The Yamaha AN1x Synthesizer mailing list

there's a hidden 'test' mode in the AN1x, intended for factory and servicing use only. You enter it by powering up the synth whilst holding down the '0', '-' and '+' buttons on the keypad. The '+' button then advances through the tests, and the '-' button goes back. The 'Store' button enters a test routine and acts as the 'Yes' button, whilst the 'Portamento' button exits a test and doubles as the 'No' button. 
anyone tryed this???