Yamaha TX802 Powering Questions

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Yamaha TX802 Powering Questions

Postby Echase409 » Mon Nov 20, 2017 10:15 pm

Hi everyone!

I recently bought a Yamaha TX802 (rack version of the DX7 mkII) on eBay from a dealer in Japan. This is my first vintage hardware purchase so I'm super excited. My question is concerning the appropriate way to power the synth. Since it is from Japan, it uses the Japanese 100V powering system instead of the American 110/120V system. I did some researching and found that I will need a power transformer to safely power the synth. Now I just need to choose the wattage of the power transformer (they range from 100W to 1000W). I was going to make this decision based off of the wattage of the TX802, but can't find how many watts it produces. On the back panel it reads:

"100V 8W 50/60Hz"

I'm assuming it needs way more than 8W to operate, considering that 8W isn't even enough to power a cellphone charger :lol: I know it is possible to calculate wattage using this formula:

Volts * Amps = Watts

But I don't know how many amps a TX802 has, and I don't think using the 8W as the actual wattage is going to give me accurate results. Any information or suggestions would be greatly appreciated!

Thanks for looking,
Ed
Last edited by Echase409 on Sun Dec 10, 2017 8:28 pm, edited 1 time in total.
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Re: Yamaha TX802 Powering Questions

Postby micahjonhughes » Mon Nov 20, 2017 10:42 pm

Nice synth.

The manual says 15W.

You will be safe at 100W rating on the transformer.


(Cell phone charges generally kick out 5 volts. So, 5 volts at 1amp would be 5W.)
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Re: Yamaha TX802 Powering Questions

Postby Echase409 » Mon Nov 20, 2017 11:18 pm

micahjonhughes wrote:Nice synth.

The manual says 15W.

You will be safe at 100W rating on the transformer.


(Cell phone charges generally kick out 5 volts. So, 5 volts at 1amp would be 5W.)


Thanks Micah! I appreciate the quick response. Not that I don't believe you, but on what page did you find where it says 15W? I scoured the manual pretty hard but didn't find any information about its wattage/power output. But its totally possible that I could have overlooked it! I looked at both the Owners manual and Service manual on manualslib.com
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Re: Yamaha TX802 Powering Questions

Postby Echase409 » Mon Nov 20, 2017 11:22 pm

Never mind, Micah. I see where you found it. My apologies :lol: :roll:
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Yamaha TX802/816

Postby Bernd » Wed Dec 20, 2017 6:44 am

hello ,does anybody have schematics to the TX802/816 espacially the TF1 ,because i´ve one modul dying complete and don´t have the suport to power up .... :?: :(
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