Yamaha CK88 Owner's Manual page 77

Important Notice:
U.S. LIMITED WARRANTY for Customers in the United States
For detailed information about this Yamaha product and warranty service, please either
visit the following website address (printable file is available at our website) or contact
Customer Service at the address or telephone number identified below.
Website Address:
Yamaha.io/SynthAndStageWarranty
Customer Service:
Yamaha Corporation of America
6600 Orangethorpe Avenue, Buena Park, CA 90620-1273
Telephone: 800-854-1569