Hi Bernie,

[FUNCTION] → UTILITY → SYSTEM RESET display.

The owner's manual explains several kinds of resets on Page 196, and it can be downloaded at this page.

http://www.yamaha.co.jp/manual/english/index.php

Just enter Tyros2 in the Model Name Search box and select owner's manual.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.