the AC line but the schematic did not have a note that the voltage select ability was for just Europe. Could be. But a stepdown transformer for a 13 watt device ought not be very large. He will need to tell us exactly what he has for us to advise further.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 10:26 pm 
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IT would appear the Chinese have attacked the problem with their own economically priced converters. https://www.ebay.com/itm/50-Watts-Delux ... 5177!US!-1 "Up to 50 watts" showing that perhaps a great deal of money need not be spent for a device to satisfy the need. However I assume this device is not merely a transformer and despite the "radio" qualification in the listing, it may create noises. Even ones that appear to be low power true transformers are not terribly expensive. The cost issue seems to be when you need a substantial transformer for a larger appliance.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Wed 13, 2018 11:06 pm 
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Location: Mountains of Mourne. Ireland.
These are OK and usually go for $20.00 or $30.00US
https://www.ebay.co.uk/sch/i.html?_from ... 6&_sacat=0
sure, it's overrated for this application... :)

Those little travel/wall-warts are good for target practice... :shock:

Greg.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Thu 14, 2018 12:35 am 
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Location: Mountains of Mourne. Ireland.
If it is this model...
Image

then this applies
Image
Original service manual SONY ST-80F 27.8MB
https://freeservicemanuals.info/en/serv ... ony/ST80F/ ←thanks to Wil Manshande in Holland... :)

Greg.


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Thu 14, 2018 1:13 am 
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Well that is not quite the same as the radiomuseum schematic indications of numbering the wires connections, but since it is specific and shows the layout, I guess that is a better reference! Say, what happened to OP?


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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Thu 14, 2018 11:43 am 
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wazz wrote:
Well... Say, what happened to OP?


Might be in bed. Remember that Ireland is several hours ahead of us in the US. But more importantly, thanks for helping our friend across the pond.

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 Post subject: Re: Sony ST-80F Tuner
PostPosted: Jun Sun 17, 2018 12:43 am 
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Japanese domestic line voltage is 100 volts (instead or 120-240-480, it's 100-200-380). Most of what they built for export is multi-voltage capable because of this. I work for Bridgestone-Firestone and a lot of our lab equipment sent from Japan was not built for export, so every machine has its own 120 to 100 volt step-down transformer.

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"If it doesn't fit, force it. If it breaks, it needed replaced anyways."


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