Owner's Manual
Page 117
... the product, an authorized service center, or to Yamaha with an explanation of products: PSR SERIES OF PORTATONE ELECTRONIC KEYBOARDS If during the first 90 days that immediately follows the purchase date, your new Yamaha product covered by Yamaha to sell these parts without prior authorization. Your owners... to have been altered, defaced, exchanged removed, or to failures and/or damages that will be prepared to provide proof purchase date (sales receipt, credit card copy, etc.) when requesting service and/or parts under warranty to: the retailer selling the product, or any other...
... the product, an authorized service center, or to Yamaha with an explanation of products: PSR SERIES OF PORTATONE ELECTRONIC KEYBOARDS If during the first 90 days that immediately follows the purchase date, your new Yamaha product covered by Yamaha to sell these parts without prior authorization. Your owners... to have been altered, defaced, exchanged removed, or to failures and/or damages that will be prepared to provide proof purchase date (sales receipt, credit card copy, etc.) when requesting service and/or parts under warranty to: the retailer selling the product, or any other...