Http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail.html?CNTID=2117&CTID=205200
http://www.electronicsrepair.net/rec23psr.shtml
http://www2.yamaha.co.jp/manual/pdf/emi/english/port/PSRGX76E.pdf
Download these manuals above they will assist you in repairing.
Ok, well the first place to start is ALWAYS is the Power Supply, so you must check this and see if the Voltages are correct, if this uses an AC/DC Wall adapter, then, check this, you may need a multimeter, set to DC Volts, to do so. If it is OK, then check, inside, from the Power IN socket and work inwards, It may even be a Blown Fuse, DO NOT simply ever just replace a fuse 99 times out of 100, the fuse blows due to a short circuit, or a massive overload, if you do not, Find and Fix, what caused it to blow in the first place, then it will simply blow again. To do any sort of repair to anything electrical or electronic, except for perhaps the most rudimentary of ones, then one MUST have a Service manual, for the exact unit you are working on. There is simply no way of knowing what part numbers are to order any parts maybe needed. Voltages, test & Diagnostic procedures.
It is my professional opinion though that everyone should take their units to their manufacturers approved service center, contacting a local head office, of your unit & getting an approved service center is just SO important, even worth the extra to ship it, you see, at those places, the Engineers, are trained on the equipment you have, they usually have parts on hand, and do the job quicker. Anyway do that and get a "Quote". This way, at least, you'll know whether to repair or replace.
I see items like this in my shop from time to time, and mostly they are easy and cheap to repair, they are made extremely well, and unless a power strike, spike, surge etc, or physical damage, they normally are very reliable, also usually it is something to do with the power.
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