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Japanese Toshiba


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#1 Cypher

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Posted 14 February 2011 - 11:59 PM

So i have a Japanese model Toshiba that i cant use with standard U.S outlet. Is there something i can use to power it up and not damage it except for those big box step down converters?

#2 baddboybill

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Posted 15 February 2011 - 12:04 AM

So i have a Japanese model Toshiba that i cant use with standard U.S outlet. Is there something i can use to power it up and not damage it except for those big box step down converters?

Some Toshibas have a slide switch as part of the plug.. you may have to slide up or down... ;-)

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#3 Cypher

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Posted 15 February 2011 - 09:26 PM

Its a Toshiba RTS 90. This one
http://stereo80s.com/bbx.cfm?id=799

#4 Superduper

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Posted 15 February 2011 - 09:34 PM

That's a 100v only boombox -- no voltage adjustments possible. When used on our USA mains, the resulting voltage output to the boombox increases by 25% That means if the normal voltage seen by the boombox when powered on mains is 18volts (about normal) using 100v mains, it is possible to see close to 23 volts at the boombox when plugged into 125v mains. There is an element of risk in using it like that but the only way to retrofit it properly is to install a new transformer or use a step down external transformer. Most people I know will use the boombox like that, as is.

Many parts of an electronic design that is extremely voltage sensitive might be regulated to a particular voltage by some form of voltage regulating component or circuitry. The higher the non-regulated voltage vs regulated voltage, the higher the amount of power sinked by that regulator. Sustained operation increases the risk that the regulator can fail. Therefore, it would not suprise me if failure rates for boomboxes used on USA voltage (when said boombox was initially designed for japan voltage) is higher than normal.

#5 baddboybill

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Posted 15 February 2011 - 10:07 PM

I would not use it for anything else but what it states...Norm is right about changing out transformer or step down transformer :-O :hmmm:

#6 Cypher

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Posted 15 February 2011 - 10:20 PM

Would it be something like this?
http://cgi.ebay.com/... ... 5642946534

#7 Superduper

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Posted 15 February 2011 - 10:31 PM

NO. That transformer steps 220v down to 110v. You need something that will step 120v down to 100v. It's not a common version since the only country that uses 100 volts is japan (that I know of). The more prevalent voltages are 110/120/220/240.

#8 TW5

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Posted 15 February 2011 - 10:51 PM

Heres a trick to reduce the voltage using a transformer.
Connecting the 24 volt out backwards to subtract voltage from the 120 volts AC.
Will give you close to 100 volt needed.



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#9 Cypher

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Posted 15 February 2011 - 11:53 PM

damn this is confusing

#10 baddboybill

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Posted 16 February 2011 - 12:05 AM

try this :-D
http://international... ... ormer.html

#11 Cypher

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Posted 16 February 2011 - 09:12 PM

try this :-D
http://international... ... ormer.html

is there anything smaller and not as bulky?

#12 Superduper

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Posted 16 February 2011 - 09:29 PM

Yes, a 12 to 15 volt wall wart, like I said before.

Come'on... let's not be too picky now, shall we? This one is only 100 watts. Any smaller won't be much use. Considering that you're using a boombox intended for the japanese market, this is a good compromise. Either that or replace the internal transformer for one better suited to our USA voltages.

#13 Cypher

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Posted 16 February 2011 - 10:32 PM

Yes, a 12 to 15 volt wall wart, like I said before.

Come'on... let's not be too picky now, shall we? This one is only 100 watts. Any smaller won't be much use. Considering that you're using a boombox intended for the japanese market, this is a good compromise. Either that or replace the internal transformer for one better suited to our USA voltages.

Any idea on what boombox's tranformer i can swap it with? Can it be with any US rated transformer?

#14 Cypher

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Posted 03 March 2011 - 12:08 AM

???

#15 Fatdog

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Posted 03 March 2011 - 01:05 AM

Both redbenjoe and MONOLITHIC have that same Toshiba. Maybe PM them and ask what they do. I'm thinking you could get a similar transformer from another Toshiba. The question still remains - which one? :-/

#16 redbenjoe

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Posted 03 March 2011 - 01:35 AM

3 good choices:

1. use batteries
2. the 12-15 v wall-wart
3. the 120>100 step-down unit

all with no need to alter your OEM s90 power supply

s0 --
dont let the 100 v bit stop you from buying this GREAT box :-) :thumbsup:

#17 Superduper

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Posted 03 March 2011 - 02:33 AM

???


It not that we don't want to answer with such specifics, but swapping an internal transformer for a properly spec'd new one is something that anyone familiar with electronics should be able to do, by simply calculating the power consumption (it states right on the back of the boombox on data spec markings), and the desired voltage output of new transformer. So many new transformer choices from so many manufacturers from so many distributors.......

Then you'll need to physically measure the space available, the mounting screw spacing, etc. etc. YOU must do that since the S90 isn't really a common boombox as it was never introduced in the USA. You can't really expect someone else to go through all that trouble of taking apart their boombox to do all the legwork for you. Comparing the aforementioned data collected with the datasheet of the new products is the way to choose an appropriate one.

Finally, unlike low voltage applications (12v, 15v, etc.) transformers are high voltage devices with lethal potential. NO ONE unfamiliar with electronic basics should attempt to work on that portion of an electronic device unless they are familiar with such projects for reasons of safety.

Since it really sounds like you need a lot of guidance here and not that familiar with electronics, it's best that you simply use the appropriate adapter options already recommended and mentioned elsewhere in this thread rather than pursue replacing the transformer unless you intend to farm the work out to a professional. From the factory, almost all boombox power supplies insulate the primaries so all exposed metal within the boombox is low secondary voltage only. This is for safety reasons. Otherwise, a grounding plug would be required. If you don't know what you are doing, it is possible to circumvent those safeguards that were built into the boombox and the device might appear to work fine but can introduce potentially dangerous conditions for you or future owners of the boombox.

There is one more option which will work for you but since you already sound lost with a transformer replacement, which is about as simple of an electronics upgrade as can be -- it wouldn't interest you. But rather than replace the transformer (which would output more voltage than intended due to higher than intended voltage IN), it is possible to build and insert additional circuitry between the transformer and the mainboard. I'm talking about a voltage regulator circuit which will "regulate" the higher voltage to the desired 15 volts that the boombox wants. However, like I said, this would be even more complicated than replacing the transformer.

#18 devol-toni

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Posted 03 March 2011 - 06:01 AM

It not that we don't want to answer with such specifics, but swapping an internal transformer for a properly spec'd new one is something that anyone familiar with electronics should be able to do, by simply calculating the power consumption (it states right on the back of the boombox on data spec markings), and the desired voltage output of new transformer. So many new transformer choices from so many manufacturers from so many distributors.......

Then you'll need to physically measure the space available, the mounting screw spacing, etc. etc. YOU must do that since the S90 isn't really a common boombox as it was never introduced in the USA. You can't really expect someone else to go through all that trouble of taking apart their boombox to do all the legwork for you. Comparing the aforementioned data collected with the datasheet of the new products is the way to choose an appropriate one.

Finally, unlike low voltage applications (12v, 15v, etc.) transformers are high voltage devices with lethal potential. NO ONE unfamiliar with electronic basics should attempt to work on that portion of an electronic device unless they are familiar with such projects for reasons of safety.

Since it really sounds like you need a lot of guidance here and not that familiar with electronics, it's best that you simply use the appropriate adapter options already recommended and mentioned elsewhere in this thread rather than pursue replacing the transformer unless you intend to farm the work out to a professional. From the factory, almost all boombox power supplies insulate the primaries so all exposed metal within the boombox is low secondary voltage only. This is for safety reasons. Otherwise, a grounding plug would be required. If you don't know what you are doing, it is possible to circumvent those safeguards that were built into the boombox and the device might appear to work fine but can introduce potentially dangerous conditions for you or future owners of the boombox.

There is one more option which will work for you but since you already sound lost with a transformer replacement, which is about as simple of an electronics upgrade as can be -- it wouldn't interest you. But rather than replace the transformer (which would output more voltage than intended due to higher than intended voltage IN), it is possible to build and insert additional circuitry between the transformer and the mainboard. I'm talking about a voltage regulator circuit which will "regulate" the higher voltage to the desired 15 volts that the boombox wants. However, like I said, this would be even more complicated than replacing the transformer.


Norm, this reasonable answer must be archived for the future generations :yes:
And Cypher, please, leave the Toshiba in its original state.
Just by that external step down transformer and enjoy on that beautiful Toshiba . :yes:

#19 monchito

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Posted 03 March 2011 - 10:18 AM

:agree: unless like norm said you know electronics very well then your best bet is too use a adapter :yes: :yes: :yes:
http://www.voltageco....com/index.html


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please check this out it only cost 17.99

#20 Sazeus

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Posted 03 December 2012 - 01:40 AM

I'm glad I stumbled across this. Very good to know, thanks.

#21 Reli

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Posted 03 December 2012 - 12:45 PM

LiteFuze convertingbox. Best quality bang for the buck.