According to the manufacturer, the reset procedure is documented here and on page 42 of the instruction manual:
http://faq.yamaha.com/us/en/article/musical-instruments/keyboards/digitalkeyboards/portable_keyboards/psr500/656/2085/psr500-psr500m_factory_reset_procedure
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While holding the uppermost white key, turn power on. Resets to default settings. This procedure also applies to the DGX-300, DGX-230, YPG-235, DGX-205, DGX-203, PSR-295, PSR-293, DGX-505, DGX-305, DGX-620, DGX-520, YPG-525, YPG-625, DGX-530, YPG-535, DGX-650, DGX-640
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